[WIP][Base] Use variadic template for Callback and Bind

base/bind_internal.h

Index: base/bind_internal.h
diff --git a/base/bind_internal.h b/base/bind_internal.h
index ae17ebf86c1a6c17f3a6cb5108a10d690ad4be61..0babb6627cc06088dd9b4879b0023f8296d284fe 100644
--- a/base/bind_internal.h
+++ b/base/bind_internal.h
@@ -1,8 +1,3 @@
-// This file was GENERATED by command:
-//     pump.py bind_internal.h.pump
-// DO NOT EDIT BY HAND!!!
-
-
 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
@@ -12,6 +7,7 @@
 
 #include "base/bind_helpers.h"
 #include "base/callback_internal.h"
+#include "base/callback_tuple.h"
 #include "base/memory/raw_scoped_refptr_mismatch_checker.h"
 #include "base/memory/weak_ptr.h"
 #include "base/template_util.h"
@@ -51,18 +47,11 @@ namespace internal {
 // Types:
 //  RunnableAdapter<> -- Wraps the various "function" pointer types into an
 //                       object that adheres to the Runnable interface.
-//                       There are |3*ARITY| RunnableAdapter types.
-//  FunctionTraits<> -- Type traits that unwrap a function signature into a
-//                      a set of easier to use typedefs.  Used mainly for
-//                      compile time asserts.
-//                      There are |ARITY| FunctionTraits types.
 //  ForceVoidReturn<> -- Helper class for translating function signatures to
 //                       equivalent forms with a "void" return type.
-//                    There are |ARITY| ForceVoidReturn types.
 //  FunctorTraits<> -- Type traits used determine the correct RunType and
 //                     RunnableType for a Functor.  This is where function
 //                     signature adapters are applied.
-//                    There are |ARITY| ForceVoidReturn types.
 //  MakeRunnable<> -- Takes a Functor and returns an object in the Runnable
 //                    type class that represents the underlying Functor.
 //                    There are |O(1)| MakeRunnable types.
@@ -71,7 +60,6 @@ namespace internal {
 //                    and for ignoring return values.  This is separate from
 //                    Invoker to avoid creating multiple version of Invoker<>
 //                    which grows at O(n^2) with the arity.
-//                    There are |k*ARITY| InvokeHelper types.
 //  Invoker<> -- Unwraps the curried parameters and executes the Runnable.
 //               There are |(ARITY^2 + ARITY)/2| Invoketypes.
 //  BindState<> -- Stores the curried parameters, and is the main entry point
@@ -101,2686 +89,239 @@ namespace internal {
 template <typename Functor>
 class RunnableAdapter;
 
-// Function: Arity 0.
-template <typename R>
-class RunnableAdapter<R(*)()> {
- public:
-  typedef R (RunType)();
-
-  explicit RunnableAdapter(R(*function)())
-      : function_(function) {
-  }
-
-  R Run() {
-    return function_();
-  }
-
- private:
-  R (*function_)();
-};
-
-// Method: Arity 0.
-template <typename R, typename T>
-class RunnableAdapter<R(T::*)()> {
- public:
-  typedef R (RunType)(T*);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)())
-      : method_(method) {
-  }
-
-  R Run(T* object) {
-    return (object->*method_)();
-  }
-
- private:
-  R (T::*method_)();
-};
-
-// Const Method: Arity 0.
-template <typename R, typename T>
-class RunnableAdapter<R(T::*)() const> {
- public:
-  typedef R (RunType)(const T*);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)() const)
-      : method_(method) {
-  }
-
-  R Run(const T* object) {
-    return (object->*method_)();
-  }
-
- private:
-  R (T::*method_)() const;
-};
-
-// Function: Arity 1.
-template <typename R, typename A1>
-class RunnableAdapter<R(*)(A1)> {
+// Function.
+template <typename R, typename... Args>
+class RunnableAdapter<R(*)(Args...)> {
  public:
-  typedef R (RunType)(A1);
+  typedef R (RunType)(Args...);
 
-  explicit RunnableAdapter(R(*function)(A1))
+  explicit RunnableAdapter(R(*function)(Args...))
       : function_(function) {
   }
 
-  R Run(typename CallbackParamTraits<A1>::ForwardType a1) {
-    return function_(CallbackForward(a1));
-  }
-
- private:
-  R (*function_)(A1);
-};
-
-// Method: Arity 1.
-template <typename R, typename T, typename A1>
-class RunnableAdapter<R(T::*)(A1)> {
- public:
-  typedef R (RunType)(T*, A1);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1))
-      : method_(method) {
-  }
-
-  R Run(T* object, typename CallbackParamTraits<A1>::ForwardType a1) {
-    return (object->*method_)(CallbackForward(a1));
+  R Run(typename CallbackParamTraits<Args>::ForwardType... args) {
+    return function_(CallbackForward(args)...);
   }
 
  private:
-  R (T::*method_)(A1);
+  R (*function_)(Args...);
 };
 
-// Const Method: Arity 1.
-template <typename R, typename T, typename A1>
-class RunnableAdapter<R(T::*)(A1) const> {
+// Method.
+template <typename R, typename T, typename... Args>
+class RunnableAdapter<R(T::*)(Args...)> {
  public:
-  typedef R (RunType)(const T*, A1);
+  typedef R (RunType)(T*, Args...);
   typedef true_type IsMethod;
 
-  explicit RunnableAdapter(R(T::*method)(A1) const)
+  explicit RunnableAdapter(R(T::*method)(Args...))
       : method_(method) {
   }
 
-  R Run(const T* object, typename CallbackParamTraits<A1>::ForwardType a1) {
-    return (object->*method_)(CallbackForward(a1));
-  }
-
- private:
-  R (T::*method_)(A1) const;
-};
-
-// Function: Arity 2.
-template <typename R, typename A1, typename A2>
-class RunnableAdapter<R(*)(A1, A2)> {
- public:
-  typedef R (RunType)(A1, A2);
-
-  explicit RunnableAdapter(R(*function)(A1, A2))
-      : function_(function) {
-  }
-
-  R Run(typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2) {
-    return function_(CallbackForward(a1), CallbackForward(a2));
+  R Run(T* object, typename CallbackParamTraits<Args>::ForwardType... args) {
+    return (object->*method_)(CallbackForward(args)...);
   }
 
  private:
-  R (*function_)(A1, A2);
+  R (T::*method_)(Args...);
 };
 
-// Method: Arity 2.
-template <typename R, typename T, typename A1, typename A2>
-class RunnableAdapter<R(T::*)(A1, A2)> {
+// Const Method.
+template <typename R, typename T, typename... Args>
+class RunnableAdapter<R(T::*)(Args...) const> {
  public:
-  typedef R (RunType)(T*, A1, A2);
+  typedef R (RunType)(const T*, Args...);
   typedef true_type IsMethod;
 
-  explicit RunnableAdapter(R(T::*method)(A1, A2))
+  explicit RunnableAdapter(R(T::*method)(Args...) const)
       : method_(method) {
   }
 
-  R Run(T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2));
+  R Run(const T* object,
+        typename CallbackParamTraits<Args>::ForwardType... args) {
+    return (object->*method_)(CallbackForward(args)...);
   }
 
  private:
-  R (T::*method_)(A1, A2);
+  R (T::*method_)(Args...) const;
 };
 
-// Const Method: Arity 2.
-template <typename R, typename T, typename A1, typename A2>
-class RunnableAdapter<R(T::*)(A1, A2) const> {
- public:
-  typedef R (RunType)(const T*, A1, A2);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1, A2) const)
-      : method_(method) {
-  }
 
-  R Run(const T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2));
-  }
+// ForceVoidReturn<>
+//
+// Set of templates that support forcing the function return type to void.
+template <typename Sig>
+struct ForceVoidReturn;
 
- private:
-  R (T::*method_)(A1, A2) const;
+template <typename R, typename... Args>
+struct ForceVoidReturn<R(Args...)> {
+  typedef void(RunType)(Args...);
 };
 
-// Function: Arity 3.
-template <typename R, typename A1, typename A2, typename A3>
-class RunnableAdapter<R(*)(A1, A2, A3)> {
- public:
-  typedef R (RunType)(A1, A2, A3);
-
-  explicit RunnableAdapter(R(*function)(A1, A2, A3))
-      : function_(function) {
-  }
-
-  R Run(typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3) {
-    return function_(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3));
-  }
 
- private:
-  R (*function_)(A1, A2, A3);
+// FunctorTraits<>
+//
+// See description at top of file.
+template <typename T>
+struct FunctorTraits {
+  typedef RunnableAdapter<T> RunnableType;
+  typedef typename RunnableType::RunType RunType;
 };
 
-// Method: Arity 3.
-template <typename R, typename T, typename A1, typename A2, typename A3>
-class RunnableAdapter<R(T::*)(A1, A2, A3)> {
- public:
-  typedef R (RunType)(T*, A1, A2, A3);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3))
-      : method_(method) {
-  }
-
-  R Run(T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3));
-  }
-
- private:
-  R (T::*method_)(A1, A2, A3);
+template <typename T>
+struct FunctorTraits<IgnoreResultHelper<T> > {
+  typedef typename FunctorTraits<T>::RunnableType RunnableType;
+  typedef typename ForceVoidReturn<
+      typename RunnableType::RunType>::RunType RunType;
 };
 
-// Const Method: Arity 3.
-template <typename R, typename T, typename A1, typename A2, typename A3>
-class RunnableAdapter<R(T::*)(A1, A2, A3) const> {
- public:
-  typedef R (RunType)(const T*, A1, A2, A3);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3) const)
-      : method_(method) {
-  }
-
-  R Run(const T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3));
-  }
-
- private:
-  R (T::*method_)(A1, A2, A3) const;
+template <typename T>
+struct FunctorTraits<Callback<T> > {
+  typedef Callback<T> RunnableType;
+  typedef typename Callback<T>::RunType RunType;
 };
 
-// Function: Arity 4.
-template <typename R, typename A1, typename A2, typename A3, typename A4>
-class RunnableAdapter<R(*)(A1, A2, A3, A4)> {
- public:
-  typedef R (RunType)(A1, A2, A3, A4);
-
-  explicit RunnableAdapter(R(*function)(A1, A2, A3, A4))
-      : function_(function) {
-  }
-
-  R Run(typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4) {
-    return function_(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4));
-  }
-
- private:
-  R (*function_)(A1, A2, A3, A4);
-};
 
-// Method: Arity 4.
-template <typename R, typename T, typename A1, typename A2, typename A3,
-    typename A4>
-class RunnableAdapter<R(T::*)(A1, A2, A3, A4)> {
- public:
-  typedef R (RunType)(T*, A1, A2, A3, A4);
-  typedef true_type IsMethod;
+// MakeRunnable<>
+//
+// Converts a passed in functor to a RunnableType using type inference.
 
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3, A4))
-      : method_(method) {
-  }
+template <typename T>
+typename FunctorTraits<T>::RunnableType MakeRunnable(const T& t) {
+  return RunnableAdapter<T>(t);
+}
 
-  R Run(T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4));
-  }
+template <typename T>
+typename FunctorTraits<T>::RunnableType
+MakeRunnable(const IgnoreResultHelper<T>& t) {
+  return MakeRunnable(t.functor_);
+}
 
- private:
-  R (T::*method_)(A1, A2, A3, A4);
-};
+template <typename T>
+const typename FunctorTraits<Callback<T> >::RunnableType&
+MakeRunnable(const Callback<T>& t) {
+  DCHECK(!t.is_null());
+  return t;
+}
 
-// Const Method: Arity 4.
-template <typename R, typename T, typename A1, typename A2, typename A3,
-    typename A4>
-class RunnableAdapter<R(T::*)(A1, A2, A3, A4) const> {
- public:
-  typedef R (RunType)(const T*, A1, A2, A3, A4);
-  typedef true_type IsMethod;
 
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3, A4) const)
-      : method_(method) {
-  }
+// InvokeHelper<>
+//
+// There are 3 logical InvokeHelper<> specializations: normal, void-return,
+// WeakCalls.
+//
+// The normal type just calls the underlying runnable.
+//
+// We need a InvokeHelper to handle void return types in order to support
+// IgnoreResult().  Normally, if the Runnable's RunType had a void return,
+// the template system would just accept "return functor.Run()" ignoring
+// the fact that a void function is being used with return. This piece of
+// sugar breaks though when the Runnable's RunType is not void.  Thus, we
+// need a partial specialization to change the syntax to drop the "return"
+// from the invocation call.
+//
+// WeakCalls similarly need special syntax that is applied to the first
+// argument to check if they should no-op themselves.
+template <bool IsWeakCall, typename ReturnType, typename Runnable,
+          typename ArgsType>
+struct InvokeHelper;
 
-  R Run(const T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4));
+template <typename ReturnType, typename Runnable, typename... Args>
+struct InvokeHelper<false, ReturnType, Runnable, TypeList<Args...>> {
+  static ReturnType MakeItSo(Runnable runnable, Args... args) {
+    return runnable.Run(CallbackForward(args)...);
   }
-
- private:
-  R (T::*method_)(A1, A2, A3, A4) const;
 };
 
-// Function: Arity 5.
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5>
-class RunnableAdapter<R(*)(A1, A2, A3, A4, A5)> {
- public:
-  typedef R (RunType)(A1, A2, A3, A4, A5);
-
-  explicit RunnableAdapter(R(*function)(A1, A2, A3, A4, A5))
-      : function_(function) {
-  }
-
-  R Run(typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5) {
-    return function_(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5));
+template <typename Runnable, typename... Args>
+struct InvokeHelper<false, void, Runnable, TypeList<Args...>> {
+  static void MakeItSo(Runnable runnable, Args... args) {
+    runnable.Run(CallbackForward(args)...);
   }
-
- private:
-  R (*function_)(A1, A2, A3, A4, A5);
 };
 
-// Method: Arity 5.
-template <typename R, typename T, typename A1, typename A2, typename A3,
-    typename A4, typename A5>
-class RunnableAdapter<R(T::*)(A1, A2, A3, A4, A5)> {
- public:
-  typedef R (RunType)(T*, A1, A2, A3, A4, A5);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3, A4, A5))
-      : method_(method) {
-  }
-
-  R Run(T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5));
+template <typename Runnable, typename BoundWeakPtr, typename... Args>
+struct InvokeHelper<true, void, Runnable, TypeList<BoundWeakPtr, Args...>> {
+  static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr, Args... args) {
+    if (!weak_ptr.get()) {
+      return;
+    }
+    runnable.Run(weak_ptr.get(), CallbackForward(args)...);
   }
-
- private:
-  R (T::*method_)(A1, A2, A3, A4, A5);
 };
 
-// Const Method: Arity 5.
-template <typename R, typename T, typename A1, typename A2, typename A3,
-    typename A4, typename A5>
-class RunnableAdapter<R(T::*)(A1, A2, A3, A4, A5) const> {
- public:
-  typedef R (RunType)(const T*, A1, A2, A3, A4, A5);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3, A4, A5) const)
-      : method_(method) {
-  }
-
-  R Run(const T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5));
-  }
+#if !defined(_MSC_VER)
 
- private:
-  R (T::*method_)(A1, A2, A3, A4, A5) const;
+template <typename ReturnType, typename Runnable, typename ArgsType>
+struct InvokeHelper<true, ReturnType, Runnable, ArgsType> {
+  // WeakCalls are only supported for functions with a void return type.
+  // Otherwise, the function result would be undefined if the the WeakPtr<>
+  // is invalidated.
+  COMPILE_ASSERT(is_void<ReturnType>::value,
+                 weak_ptrs_can_only_bind_to_methods_without_return_values);
 };
 
-// Function: Arity 6.
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6>
-class RunnableAdapter<R(*)(A1, A2, A3, A4, A5, A6)> {
- public:
-  typedef R (RunType)(A1, A2, A3, A4, A5, A6);
-
-  explicit RunnableAdapter(R(*function)(A1, A2, A3, A4, A5, A6))
-      : function_(function) {
-  }
-
-  R Run(typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5,
-      typename CallbackParamTraits<A6>::ForwardType a6) {
-    return function_(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5),
-        CallbackForward(a6));
-  }
-
- private:
-  R (*function_)(A1, A2, A3, A4, A5, A6);
-};
+#endif
 
-// Method: Arity 6.
-template <typename R, typename T, typename A1, typename A2, typename A3,
-    typename A4, typename A5, typename A6>
-class RunnableAdapter<R(T::*)(A1, A2, A3, A4, A5, A6)> {
- public:
-  typedef R (RunType)(T*, A1, A2, A3, A4, A5, A6);
-  typedef true_type IsMethod;
+// Invoker<>
+//
+// See description at the top of the file.
+template <int NumBound, typename Storage, typename RunType>
+struct Invoker;
 
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3, A4, A5, A6))
-      : method_(method) {
-  }
+template <int n, typename StorageType, typename RunType>
+struct InvokerRunHelper;
 
-  R Run(T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5,
-      typename CallbackParamTraits<A6>::ForwardType a6) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5),
-        CallbackForward(a6));
+template <int n, typename StorageType, typename R, typename... Args>
+struct InvokerRunHelper<n, StorageType, R(BindStateBase*, Args...)> {
+  static R Run(BindStateBase* base, Args... args) {
+    return ExtractHelper<
+        n, StorageType, R,
+        typename CallbackParamTraits<Args>::ForwardType...>::Invoke(
+            static_cast<StorageType*>(base),
+            CallbackForward(args)...);
   }
-
- private:
-  R (T::*method_)(A1, A2, A3, A4, A5, A6);
 };
 
-// Const Method: Arity 6.
-template <typename R, typename T, typename A1, typename A2, typename A3,
-    typename A4, typename A5, typename A6>
-class RunnableAdapter<R(T::*)(A1, A2, A3, A4, A5, A6) const> {
- public:
-  typedef R (RunType)(const T*, A1, A2, A3, A4, A5, A6);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3, A4, A5, A6) const)
-      : method_(method) {
-  }
-
-  R Run(const T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5,
-      typename CallbackParamTraits<A6>::ForwardType a6) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5),
-        CallbackForward(a6));
-  }
-
- private:
-  R (T::*method_)(A1, A2, A3, A4, A5, A6) const;
+template <int n, typename StorageType, typename R, typename... Args>
+struct Invoker<n, StorageType, R(Args...)>
+    : public InvokerRunHelper<n, StorageType,
+                              typename RunTypeHelper<n, R, Args...>::RunType> {
+  typedef typename RunTypeHelper<n, R, Args...>::RunType RunType;
+  typedef typename RunTypeHelper<n, R, Args...>::UnboundRunType
+      UnboundRunType;
 };
 
-// Function: Arity 7.
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6, typename A7>
-class RunnableAdapter<R(*)(A1, A2, A3, A4, A5, A6, A7)> {
- public:
-  typedef R (RunType)(A1, A2, A3, A4, A5, A6, A7);
-
-  explicit RunnableAdapter(R(*function)(A1, A2, A3, A4, A5, A6, A7))
-      : function_(function) {
-  }
-
-  R Run(typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5,
-      typename CallbackParamTraits<A6>::ForwardType a6,
-      typename CallbackParamTraits<A7>::ForwardType a7) {
-    return function_(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5),
-        CallbackForward(a6), CallbackForward(a7));
-  }
-
- private:
-  R (*function_)(A1, A2, A3, A4, A5, A6, A7);
-};
+// BindState<>
+//
+// This stores all the state passed into Bind() and is also where most
+// of the template resolution magic occurs.
+//
+// Runnable is the functor we are binding arguments to.
+// RunType is type of the Run() function that the Invoker<> should use.
+// Normally, this is the same as the RunType of the Runnable, but it can
+// be different if an adapter like IgnoreResult() has been used.
+//
+// BoundArgsType contains the storage type for all the bound arguments by
+// (ab)using a function type.
+template <typename Runnable, typename RunType, typename... BoundArgs>
+struct BindState<Runnable, RunType, TypeList<BoundArgs...>>
+    : public BindStateBase {
+  typedef Runnable RunnableType;
+  typedef IsWeakMethod<HasIsMethodTag<Runnable>::value, BoundArgs...>
+      IsWeakCall;
+  typedef Invoker<sizeof...(BoundArgs), BindState, RunType> InvokerType;
+  typedef typename InvokerType::UnboundRunType UnboundRunType;
 
-// Method: Arity 7.
-template <typename R, typename T, typename A1, typename A2, typename A3,
-    typename A4, typename A5, typename A6, typename A7>
-class RunnableAdapter<R(T::*)(A1, A2, A3, A4, A5, A6, A7)> {
- public:
-  typedef R (RunType)(T*, A1, A2, A3, A4, A5, A6, A7);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3, A4, A5, A6, A7))
-      : method_(method) {
-  }
-
-  R Run(T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5,
-      typename CallbackParamTraits<A6>::ForwardType a6,
-      typename CallbackParamTraits<A7>::ForwardType a7) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5),
-        CallbackForward(a6), CallbackForward(a7));
-  }
-
- private:
-  R (T::*method_)(A1, A2, A3, A4, A5, A6, A7);
-};
-
-// Const Method: Arity 7.
-template <typename R, typename T, typename A1, typename A2, typename A3,
-    typename A4, typename A5, typename A6, typename A7>
-class RunnableAdapter<R(T::*)(A1, A2, A3, A4, A5, A6, A7) const> {
- public:
-  typedef R (RunType)(const T*, A1, A2, A3, A4, A5, A6, A7);
-  typedef true_type IsMethod;
-
-  explicit RunnableAdapter(R(T::*method)(A1, A2, A3, A4, A5, A6, A7) const)
-      : method_(method) {
-  }
-
-  R Run(const T* object, typename CallbackParamTraits<A1>::ForwardType a1,
-      typename CallbackParamTraits<A2>::ForwardType a2,
-      typename CallbackParamTraits<A3>::ForwardType a3,
-      typename CallbackParamTraits<A4>::ForwardType a4,
-      typename CallbackParamTraits<A5>::ForwardType a5,
-      typename CallbackParamTraits<A6>::ForwardType a6,
-      typename CallbackParamTraits<A7>::ForwardType a7) {
-    return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5),
-        CallbackForward(a6), CallbackForward(a7));
-  }
-
- private:
-  R (T::*method_)(A1, A2, A3, A4, A5, A6, A7) const;
-};
-
-
-// FunctionTraits<>
-//
-// Breaks a function signature apart into typedefs for easier introspection.
-template <typename Sig>
-struct FunctionTraits;
-
-template <typename R>
-struct FunctionTraits<R()> {
-  typedef R ReturnType;
-};
-
-template <typename R, typename A1>
-struct FunctionTraits<R(A1)> {
-  typedef R ReturnType;
-  typedef A1 A1Type;
-};
-
-template <typename R, typename A1, typename A2>
-struct FunctionTraits<R(A1, A2)> {
-  typedef R ReturnType;
-  typedef A1 A1Type;
-  typedef A2 A2Type;
-};
-
-template <typename R, typename A1, typename A2, typename A3>
-struct FunctionTraits<R(A1, A2, A3)> {
-  typedef R ReturnType;
-  typedef A1 A1Type;
-  typedef A2 A2Type;
-  typedef A3 A3Type;
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4>
-struct FunctionTraits<R(A1, A2, A3, A4)> {
-  typedef R ReturnType;
-  typedef A1 A1Type;
-  typedef A2 A2Type;
-  typedef A3 A3Type;
-  typedef A4 A4Type;
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5>
-struct FunctionTraits<R(A1, A2, A3, A4, A5)> {
-  typedef R ReturnType;
-  typedef A1 A1Type;
-  typedef A2 A2Type;
-  typedef A3 A3Type;
-  typedef A4 A4Type;
-  typedef A5 A5Type;
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6>
-struct FunctionTraits<R(A1, A2, A3, A4, A5, A6)> {
-  typedef R ReturnType;
-  typedef A1 A1Type;
-  typedef A2 A2Type;
-  typedef A3 A3Type;
-  typedef A4 A4Type;
-  typedef A5 A5Type;
-  typedef A6 A6Type;
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6, typename A7>
-struct FunctionTraits<R(A1, A2, A3, A4, A5, A6, A7)> {
-  typedef R ReturnType;
-  typedef A1 A1Type;
-  typedef A2 A2Type;
-  typedef A3 A3Type;
-  typedef A4 A4Type;
-  typedef A5 A5Type;
-  typedef A6 A6Type;
-  typedef A7 A7Type;
-};
-
-
-// ForceVoidReturn<>
-//
-// Set of templates that support forcing the function return type to void.
-template <typename Sig>
-struct ForceVoidReturn;
-
-template <typename R>
-struct ForceVoidReturn<R()> {
-  typedef void(RunType)();
-};
-
-template <typename R, typename A1>
-struct ForceVoidReturn<R(A1)> {
-  typedef void(RunType)(A1);
-};
-
-template <typename R, typename A1, typename A2>
-struct ForceVoidReturn<R(A1, A2)> {
-  typedef void(RunType)(A1, A2);
-};
-
-template <typename R, typename A1, typename A2, typename A3>
-struct ForceVoidReturn<R(A1, A2, A3)> {
-  typedef void(RunType)(A1, A2, A3);
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4>
-struct ForceVoidReturn<R(A1, A2, A3, A4)> {
-  typedef void(RunType)(A1, A2, A3, A4);
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5>
-struct ForceVoidReturn<R(A1, A2, A3, A4, A5)> {
-  typedef void(RunType)(A1, A2, A3, A4, A5);
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6>
-struct ForceVoidReturn<R(A1, A2, A3, A4, A5, A6)> {
-  typedef void(RunType)(A1, A2, A3, A4, A5, A6);
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6, typename A7>
-struct ForceVoidReturn<R(A1, A2, A3, A4, A5, A6, A7)> {
-  typedef void(RunType)(A1, A2, A3, A4, A5, A6, A7);
-};
-
-
-// FunctorTraits<>
-//
-// See description at top of file.
-template <typename T>
-struct FunctorTraits {
-  typedef RunnableAdapter<T> RunnableType;
-  typedef typename RunnableType::RunType RunType;
-};
-
-template <typename T>
-struct FunctorTraits<IgnoreResultHelper<T> > {
-  typedef typename FunctorTraits<T>::RunnableType RunnableType;
-  typedef typename ForceVoidReturn<
-      typename RunnableType::RunType>::RunType RunType;
-};
-
-template <typename T>
-struct FunctorTraits<Callback<T> > {
-  typedef Callback<T> RunnableType;
-  typedef typename Callback<T>::RunType RunType;
-};
-
-
-// MakeRunnable<>
-//
-// Converts a passed in functor to a RunnableType using type inference.
-
-template <typename T>
-typename FunctorTraits<T>::RunnableType MakeRunnable(const T& t) {
-  return RunnableAdapter<T>(t);
-}
-
-template <typename T>
-typename FunctorTraits<T>::RunnableType
-MakeRunnable(const IgnoreResultHelper<T>& t) {
-  return MakeRunnable(t.functor_);
-}
-
-template <typename T>
-const typename FunctorTraits<Callback<T> >::RunnableType&
-MakeRunnable(const Callback<T>& t) {
-  DCHECK(!t.is_null());
-  return t;
-}
-
-
-// InvokeHelper<>
-//
-// There are 3 logical InvokeHelper<> specializations: normal, void-return,
-// WeakCalls.
-//
-// The normal type just calls the underlying runnable.
-//
-// We need a InvokeHelper to handle void return types in order to support
-// IgnoreResult().  Normally, if the Runnable's RunType had a void return,
-// the template system would just accept "return functor.Run()" ignoring
-// the fact that a void function is being used with return. This piece of
-// sugar breaks though when the Runnable's RunType is not void.  Thus, we
-// need a partial specialization to change the syntax to drop the "return"
-// from the invocation call.
-//
-// WeakCalls similarly need special syntax that is applied to the first
-// argument to check if they should no-op themselves.
-template <bool IsWeakCall, typename ReturnType, typename Runnable,
-          typename ArgsType>
-struct InvokeHelper;
-
-template <typename ReturnType, typename Runnable>
-struct InvokeHelper<false, ReturnType, Runnable,
-    void()>  {
-  static ReturnType MakeItSo(Runnable runnable) {
-    return runnable.Run();
-  }
-};
-
-template <typename Runnable>
-struct InvokeHelper<false, void, Runnable,
-    void()>  {
-  static void MakeItSo(Runnable runnable) {
-    runnable.Run();
-  }
-};
-
-template <typename ReturnType, typename Runnable,typename A1>
-struct InvokeHelper<false, ReturnType, Runnable,
-    void(A1)>  {
-  static ReturnType MakeItSo(Runnable runnable, A1 a1) {
-    return runnable.Run(CallbackForward(a1));
-  }
-};
-
-template <typename Runnable,typename A1>
-struct InvokeHelper<false, void, Runnable,
-    void(A1)>  {
-  static void MakeItSo(Runnable runnable, A1 a1) {
-    runnable.Run(CallbackForward(a1));
-  }
-};
-
-template <typename Runnable, typename BoundWeakPtr>
-struct InvokeHelper<true, void, Runnable,
-    void(BoundWeakPtr)>  {
-  static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr) {
-    if (!weak_ptr.get()) {
-      return;
-    }
-    runnable.Run(weak_ptr.get());
-  }
-};
-
-template <typename ReturnType, typename Runnable,typename A1, typename A2>
-struct InvokeHelper<false, ReturnType, Runnable,
-    void(A1, A2)>  {
-  static ReturnType MakeItSo(Runnable runnable, A1 a1, A2 a2) {
-    return runnable.Run(CallbackForward(a1), CallbackForward(a2));
-  }
-};
-
-template <typename Runnable,typename A1, typename A2>
-struct InvokeHelper<false, void, Runnable,
-    void(A1, A2)>  {
-  static void MakeItSo(Runnable runnable, A1 a1, A2 a2) {
-    runnable.Run(CallbackForward(a1), CallbackForward(a2));
-  }
-};
-
-template <typename Runnable, typename BoundWeakPtr, typename A2>
-struct InvokeHelper<true, void, Runnable,
-    void(BoundWeakPtr, A2)>  {
-  static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr, A2 a2) {
-    if (!weak_ptr.get()) {
-      return;
-    }
-    runnable.Run(weak_ptr.get(), CallbackForward(a2));
-  }
-};
-
-template <typename ReturnType, typename Runnable,typename A1, typename A2,
-    typename A3>
-struct InvokeHelper<false, ReturnType, Runnable,
-    void(A1, A2, A3)>  {
-  static ReturnType MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3) {
-    return runnable.Run(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3));
-  }
-};
-
-template <typename Runnable,typename A1, typename A2, typename A3>
-struct InvokeHelper<false, void, Runnable,
-    void(A1, A2, A3)>  {
-  static void MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3) {
-    runnable.Run(CallbackForward(a1), CallbackForward(a2), CallbackForward(a3));
-  }
-};
-
-template <typename Runnable, typename BoundWeakPtr, typename A2, typename A3>
-struct InvokeHelper<true, void, Runnable,
-    void(BoundWeakPtr, A2, A3)>  {
-  static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr, A2 a2, A3 a3) {
-    if (!weak_ptr.get()) {
-      return;
-    }
-    runnable.Run(weak_ptr.get(), CallbackForward(a2), CallbackForward(a3));
-  }
-};
-
-template <typename ReturnType, typename Runnable,typename A1, typename A2,
-    typename A3, typename A4>
-struct InvokeHelper<false, ReturnType, Runnable,
-    void(A1, A2, A3, A4)>  {
-  static ReturnType MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3, A4 a4) {
-    return runnable.Run(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4));
-  }
-};
-
-template <typename Runnable,typename A1, typename A2, typename A3, typename A4>
-struct InvokeHelper<false, void, Runnable,
-    void(A1, A2, A3, A4)>  {
-  static void MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3, A4 a4) {
-    runnable.Run(CallbackForward(a1), CallbackForward(a2), CallbackForward(a3),
-        CallbackForward(a4));
-  }
-};
-
-template <typename Runnable, typename BoundWeakPtr, typename A2, typename A3,
-    typename A4>
-struct InvokeHelper<true, void, Runnable,
-    void(BoundWeakPtr, A2, A3, A4)>  {
-  static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr, A2 a2, A3 a3,
-      A4 a4) {
-    if (!weak_ptr.get()) {
-      return;
-    }
-    runnable.Run(weak_ptr.get(), CallbackForward(a2), CallbackForward(a3),
-        CallbackForward(a4));
-  }
-};
-
-template <typename ReturnType, typename Runnable,typename A1, typename A2,
-    typename A3, typename A4, typename A5>
-struct InvokeHelper<false, ReturnType, Runnable,
-    void(A1, A2, A3, A4, A5)>  {
-  static ReturnType MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3, A4 a4,
-      A5 a5) {
-    return runnable.Run(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5));
-  }
-};
-
-template <typename Runnable,typename A1, typename A2, typename A3, typename A4,
-    typename A5>
-struct InvokeHelper<false, void, Runnable,
-    void(A1, A2, A3, A4, A5)>  {
-  static void MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5) {
-    runnable.Run(CallbackForward(a1), CallbackForward(a2), CallbackForward(a3),
-        CallbackForward(a4), CallbackForward(a5));
-  }
-};
-
-template <typename Runnable, typename BoundWeakPtr, typename A2, typename A3,
-    typename A4, typename A5>
-struct InvokeHelper<true, void, Runnable,
-    void(BoundWeakPtr, A2, A3, A4, A5)>  {
-  static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr, A2 a2, A3 a3,
-      A4 a4, A5 a5) {
-    if (!weak_ptr.get()) {
-      return;
-    }
-    runnable.Run(weak_ptr.get(), CallbackForward(a2), CallbackForward(a3),
-        CallbackForward(a4), CallbackForward(a5));
-  }
-};
-
-template <typename ReturnType, typename Runnable,typename A1, typename A2,
-    typename A3, typename A4, typename A5, typename A6>
-struct InvokeHelper<false, ReturnType, Runnable,
-    void(A1, A2, A3, A4, A5, A6)>  {
-  static ReturnType MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3, A4 a4,
-      A5 a5, A6 a6) {
-    return runnable.Run(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5),
-        CallbackForward(a6));
-  }
-};
-
-template <typename Runnable,typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6>
-struct InvokeHelper<false, void, Runnable,
-    void(A1, A2, A3, A4, A5, A6)>  {
-  static void MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5,
-      A6 a6) {
-    runnable.Run(CallbackForward(a1), CallbackForward(a2), CallbackForward(a3),
-        CallbackForward(a4), CallbackForward(a5), CallbackForward(a6));
-  }
-};
-
-template <typename Runnable, typename BoundWeakPtr, typename A2, typename A3,
-    typename A4, typename A5, typename A6>
-struct InvokeHelper<true, void, Runnable,
-    void(BoundWeakPtr, A2, A3, A4, A5, A6)>  {
-  static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr, A2 a2, A3 a3,
-      A4 a4, A5 a5, A6 a6) {
-    if (!weak_ptr.get()) {
-      return;
-    }
-    runnable.Run(weak_ptr.get(), CallbackForward(a2), CallbackForward(a3),
-        CallbackForward(a4), CallbackForward(a5), CallbackForward(a6));
-  }
-};
-
-template <typename ReturnType, typename Runnable,typename A1, typename A2,
-    typename A3, typename A4, typename A5, typename A6, typename A7>
-struct InvokeHelper<false, ReturnType, Runnable,
-    void(A1, A2, A3, A4, A5, A6, A7)>  {
-  static ReturnType MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3, A4 a4,
-      A5 a5, A6 a6, A7 a7) {
-    return runnable.Run(CallbackForward(a1), CallbackForward(a2),
-        CallbackForward(a3), CallbackForward(a4), CallbackForward(a5),
-        CallbackForward(a6), CallbackForward(a7));
-  }
-};
-
-template <typename Runnable,typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6, typename A7>
-struct InvokeHelper<false, void, Runnable,
-    void(A1, A2, A3, A4, A5, A6, A7)>  {
-  static void MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5,
-      A6 a6, A7 a7) {
-    runnable.Run(CallbackForward(a1), CallbackForward(a2), CallbackForward(a3),
-        CallbackForward(a4), CallbackForward(a5), CallbackForward(a6),
-        CallbackForward(a7));
-  }
-};
-
-template <typename Runnable, typename BoundWeakPtr, typename A2, typename A3,
-    typename A4, typename A5, typename A6, typename A7>
-struct InvokeHelper<true, void, Runnable,
-    void(BoundWeakPtr, A2, A3, A4, A5, A6, A7)>  {
-  static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr, A2 a2, A3 a3,
-      A4 a4, A5 a5, A6 a6, A7 a7) {
-    if (!weak_ptr.get()) {
-      return;
-    }
-    runnable.Run(weak_ptr.get(), CallbackForward(a2), CallbackForward(a3),
-        CallbackForward(a4), CallbackForward(a5), CallbackForward(a6),
-        CallbackForward(a7));
-  }
-};
-
-#if !defined(_MSC_VER)
-
-template <typename ReturnType, typename Runnable, typename ArgsType>
-struct InvokeHelper<true, ReturnType, Runnable, ArgsType> {
-  // WeakCalls are only supported for functions with a void return type.
-  // Otherwise, the function result would be undefined if the the WeakPtr<>
-  // is invalidated.
-  COMPILE_ASSERT(is_void<ReturnType>::value,
-                 weak_ptrs_can_only_bind_to_methods_without_return_values);
-};
-
-#endif
-
-// Invoker<>
-//
-// See description at the top of the file.
-template <int NumBound, typename Storage, typename RunType>
-struct Invoker;
-
-// Arity 0 -> 0.
-template <typename StorageType, typename R>
-struct Invoker<0, StorageType, R()> {
-  typedef R(RunType)(BindStateBase*);
-
-  typedef R(UnboundRunType)();
-
-  static R Run(BindStateBase* base) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void()>
-               ::MakeItSo(storage->runnable_);
-  }
-};
-
-// Arity 1 -> 1.
-template <typename StorageType, typename R,typename X1>
-struct Invoker<0, StorageType, R(X1)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X1>::ForwardType);
-
-  typedef R(UnboundRunType)(X1);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X1>::ForwardType x1) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename CallbackParamTraits<X1>::ForwardType x1)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1));
-  }
-};
-
-// Arity 1 -> 0.
-template <typename StorageType, typename R,typename X1>
-struct Invoker<1, StorageType, R(X1)> {
-  typedef R(RunType)(BindStateBase*);
-
-  typedef R(UnboundRunType)();
-
-  static R Run(BindStateBase* base) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1));
-  }
-};
-
-// Arity 2 -> 2.
-template <typename StorageType, typename R,typename X1, typename X2>
-struct Invoker<0, StorageType, R(X1, X2)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X1>::ForwardType,
-      typename CallbackParamTraits<X2>::ForwardType);
-
-  typedef R(UnboundRunType)(X1, X2);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X1>::ForwardType x1,
-      typename CallbackParamTraits<X2>::ForwardType x2) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename CallbackParamTraits<X1>::ForwardType x1,
-               typename CallbackParamTraits<X2>::ForwardType x2)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2));
-  }
-};
-
-// Arity 2 -> 1.
-template <typename StorageType, typename R,typename X1, typename X2>
-struct Invoker<1, StorageType, R(X1, X2)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X2>::ForwardType);
-
-  typedef R(UnboundRunType)(X2);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X2>::ForwardType x2) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X2>::ForwardType x2)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2));
-  }
-};
-
-// Arity 2 -> 0.
-template <typename StorageType, typename R,typename X1, typename X2>
-struct Invoker<2, StorageType, R(X1, X2)> {
-  typedef R(RunType)(BindStateBase*);
-
-  typedef R(UnboundRunType)();
-
-  static R Run(BindStateBase* base) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2));
-  }
-};
-
-// Arity 3 -> 3.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3>
-struct Invoker<0, StorageType, R(X1, X2, X3)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X1>::ForwardType,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType);
-
-  typedef R(UnboundRunType)(X1, X2, X3);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X1>::ForwardType x1,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename CallbackParamTraits<X1>::ForwardType x1,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3));
-  }
-};
-
-// Arity 3 -> 2.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3>
-struct Invoker<1, StorageType, R(X1, X2, X3)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType);
-
-  typedef R(UnboundRunType)(X2, X3);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3));
-  }
-};
-
-// Arity 3 -> 1.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3>
-struct Invoker<2, StorageType, R(X1, X2, X3)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X3>::ForwardType);
-
-  typedef R(UnboundRunType)(X3);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X3>::ForwardType x3) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X3>::ForwardType x3)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3));
-  }
-};
-
-// Arity 3 -> 0.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3>
-struct Invoker<3, StorageType, R(X1, X2, X3)> {
-  typedef R(RunType)(BindStateBase*);
-
-  typedef R(UnboundRunType)();
-
-  static R Run(BindStateBase* base) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3));
-  }
-};
-
-// Arity 4 -> 4.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4>
-struct Invoker<0, StorageType, R(X1, X2, X3, X4)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X1>::ForwardType,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType);
-
-  typedef R(UnboundRunType)(X1, X2, X3, X4);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X1>::ForwardType x1,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename CallbackParamTraits<X1>::ForwardType x1,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4));
-  }
-};
-
-// Arity 4 -> 3.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4>
-struct Invoker<1, StorageType, R(X1, X2, X3, X4)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType);
-
-  typedef R(UnboundRunType)(X2, X3, X4);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4));
-  }
-};
-
-// Arity 4 -> 2.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4>
-struct Invoker<2, StorageType, R(X1, X2, X3, X4)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType);
-
-  typedef R(UnboundRunType)(X3, X4);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4));
-  }
-};
-
-// Arity 4 -> 1.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4>
-struct Invoker<3, StorageType, R(X1, X2, X3, X4)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X4>::ForwardType);
-
-  typedef R(UnboundRunType)(X4);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X4>::ForwardType x4) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X4>::ForwardType x4)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4));
-  }
-};
-
-// Arity 4 -> 0.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4>
-struct Invoker<4, StorageType, R(X1, X2, X3, X4)> {
-  typedef R(RunType)(BindStateBase*);
-
-  typedef R(UnboundRunType)();
-
-  static R Run(BindStateBase* base) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4));
-  }
-};
-
-// Arity 5 -> 5.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5>
-struct Invoker<0, StorageType, R(X1, X2, X3, X4, X5)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X1>::ForwardType,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType);
-
-  typedef R(UnboundRunType)(X1, X2, X3, X4, X5);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X1>::ForwardType x1,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename CallbackParamTraits<X1>::ForwardType x1,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5));
-  }
-};
-
-// Arity 5 -> 4.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5>
-struct Invoker<1, StorageType, R(X1, X2, X3, X4, X5)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType);
-
-  typedef R(UnboundRunType)(X2, X3, X4, X5);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5));
-  }
-};
-
-// Arity 5 -> 3.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5>
-struct Invoker<2, StorageType, R(X1, X2, X3, X4, X5)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType);
-
-  typedef R(UnboundRunType)(X3, X4, X5);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5));
-  }
-};
-
-// Arity 5 -> 2.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5>
-struct Invoker<3, StorageType, R(X1, X2, X3, X4, X5)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType);
-
-  typedef R(UnboundRunType)(X4, X5);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5));
-  }
-};
-
-// Arity 5 -> 1.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5>
-struct Invoker<4, StorageType, R(X1, X2, X3, X4, X5)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X5>::ForwardType);
-
-  typedef R(UnboundRunType)(X5);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X5>::ForwardType x5) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X5>::ForwardType x5)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5));
-  }
-};
-
-// Arity 5 -> 0.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5>
-struct Invoker<5, StorageType, R(X1, X2, X3, X4, X5)> {
-  typedef R(RunType)(BindStateBase*);
-
-  typedef R(UnboundRunType)();
-
-  static R Run(BindStateBase* base) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-    typedef typename StorageType::Bound5UnwrapTraits Bound5UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    typename Bound5UnwrapTraits::ForwardType x5 =
-        Bound5UnwrapTraits::Unwrap(storage->p5_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename Bound5UnwrapTraits::ForwardType)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5));
-  }
-};
-
-// Arity 6 -> 6.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6>
-struct Invoker<0, StorageType, R(X1, X2, X3, X4, X5, X6)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X1>::ForwardType,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType);
-
-  typedef R(UnboundRunType)(X1, X2, X3, X4, X5, X6);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X1>::ForwardType x1,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename CallbackParamTraits<X1>::ForwardType x1,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6));
-  }
-};
-
-// Arity 6 -> 5.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6>
-struct Invoker<1, StorageType, R(X1, X2, X3, X4, X5, X6)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType);
-
-  typedef R(UnboundRunType)(X2, X3, X4, X5, X6);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6));
-  }
-};
-
-// Arity 6 -> 4.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6>
-struct Invoker<2, StorageType, R(X1, X2, X3, X4, X5, X6)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType);
-
-  typedef R(UnboundRunType)(X3, X4, X5, X6);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6));
-  }
-};
-
-// Arity 6 -> 3.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6>
-struct Invoker<3, StorageType, R(X1, X2, X3, X4, X5, X6)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType);
-
-  typedef R(UnboundRunType)(X4, X5, X6);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6));
-  }
-};
-
-// Arity 6 -> 2.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6>
-struct Invoker<4, StorageType, R(X1, X2, X3, X4, X5, X6)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType);
-
-  typedef R(UnboundRunType)(X5, X6);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6));
-  }
-};
-
-// Arity 6 -> 1.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6>
-struct Invoker<5, StorageType, R(X1, X2, X3, X4, X5, X6)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X6>::ForwardType);
-
-  typedef R(UnboundRunType)(X6);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X6>::ForwardType x6) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-    typedef typename StorageType::Bound5UnwrapTraits Bound5UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    typename Bound5UnwrapTraits::ForwardType x5 =
-        Bound5UnwrapTraits::Unwrap(storage->p5_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename Bound5UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X6>::ForwardType x6)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6));
-  }
-};
-
-// Arity 6 -> 0.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6>
-struct Invoker<6, StorageType, R(X1, X2, X3, X4, X5, X6)> {
-  typedef R(RunType)(BindStateBase*);
-
-  typedef R(UnboundRunType)();
-
-  static R Run(BindStateBase* base) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-    typedef typename StorageType::Bound5UnwrapTraits Bound5UnwrapTraits;
-    typedef typename StorageType::Bound6UnwrapTraits Bound6UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    typename Bound5UnwrapTraits::ForwardType x5 =
-        Bound5UnwrapTraits::Unwrap(storage->p5_);
-    typename Bound6UnwrapTraits::ForwardType x6 =
-        Bound6UnwrapTraits::Unwrap(storage->p6_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename Bound5UnwrapTraits::ForwardType,
-               typename Bound6UnwrapTraits::ForwardType)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6));
-  }
-};
-
-// Arity 7 -> 7.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6, typename X7>
-struct Invoker<0, StorageType, R(X1, X2, X3, X4, X5, X6, X7)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X1>::ForwardType,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType,
-      typename CallbackParamTraits<X7>::ForwardType);
-
-  typedef R(UnboundRunType)(X1, X2, X3, X4, X5, X6, X7);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X1>::ForwardType x1,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6,
-      typename CallbackParamTraits<X7>::ForwardType x7) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename CallbackParamTraits<X1>::ForwardType x1,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6,
-               typename CallbackParamTraits<X7>::ForwardType x7)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6), CallbackForward(x7));
-  }
-};
-
-// Arity 7 -> 6.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6, typename X7>
-struct Invoker<1, StorageType, R(X1, X2, X3, X4, X5, X6, X7)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X2>::ForwardType,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType,
-      typename CallbackParamTraits<X7>::ForwardType);
-
-  typedef R(UnboundRunType)(X2, X3, X4, X5, X6, X7);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X2>::ForwardType x2,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6,
-      typename CallbackParamTraits<X7>::ForwardType x7) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X2>::ForwardType x2,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6,
-               typename CallbackParamTraits<X7>::ForwardType x7)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6), CallbackForward(x7));
-  }
-};
-
-// Arity 7 -> 5.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6, typename X7>
-struct Invoker<2, StorageType, R(X1, X2, X3, X4, X5, X6, X7)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X3>::ForwardType,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType,
-      typename CallbackParamTraits<X7>::ForwardType);
-
-  typedef R(UnboundRunType)(X3, X4, X5, X6, X7);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X3>::ForwardType x3,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6,
-      typename CallbackParamTraits<X7>::ForwardType x7) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X3>::ForwardType x3,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6,
-               typename CallbackParamTraits<X7>::ForwardType x7)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6), CallbackForward(x7));
-  }
-};
-
-// Arity 7 -> 4.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6, typename X7>
-struct Invoker<3, StorageType, R(X1, X2, X3, X4, X5, X6, X7)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X4>::ForwardType,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType,
-      typename CallbackParamTraits<X7>::ForwardType);
-
-  typedef R(UnboundRunType)(X4, X5, X6, X7);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X4>::ForwardType x4,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6,
-      typename CallbackParamTraits<X7>::ForwardType x7) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X4>::ForwardType x4,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6,
-               typename CallbackParamTraits<X7>::ForwardType x7)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6), CallbackForward(x7));
-  }
-};
-
-// Arity 7 -> 3.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6, typename X7>
-struct Invoker<4, StorageType, R(X1, X2, X3, X4, X5, X6, X7)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X5>::ForwardType,
-      typename CallbackParamTraits<X6>::ForwardType,
-      typename CallbackParamTraits<X7>::ForwardType);
-
-  typedef R(UnboundRunType)(X5, X6, X7);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X5>::ForwardType x5,
-      typename CallbackParamTraits<X6>::ForwardType x6,
-      typename CallbackParamTraits<X7>::ForwardType x7) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X5>::ForwardType x5,
-               typename CallbackParamTraits<X6>::ForwardType x6,
-               typename CallbackParamTraits<X7>::ForwardType x7)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6), CallbackForward(x7));
-  }
-};
-
-// Arity 7 -> 2.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6, typename X7>
-struct Invoker<5, StorageType, R(X1, X2, X3, X4, X5, X6, X7)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X6>::ForwardType,
-      typename CallbackParamTraits<X7>::ForwardType);
-
-  typedef R(UnboundRunType)(X6, X7);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X6>::ForwardType x6,
-      typename CallbackParamTraits<X7>::ForwardType x7) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-    typedef typename StorageType::Bound5UnwrapTraits Bound5UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    typename Bound5UnwrapTraits::ForwardType x5 =
-        Bound5UnwrapTraits::Unwrap(storage->p5_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename Bound5UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X6>::ForwardType x6,
-               typename CallbackParamTraits<X7>::ForwardType x7)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6), CallbackForward(x7));
-  }
-};
-
-// Arity 7 -> 1.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6, typename X7>
-struct Invoker<6, StorageType, R(X1, X2, X3, X4, X5, X6, X7)> {
-  typedef R(RunType)(BindStateBase*,
-      typename CallbackParamTraits<X7>::ForwardType);
-
-  typedef R(UnboundRunType)(X7);
-
-  static R Run(BindStateBase* base,
-      typename CallbackParamTraits<X7>::ForwardType x7) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-    typedef typename StorageType::Bound5UnwrapTraits Bound5UnwrapTraits;
-    typedef typename StorageType::Bound6UnwrapTraits Bound6UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    typename Bound5UnwrapTraits::ForwardType x5 =
-        Bound5UnwrapTraits::Unwrap(storage->p5_);
-    typename Bound6UnwrapTraits::ForwardType x6 =
-        Bound6UnwrapTraits::Unwrap(storage->p6_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename Bound5UnwrapTraits::ForwardType,
-               typename Bound6UnwrapTraits::ForwardType,
-               typename CallbackParamTraits<X7>::ForwardType x7)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6), CallbackForward(x7));
-  }
-};
-
-// Arity 7 -> 0.
-template <typename StorageType, typename R,typename X1, typename X2,
-    typename X3, typename X4, typename X5, typename X6, typename X7>
-struct Invoker<7, StorageType, R(X1, X2, X3, X4, X5, X6, X7)> {
-  typedef R(RunType)(BindStateBase*);
-
-  typedef R(UnboundRunType)();
-
-  static R Run(BindStateBase* base) {
-    StorageType* storage = static_cast<StorageType*>(base);
-
-    // Local references to make debugger stepping easier. If in a debugger,
-    // you really want to warp ahead and step through the
-    // InvokeHelper<>::MakeItSo() call below.
-    typedef typename StorageType::Bound1UnwrapTraits Bound1UnwrapTraits;
-    typedef typename StorageType::Bound2UnwrapTraits Bound2UnwrapTraits;
-    typedef typename StorageType::Bound3UnwrapTraits Bound3UnwrapTraits;
-    typedef typename StorageType::Bound4UnwrapTraits Bound4UnwrapTraits;
-    typedef typename StorageType::Bound5UnwrapTraits Bound5UnwrapTraits;
-    typedef typename StorageType::Bound6UnwrapTraits Bound6UnwrapTraits;
-    typedef typename StorageType::Bound7UnwrapTraits Bound7UnwrapTraits;
-
-    typename Bound1UnwrapTraits::ForwardType x1 =
-        Bound1UnwrapTraits::Unwrap(storage->p1_);
-    typename Bound2UnwrapTraits::ForwardType x2 =
-        Bound2UnwrapTraits::Unwrap(storage->p2_);
-    typename Bound3UnwrapTraits::ForwardType x3 =
-        Bound3UnwrapTraits::Unwrap(storage->p3_);
-    typename Bound4UnwrapTraits::ForwardType x4 =
-        Bound4UnwrapTraits::Unwrap(storage->p4_);
-    typename Bound5UnwrapTraits::ForwardType x5 =
-        Bound5UnwrapTraits::Unwrap(storage->p5_);
-    typename Bound6UnwrapTraits::ForwardType x6 =
-        Bound6UnwrapTraits::Unwrap(storage->p6_);
-    typename Bound7UnwrapTraits::ForwardType x7 =
-        Bound7UnwrapTraits::Unwrap(storage->p7_);
-    return InvokeHelper<StorageType::IsWeakCall::value, R,
-           typename StorageType::RunnableType,
-           void(typename Bound1UnwrapTraits::ForwardType,
-               typename Bound2UnwrapTraits::ForwardType,
-               typename Bound3UnwrapTraits::ForwardType,
-               typename Bound4UnwrapTraits::ForwardType,
-               typename Bound5UnwrapTraits::ForwardType,
-               typename Bound6UnwrapTraits::ForwardType,
-               typename Bound7UnwrapTraits::ForwardType)>
-               ::MakeItSo(storage->runnable_, CallbackForward(x1),
-                   CallbackForward(x2), CallbackForward(x3),
-                   CallbackForward(x4), CallbackForward(x5),
-                   CallbackForward(x6), CallbackForward(x7));
-  }
-};
-
-
-// BindState<>
-//
-// This stores all the state passed into Bind() and is also where most
-// of the template resolution magic occurs.
-//
-// Runnable is the functor we are binding arguments to.
-// RunType is type of the Run() function that the Invoker<> should use.
-// Normally, this is the same as the RunType of the Runnable, but it can
-// be different if an adapter like IgnoreResult() has been used.
-//
-// BoundArgsType contains the storage type for all the bound arguments by
-// (ab)using a function type.
-template <typename Runnable, typename RunType, typename BoundArgsType>
-struct BindState;
-
-template <typename Runnable, typename RunType>
-struct BindState<Runnable, RunType, void()> : public BindStateBase {
-  typedef Runnable RunnableType;
-  typedef false_type IsWeakCall;
-  typedef Invoker<0, BindState, RunType> InvokerType;
-  typedef typename InvokerType::UnboundRunType UnboundRunType;
-  explicit BindState(const Runnable& runnable)
-      : runnable_(runnable) {
-  }
-
-  virtual ~BindState() {  }
-
-  RunnableType runnable_;
-};
-
-template <typename Runnable, typename RunType, typename P1>
-struct BindState<Runnable, RunType, void(P1)> : public BindStateBase {
-  typedef Runnable RunnableType;
-  typedef IsWeakMethod<HasIsMethodTag<Runnable>::value, P1> IsWeakCall;
-  typedef Invoker<1, BindState, RunType> InvokerType;
-  typedef typename InvokerType::UnboundRunType UnboundRunType;
-
-  // Convenience typedefs for bound argument types.
-  typedef UnwrapTraits<P1> Bound1UnwrapTraits;
-
-  BindState(const Runnable& runnable, const P1& p1)
-      : runnable_(runnable),
-        p1_(p1) {
-    MaybeRefcount<HasIsMethodTag<Runnable>::value, P1>::AddRef(p1_);
-  }
-
-  virtual ~BindState() {    MaybeRefcount<HasIsMethodTag<Runnable>::value,
-      P1>::Release(p1_);  }
-
-  RunnableType runnable_;
-  P1 p1_;
-};
-
-template <typename Runnable, typename RunType, typename P1, typename P2>
-struct BindState<Runnable, RunType, void(P1, P2)> : public BindStateBase {
-  typedef Runnable RunnableType;
-  typedef IsWeakMethod<HasIsMethodTag<Runnable>::value, P1> IsWeakCall;
-  typedef Invoker<2, BindState, RunType> InvokerType;
-  typedef typename InvokerType::UnboundRunType UnboundRunType;
-
-  // Convenience typedefs for bound argument types.
-  typedef UnwrapTraits<P1> Bound1UnwrapTraits;
-  typedef UnwrapTraits<P2> Bound2UnwrapTraits;
-
-  BindState(const Runnable& runnable, const P1& p1, const P2& p2)
-      : runnable_(runnable),
-        p1_(p1),
-        p2_(p2) {
-    MaybeRefcount<HasIsMethodTag<Runnable>::value, P1>::AddRef(p1_);
-  }
-
-  virtual ~BindState() {    MaybeRefcount<HasIsMethodTag<Runnable>::value,
-      P1>::Release(p1_);  }
-
-  RunnableType runnable_;
-  P1 p1_;
-  P2 p2_;
-};
-
-template <typename Runnable, typename RunType, typename P1, typename P2,
-    typename P3>
-struct BindState<Runnable, RunType, void(P1, P2, P3)> : public BindStateBase {
-  typedef Runnable RunnableType;
-  typedef IsWeakMethod<HasIsMethodTag<Runnable>::value, P1> IsWeakCall;
-  typedef Invoker<3, BindState, RunType> InvokerType;
-  typedef typename InvokerType::UnboundRunType UnboundRunType;
-
-  // Convenience typedefs for bound argument types.
-  typedef UnwrapTraits<P1> Bound1UnwrapTraits;
-  typedef UnwrapTraits<P2> Bound2UnwrapTraits;
-  typedef UnwrapTraits<P3> Bound3UnwrapTraits;
-
-  BindState(const Runnable& runnable, const P1& p1, const P2& p2, const P3& p3)
-      : runnable_(runnable),
-        p1_(p1),
-        p2_(p2),
-        p3_(p3) {
-    MaybeRefcount<HasIsMethodTag<Runnable>::value, P1>::AddRef(p1_);
-  }
-
-  virtual ~BindState() {    MaybeRefcount<HasIsMethodTag<Runnable>::value,
-      P1>::Release(p1_);  }
-
-  RunnableType runnable_;
-  P1 p1_;
-  P2 p2_;
-  P3 p3_;
-};
-
-template <typename Runnable, typename RunType, typename P1, typename P2,
-    typename P3, typename P4>
-struct BindState<Runnable, RunType, void(P1, P2, P3,
-    P4)> : public BindStateBase {
-  typedef Runnable RunnableType;
-  typedef IsWeakMethod<HasIsMethodTag<Runnable>::value, P1> IsWeakCall;
-  typedef Invoker<4, BindState, RunType> InvokerType;
-  typedef typename InvokerType::UnboundRunType UnboundRunType;
-
-  // Convenience typedefs for bound argument types.
-  typedef UnwrapTraits<P1> Bound1UnwrapTraits;
-  typedef UnwrapTraits<P2> Bound2UnwrapTraits;
-  typedef UnwrapTraits<P3> Bound3UnwrapTraits;
-  typedef UnwrapTraits<P4> Bound4UnwrapTraits;
-
-  BindState(const Runnable& runnable, const P1& p1, const P2& p2, const P3& p3,
-      const P4& p4)
-      : runnable_(runnable),
-        p1_(p1),
-        p2_(p2),
-        p3_(p3),
-        p4_(p4) {
-    MaybeRefcount<HasIsMethodTag<Runnable>::value, P1>::AddRef(p1_);
-  }
-
-  virtual ~BindState() {    MaybeRefcount<HasIsMethodTag<Runnable>::value,
-      P1>::Release(p1_);  }
-
-  RunnableType runnable_;
-  P1 p1_;
-  P2 p2_;
-  P3 p3_;
-  P4 p4_;
-};
-
-template <typename Runnable, typename RunType, typename P1, typename P2,
-    typename P3, typename P4, typename P5>
-struct BindState<Runnable, RunType, void(P1, P2, P3, P4,
-    P5)> : public BindStateBase {
-  typedef Runnable RunnableType;
-  typedef IsWeakMethod<HasIsMethodTag<Runnable>::value, P1> IsWeakCall;
-  typedef Invoker<5, BindState, RunType> InvokerType;
-  typedef typename InvokerType::UnboundRunType UnboundRunType;
-
-  // Convenience typedefs for bound argument types.
-  typedef UnwrapTraits<P1> Bound1UnwrapTraits;
-  typedef UnwrapTraits<P2> Bound2UnwrapTraits;
-  typedef UnwrapTraits<P3> Bound3UnwrapTraits;
-  typedef UnwrapTraits<P4> Bound4UnwrapTraits;
-  typedef UnwrapTraits<P5> Bound5UnwrapTraits;
-
-  BindState(const Runnable& runnable, const P1& p1, const P2& p2, const P3& p3,
-      const P4& p4, const P5& p5)
-      : runnable_(runnable),
-        p1_(p1),
-        p2_(p2),
-        p3_(p3),
-        p4_(p4),
-        p5_(p5) {
-    MaybeRefcount<HasIsMethodTag<Runnable>::value, P1>::AddRef(p1_);
-  }
-
-  virtual ~BindState() {    MaybeRefcount<HasIsMethodTag<Runnable>::value,
-      P1>::Release(p1_);  }
-
-  RunnableType runnable_;
-  P1 p1_;
-  P2 p2_;
-  P3 p3_;
-  P4 p4_;
-  P5 p5_;
-};
-
-template <typename Runnable, typename RunType, typename P1, typename P2,
-    typename P3, typename P4, typename P5, typename P6>
-struct BindState<Runnable, RunType, void(P1, P2, P3, P4, P5,
-    P6)> : public BindStateBase {
-  typedef Runnable RunnableType;
-  typedef IsWeakMethod<HasIsMethodTag<Runnable>::value, P1> IsWeakCall;
-  typedef Invoker<6, BindState, RunType> InvokerType;
-  typedef typename InvokerType::UnboundRunType UnboundRunType;
-
-  // Convenience typedefs for bound argument types.
-  typedef UnwrapTraits<P1> Bound1UnwrapTraits;
-  typedef UnwrapTraits<P2> Bound2UnwrapTraits;
-  typedef UnwrapTraits<P3> Bound3UnwrapTraits;
-  typedef UnwrapTraits<P4> Bound4UnwrapTraits;
-  typedef UnwrapTraits<P5> Bound5UnwrapTraits;
-  typedef UnwrapTraits<P6> Bound6UnwrapTraits;
-
-  BindState(const Runnable& runnable, const P1& p1, const P2& p2, const P3& p3,
-      const P4& p4, const P5& p5, const P6& p6)
-      : runnable_(runnable),
-        p1_(p1),
-        p2_(p2),
-        p3_(p3),
-        p4_(p4),
-        p5_(p5),
-        p6_(p6) {
-    MaybeRefcount<HasIsMethodTag<Runnable>::value, P1>::AddRef(p1_);
-  }
-
-  virtual ~BindState() {    MaybeRefcount<HasIsMethodTag<Runnable>::value,
-      P1>::Release(p1_);  }
-
-  RunnableType runnable_;
-  P1 p1_;
-  P2 p2_;
-  P3 p3_;
-  P4 p4_;
-  P5 p5_;
-  P6 p6_;
-};
-
-template <typename Runnable, typename RunType, typename P1, typename P2,
-    typename P3, typename P4, typename P5, typename P6, typename P7>
-struct BindState<Runnable, RunType, void(P1, P2, P3, P4, P5, P6,
-    P7)> : public BindStateBase {
-  typedef Runnable RunnableType;
-  typedef IsWeakMethod<HasIsMethodTag<Runnable>::value, P1> IsWeakCall;
-  typedef Invoker<7, BindState, RunType> InvokerType;
-  typedef typename InvokerType::UnboundRunType UnboundRunType;
-
-  // Convenience typedefs for bound argument types.
-  typedef UnwrapTraits<P1> Bound1UnwrapTraits;
-  typedef UnwrapTraits<P2> Bound2UnwrapTraits;
-  typedef UnwrapTraits<P3> Bound3UnwrapTraits;
-  typedef UnwrapTraits<P4> Bound4UnwrapTraits;
-  typedef UnwrapTraits<P5> Bound5UnwrapTraits;
-  typedef UnwrapTraits<P6> Bound6UnwrapTraits;
-  typedef UnwrapTraits<P7> Bound7UnwrapTraits;
-
-  BindState(const Runnable& runnable, const P1& p1, const P2& p2, const P3& p3,
-      const P4& p4, const P5& p5, const P6& p6, const P7& p7)
-      : runnable_(runnable),
-        p1_(p1),
-        p2_(p2),
-        p3_(p3),
-        p4_(p4),
-        p5_(p5),
-        p6_(p6),
-        p7_(p7) {
-    MaybeRefcount<HasIsMethodTag<Runnable>::value, P1>::AddRef(p1_);
-  }
+  typedef Tuple<BoundArgs...> BoundType;
 
-  virtual ~BindState() {    MaybeRefcount<HasIsMethodTag<Runnable>::value,
-      P1>::Release(p1_);  }
+  BindState(const Runnable& runnable, const BoundArgs&... bound_args)
+      : runnable_(runnable), ref_(bound_args...), bound_args_(bound_args...) {}
+  virtual ~BindState() {}
 
   RunnableType runnable_;
-  P1 p1_;
-  P2 p2_;
-  P3 p3_;
-  P4 p4_;
-  P5 p5_;
-  P6 p6_;
-  P7 p7_;
+  MaybeScopedRefPtr<HasIsMethodTag<Runnable>::value, BoundArgs...> ref_;
+  BoundType bound_args_;
 };
 
 }  // namespace internal