[Base] Use variadic template in base/callback.h (wave 1)

base/callback.h

Index: base/callback.h
diff --git a/base/callback.h b/base/callback.h
index 364f506139f66652aff19669e02d281e6d8bc9fb..00669dd83d1c2dbb518134f0243fd5dbec104133 100644
--- a/base/callback.h
+++ b/base/callback.h
@@ -1,8 +1,3 @@
-// This file was GENERATED by command:
-//     pump.py callback.h.pump
-// DO NOT EDIT BY HAND!!!
-
-
 // Copyright (c) 2012 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.
@@ -367,10 +362,10 @@ template <typename Runnable, typename RunType, typename BoundArgsType>
 struct BindState;
 }  // namespace internal
 
-template <typename R>
-class Callback<R(void)> : public internal::CallbackBase {
+template <typename R, typename... Args>
+class Callback<R(Args...)> : public internal::CallbackBase {
  public:
-  typedef R(RunType)();
+  typedef R(RunType)(Args...);
 
   Callback() : CallbackBase(NULL) { }
 
@@ -380,7 +375,6 @@ class Callback<R(void)> : public internal::CallbackBase {
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
-
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
@@ -394,377 +388,24 @@ class Callback<R(void)> : public internal::CallbackBase {
     return CallbackBase::Equals(other);
   }
 
-  R Run() const {
+  R Run(typename internal::CallbackParamTraits<Args>::ForwardType... args)
+      const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
-    return f(bind_state_.get());
-  }
-
- private:
-  typedef R(*PolymorphicInvoke)(
-      internal::BindStateBase*);
-
-};
-
-template <typename R, typename A1>
-class Callback<R(A1)> : public internal::CallbackBase {
- public:
-  typedef R(RunType)(A1);
-
-  Callback() : CallbackBase(NULL) { }
-
-  // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
-  // return the exact Callback<> type.  See base/bind.h for details.
-  template <typename Runnable, typename BindRunType, typename BoundArgsType>
-  Callback(internal::BindState<Runnable, BindRunType,
-           BoundArgsType>* bind_state)
-      : CallbackBase(bind_state) {
-
-    // Force the assignment to a local variable of PolymorphicInvoke
-    // so the compiler will typecheck that the passed in Run() method has
-    // the correct type.
-    PolymorphicInvoke invoke_func =
-        &internal::BindState<Runnable, BindRunType, BoundArgsType>
-            ::InvokerType::Run;
-    polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
-  }
-
-  bool Equals(const Callback& other) const {
-    return CallbackBase::Equals(other);
-  }
-
-  R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1) const {
-    PolymorphicInvoke f =
-        reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
-
-    return f(bind_state_.get(), internal::CallbackForward(a1));
+    return f(bind_state_.get(), internal::CallbackForward(args)...);
   }
 
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*,
-          typename internal::CallbackParamTraits<A1>::ForwardType);
-
+      typename internal::CallbackParamTraits<Args>::ForwardType...);
 };
 
-template <typename R, typename A1, typename A2>
-class Callback<R(A1, A2)> : public internal::CallbackBase {
- public:
-  typedef R(RunType)(A1, A2);
-
-  Callback() : CallbackBase(NULL) { }
-
-  // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
-  // return the exact Callback<> type.  See base/bind.h for details.
-  template <typename Runnable, typename BindRunType, typename BoundArgsType>
-  Callback(internal::BindState<Runnable, BindRunType,
-           BoundArgsType>* bind_state)
-      : CallbackBase(bind_state) {
-
-    // Force the assignment to a local variable of PolymorphicInvoke
-    // so the compiler will typecheck that the passed in Run() method has
-    // the correct type.
-    PolymorphicInvoke invoke_func =
-        &internal::BindState<Runnable, BindRunType, BoundArgsType>
-            ::InvokerType::Run;
-    polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
-  }
-
-  bool Equals(const Callback& other) const {
-    return CallbackBase::Equals(other);
-  }
-
-  R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
-        typename internal::CallbackParamTraits<A2>::ForwardType a2) const {
-    PolymorphicInvoke f =
-        reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
-
-    return f(bind_state_.get(), internal::CallbackForward(a1),
-             internal::CallbackForward(a2));
-  }
-
- private:
-  typedef R(*PolymorphicInvoke)(
-      internal::BindStateBase*,
-          typename internal::CallbackParamTraits<A1>::ForwardType,
-          typename internal::CallbackParamTraits<A2>::ForwardType);
-
-};
-
-template <typename R, typename A1, typename A2, typename A3>
-class Callback<R(A1, A2, A3)> : public internal::CallbackBase {
- public:
-  typedef R(RunType)(A1, A2, A3);
-
-  Callback() : CallbackBase(NULL) { }
-
-  // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
-  // return the exact Callback<> type.  See base/bind.h for details.
-  template <typename Runnable, typename BindRunType, typename BoundArgsType>
-  Callback(internal::BindState<Runnable, BindRunType,
-           BoundArgsType>* bind_state)
-      : CallbackBase(bind_state) {
-
-    // Force the assignment to a local variable of PolymorphicInvoke
-    // so the compiler will typecheck that the passed in Run() method has
-    // the correct type.
-    PolymorphicInvoke invoke_func =
-        &internal::BindState<Runnable, BindRunType, BoundArgsType>
-            ::InvokerType::Run;
-    polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
-  }
-
-  bool Equals(const Callback& other) const {
-    return CallbackBase::Equals(other);
-  }
-
-  R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
-        typename internal::CallbackParamTraits<A2>::ForwardType a2,
-        typename internal::CallbackParamTraits<A3>::ForwardType a3) const {
-    PolymorphicInvoke f =
-        reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
-
-    return f(bind_state_.get(), internal::CallbackForward(a1),
-             internal::CallbackForward(a2),
-             internal::CallbackForward(a3));
-  }
-
- private:
-  typedef R(*PolymorphicInvoke)(
-      internal::BindStateBase*,
-          typename internal::CallbackParamTraits<A1>::ForwardType,
-          typename internal::CallbackParamTraits<A2>::ForwardType,
-          typename internal::CallbackParamTraits<A3>::ForwardType);
-
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4>
-class Callback<R(A1, A2, A3, A4)> : public internal::CallbackBase {
- public:
-  typedef R(RunType)(A1, A2, A3, A4);
-
-  Callback() : CallbackBase(NULL) { }
-
-  // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
-  // return the exact Callback<> type.  See base/bind.h for details.
-  template <typename Runnable, typename BindRunType, typename BoundArgsType>
-  Callback(internal::BindState<Runnable, BindRunType,
-           BoundArgsType>* bind_state)
-      : CallbackBase(bind_state) {
-
-    // Force the assignment to a local variable of PolymorphicInvoke
-    // so the compiler will typecheck that the passed in Run() method has
-    // the correct type.
-    PolymorphicInvoke invoke_func =
-        &internal::BindState<Runnable, BindRunType, BoundArgsType>
-            ::InvokerType::Run;
-    polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
-  }
-
-  bool Equals(const Callback& other) const {
-    return CallbackBase::Equals(other);
-  }
-
-  R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
-        typename internal::CallbackParamTraits<A2>::ForwardType a2,
-        typename internal::CallbackParamTraits<A3>::ForwardType a3,
-        typename internal::CallbackParamTraits<A4>::ForwardType a4) const {
-    PolymorphicInvoke f =
-        reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
-
-    return f(bind_state_.get(), internal::CallbackForward(a1),
-             internal::CallbackForward(a2),
-             internal::CallbackForward(a3),
-             internal::CallbackForward(a4));
-  }
-
- private:
-  typedef R(*PolymorphicInvoke)(
-      internal::BindStateBase*,
-          typename internal::CallbackParamTraits<A1>::ForwardType,
-          typename internal::CallbackParamTraits<A2>::ForwardType,
-          typename internal::CallbackParamTraits<A3>::ForwardType,
-          typename internal::CallbackParamTraits<A4>::ForwardType);
-
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5>
-class Callback<R(A1, A2, A3, A4, A5)> : public internal::CallbackBase {
- public:
-  typedef R(RunType)(A1, A2, A3, A4, A5);
-
-  Callback() : CallbackBase(NULL) { }
-
-  // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
-  // return the exact Callback<> type.  See base/bind.h for details.
-  template <typename Runnable, typename BindRunType, typename BoundArgsType>
-  Callback(internal::BindState<Runnable, BindRunType,
-           BoundArgsType>* bind_state)
-      : CallbackBase(bind_state) {
-
-    // Force the assignment to a local variable of PolymorphicInvoke
-    // so the compiler will typecheck that the passed in Run() method has
-    // the correct type.
-    PolymorphicInvoke invoke_func =
-        &internal::BindState<Runnable, BindRunType, BoundArgsType>
-            ::InvokerType::Run;
-    polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
-  }
-
-  bool Equals(const Callback& other) const {
-    return CallbackBase::Equals(other);
-  }
-
-  R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
-        typename internal::CallbackParamTraits<A2>::ForwardType a2,
-        typename internal::CallbackParamTraits<A3>::ForwardType a3,
-        typename internal::CallbackParamTraits<A4>::ForwardType a4,
-        typename internal::CallbackParamTraits<A5>::ForwardType a5) const {
-    PolymorphicInvoke f =
-        reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
-
-    return f(bind_state_.get(), internal::CallbackForward(a1),
-             internal::CallbackForward(a2),
-             internal::CallbackForward(a3),
-             internal::CallbackForward(a4),
-             internal::CallbackForward(a5));
-  }
-
- private:
-  typedef R(*PolymorphicInvoke)(
-      internal::BindStateBase*,
-          typename internal::CallbackParamTraits<A1>::ForwardType,
-          typename internal::CallbackParamTraits<A2>::ForwardType,
-          typename internal::CallbackParamTraits<A3>::ForwardType,
-          typename internal::CallbackParamTraits<A4>::ForwardType,
-          typename internal::CallbackParamTraits<A5>::ForwardType);
-
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6>
-class Callback<R(A1, A2, A3, A4, A5, A6)> : public internal::CallbackBase {
- public:
-  typedef R(RunType)(A1, A2, A3, A4, A5, A6);
-
-  Callback() : CallbackBase(NULL) { }
-
-  // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
-  // return the exact Callback<> type.  See base/bind.h for details.
-  template <typename Runnable, typename BindRunType, typename BoundArgsType>
-  Callback(internal::BindState<Runnable, BindRunType,
-           BoundArgsType>* bind_state)
-      : CallbackBase(bind_state) {
-
-    // Force the assignment to a local variable of PolymorphicInvoke
-    // so the compiler will typecheck that the passed in Run() method has
-    // the correct type.
-    PolymorphicInvoke invoke_func =
-        &internal::BindState<Runnable, BindRunType, BoundArgsType>
-            ::InvokerType::Run;
-    polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
-  }
-
-  bool Equals(const Callback& other) const {
-    return CallbackBase::Equals(other);
-  }
-
-  R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
-        typename internal::CallbackParamTraits<A2>::ForwardType a2,
-        typename internal::CallbackParamTraits<A3>::ForwardType a3,
-        typename internal::CallbackParamTraits<A4>::ForwardType a4,
-        typename internal::CallbackParamTraits<A5>::ForwardType a5,
-        typename internal::CallbackParamTraits<A6>::ForwardType a6) const {
-    PolymorphicInvoke f =
-        reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
-
-    return f(bind_state_.get(), internal::CallbackForward(a1),
-             internal::CallbackForward(a2),
-             internal::CallbackForward(a3),
-             internal::CallbackForward(a4),
-             internal::CallbackForward(a5),
-             internal::CallbackForward(a6));
-  }
-
- private:
-  typedef R(*PolymorphicInvoke)(
-      internal::BindStateBase*,
-          typename internal::CallbackParamTraits<A1>::ForwardType,
-          typename internal::CallbackParamTraits<A2>::ForwardType,
-          typename internal::CallbackParamTraits<A3>::ForwardType,
-          typename internal::CallbackParamTraits<A4>::ForwardType,
-          typename internal::CallbackParamTraits<A5>::ForwardType,
-          typename internal::CallbackParamTraits<A6>::ForwardType);
-
-};
-
-template <typename R, typename A1, typename A2, typename A3, typename A4,
-    typename A5, typename A6, typename A7>
-class Callback<R(A1, A2, A3, A4, A5, A6, A7)> : public internal::CallbackBase {
- public:
-  typedef R(RunType)(A1, A2, A3, A4, A5, A6, A7);
-
-  Callback() : CallbackBase(NULL) { }
-
-  // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
-  // return the exact Callback<> type.  See base/bind.h for details.
-  template <typename Runnable, typename BindRunType, typename BoundArgsType>
-  Callback(internal::BindState<Runnable, BindRunType,
-           BoundArgsType>* bind_state)
-      : CallbackBase(bind_state) {
-
-    // Force the assignment to a local variable of PolymorphicInvoke
-    // so the compiler will typecheck that the passed in Run() method has
-    // the correct type.
-    PolymorphicInvoke invoke_func =
-        &internal::BindState<Runnable, BindRunType, BoundArgsType>
-            ::InvokerType::Run;
-    polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
-  }
-
-  bool Equals(const Callback& other) const {
-    return CallbackBase::Equals(other);
-  }
-
-  R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
-        typename internal::CallbackParamTraits<A2>::ForwardType a2,
-        typename internal::CallbackParamTraits<A3>::ForwardType a3,
-        typename internal::CallbackParamTraits<A4>::ForwardType a4,
-        typename internal::CallbackParamTraits<A5>::ForwardType a5,
-        typename internal::CallbackParamTraits<A6>::ForwardType a6,
-        typename internal::CallbackParamTraits<A7>::ForwardType a7) const {
-    PolymorphicInvoke f =
-        reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
-
-    return f(bind_state_.get(), internal::CallbackForward(a1),
-             internal::CallbackForward(a2),
-             internal::CallbackForward(a3),
-             internal::CallbackForward(a4),
-             internal::CallbackForward(a5),
-             internal::CallbackForward(a6),
-             internal::CallbackForward(a7));
-  }
-
- private:
-  typedef R(*PolymorphicInvoke)(
-      internal::BindStateBase*,
-          typename internal::CallbackParamTraits<A1>::ForwardType,
-          typename internal::CallbackParamTraits<A2>::ForwardType,
-          typename internal::CallbackParamTraits<A3>::ForwardType,
-          typename internal::CallbackParamTraits<A4>::ForwardType,
-          typename internal::CallbackParamTraits<A5>::ForwardType,
-          typename internal::CallbackParamTraits<A6>::ForwardType,
-          typename internal::CallbackParamTraits<A7>::ForwardType);
-
-};
-
-
 // Syntactic sugar to make Callback<void(void)> easier to declare since it
 // will be used in a lot of APIs with delayed execution.
 typedef Callback<void(void)> Closure;
 
 }  // namespace base
 
-#endif  // BASE_CALLBACK_H
+#endif  // BASE_CALLBACK_H_

[awong, 2014/10/07 18:45:39]

Oooh...nice catch.