Callback: Replumb the type-inference.

base/callback.h

 // This file was GENERATED by command:
 //     pump.py callback.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.
 
 #ifndef BASE_CALLBACK_H_
@@ skipping 203 matching lines @@
 
 // First, we forward declare the Callback class template. This informs the
 // compiler that the template only has 1 type parameter which is the function
 // signature that the Callback is representing.
 //
 // After this, create template specializations for 0-6 parameters. Note that
 // even though the template typelist grows, the specialization still
 // only has one type: the function signature.
 template <typename Sig>
 class Callback;
+
 template <typename R>
 class Callback<R(void)> : public internal::CallbackBase {
  public:
   typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
   // We pass InvokerStorageHolder by const ref to avoid incurring an
   // unnecessary AddRef/Unref pair even though we will modify the object.
   // We cannot use a normal reference because the compiler will warn
   // since this is often used on a return value, which is a temporary.
   //
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename T>
   Callback(const internal::InvokerStorageHolder<T>& invoker_holder)
       : CallbackBase(
-          reinterpret_cast<InvokeFuncStorage>(&T::FunctionTraits::DoInvoke),
+          reinterpret_cast<InvokeFuncStorage>(&T::Invoker::DoInvoke),
           &invoker_holder.invoker_storage_) {
   }
 
   R Run() const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
     return f(invoker_storage_.get());
   }
 };
 
 template <typename R, typename A1>
 class Callback<R(A1)> : public internal::CallbackBase {
  public:
   typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*, const A1&);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
   // We pass InvokerStorageHolder by const ref to avoid incurring an
   // unnecessary AddRef/Unref pair even though we will modify the object.
   // We cannot use a normal reference because the compiler will warn
   // since this is often used on a return value, which is a temporary.
   //
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename T>
   Callback(const internal::InvokerStorageHolder<T>& invoker_holder)
       : CallbackBase(
-          reinterpret_cast<InvokeFuncStorage>(&T::FunctionTraits::DoInvoke),
+          reinterpret_cast<InvokeFuncStorage>(&T::Invoker::DoInvoke),
           &invoker_holder.invoker_storage_) {
   }
 
   R Run(const A1& a1) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
     return f(invoker_storage_.get(), a1);
   }
 };
 
 template <typename R, typename A1, typename A2>
 class Callback<R(A1, A2)> : public internal::CallbackBase {
  public:
   typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*, const A1&,
                                 const A2&);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
   // We pass InvokerStorageHolder by const ref to avoid incurring an
   // unnecessary AddRef/Unref pair even though we will modify the object.
   // We cannot use a normal reference because the compiler will warn
   // since this is often used on a return value, which is a temporary.
   //
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename T>
   Callback(const internal::InvokerStorageHolder<T>& invoker_holder)
       : CallbackBase(
-          reinterpret_cast<InvokeFuncStorage>(&T::FunctionTraits::DoInvoke),
+          reinterpret_cast<InvokeFuncStorage>(&T::Invoker::DoInvoke),
           &invoker_holder.invoker_storage_) {
   }
 
   R Run(const A1& a1,
         const A2& a2) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
     return f(invoker_storage_.get(), a1,
              a2);
@@ skipping 12 matching lines @@
   // We pass InvokerStorageHolder by const ref to avoid incurring an
   // unnecessary AddRef/Unref pair even though we will modify the object.
   // We cannot use a normal reference because the compiler will warn
   // since this is often used on a return value, which is a temporary.
   //
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename T>
   Callback(const internal::InvokerStorageHolder<T>& invoker_holder)
       : CallbackBase(
-          reinterpret_cast<InvokeFuncStorage>(&T::FunctionTraits::DoInvoke),
+          reinterpret_cast<InvokeFuncStorage>(&T::Invoker::DoInvoke),
           &invoker_holder.invoker_storage_) {
   }
 
   R Run(const A1& a1,
         const A2& a2,
         const A3& a3) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
     return f(invoker_storage_.get(), a1,
@@ skipping 15 matching lines @@
   // We pass InvokerStorageHolder by const ref to avoid incurring an
   // unnecessary AddRef/Unref pair even though we will modify the object.
   // We cannot use a normal reference because the compiler will warn
   // since this is often used on a return value, which is a temporary.
   //
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename T>
   Callback(const internal::InvokerStorageHolder<T>& invoker_holder)
       : CallbackBase(
-          reinterpret_cast<InvokeFuncStorage>(&T::FunctionTraits::DoInvoke),
+          reinterpret_cast<InvokeFuncStorage>(&T::Invoker::DoInvoke),
           &invoker_holder.invoker_storage_) {
   }
 
   R Run(const A1& a1,
         const A2& a2,
         const A3& a3,
         const A4& a4) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
@@ skipping 19 matching lines @@
   // We pass InvokerStorageHolder by const ref to avoid incurring an
   // unnecessary AddRef/Unref pair even though we will modify the object.
   // We cannot use a normal reference because the compiler will warn
   // since this is often used on a return value, which is a temporary.
   //
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename T>
   Callback(const internal::InvokerStorageHolder<T>& invoker_holder)
       : CallbackBase(
-          reinterpret_cast<InvokeFuncStorage>(&T::FunctionTraits::DoInvoke),
+          reinterpret_cast<InvokeFuncStorage>(&T::Invoker::DoInvoke),
           &invoker_holder.invoker_storage_) {
   }
 
   R Run(const A1& a1,
         const A2& a2,
         const A3& a3,
         const A4& a4,
         const A5& a5) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
@@ skipping 22 matching lines @@
   // We pass InvokerStorageHolder by const ref to avoid incurring an
   // unnecessary AddRef/Unref pair even though we will modify the object.
   // We cannot use a normal reference because the compiler will warn
   // since this is often used on a return value, which is a temporary.
   //
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename T>
   Callback(const internal::InvokerStorageHolder<T>& invoker_holder)
       : CallbackBase(
-          reinterpret_cast<InvokeFuncStorage>(&T::FunctionTraits::DoInvoke),
+          reinterpret_cast<InvokeFuncStorage>(&T::Invoker::DoInvoke),
           &invoker_holder.invoker_storage_) {
   }
 
   R Run(const A1& a1,
         const A2& a2,
         const A3& a3,
         const A4& a4,
         const A5& a5,
         const A6& a6) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
     return f(invoker_storage_.get(), a1,
              a2,
              a3,
              a4,
              a5,
              a6);
   }
 };
 
 
 // Syntactic sugar to make Callbacks<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