Revert of Revert of [Base] Use variadic template in callback_list.h (wave 1)

base/callback_list.h

Index: base/callback_list.h
diff --git a/base/callback_list.h b/base/callback_list.h
index 5b911fd4867e1bec80ce002c57fd5d58b129247b..aeed5f1e2216211df27e66760a4b2ef2de436ad3 100644
--- a/base/callback_list.h
+++ b/base/callback_list.h
@@ -1,8 +1,3 @@
-// This file was GENERATED by command:
-//     pump.py callback_list.h.pump
-// DO NOT EDIT BY HAND!!!
-
-
 // Copyright 2013 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.
@@ -208,41 +203,21 @@
 
 template <typename Sig> class CallbackList;
 
-template <>
-class CallbackList<void(void)>
-    : public internal::CallbackListBase<Callback<void(void)> > {
+template <typename... Args>
+class CallbackList<void(Args...)>
+    : public internal::CallbackListBase<Callback<void(Args...)> > {
  public:
-  typedef Callback<void(void)> CallbackType;
+  typedef Callback<void(Args...)> CallbackType;
 
   CallbackList() {}
 
-  void Notify() {
-    internal::CallbackListBase<CallbackType>::Iterator it =
-        this->GetIterator();
-    CallbackType* cb;
-    while ((cb = it.GetNext()) != NULL) {
-      cb->Run();
-    }
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CallbackList);
-};
-
-template <typename A1>
-class CallbackList<void(A1)>
-    : public internal::CallbackListBase<Callback<void(A1)> > {
- public:
-  typedef Callback<void(A1)> CallbackType;
-
-  CallbackList() {}
-
-  void Notify(typename internal::CallbackParamTraits<A1>::ForwardType a1) {
+  void Notify(
+      typename internal::CallbackParamTraits<Args>::ForwardType... args) {
     typename internal::CallbackListBase<CallbackType>::Iterator it =
         this->GetIterator();
     CallbackType* cb;
     while ((cb = it.GetNext()) != NULL) {
-      cb->Run(a1);
+      cb->Run(args...);
     }
   }
 
@@ -250,157 +225,6 @@
   DISALLOW_COPY_AND_ASSIGN(CallbackList);
 };
 
-template <typename A1, typename A2>
-class CallbackList<void(A1, A2)>
-    : public internal::CallbackListBase<Callback<void(A1, A2)> > {
- public:
-  typedef Callback<void(A1, A2)> CallbackType;
-
-  CallbackList() {}
-
-  void Notify(typename internal::CallbackParamTraits<A1>::ForwardType a1,
-              typename internal::CallbackParamTraits<A2>::ForwardType a2) {
-    typename internal::CallbackListBase<CallbackType>::Iterator it =
-        this->GetIterator();
-    CallbackType* cb;
-    while ((cb = it.GetNext()) != NULL) {
-      cb->Run(a1, a2);
-    }
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CallbackList);
-};
-
-template <typename A1, typename A2, typename A3>
-class CallbackList<void(A1, A2, A3)>
-    : public internal::CallbackListBase<Callback<void(A1, A2, A3)> > {
- public:
-  typedef Callback<void(A1, A2, A3)> CallbackType;
-
-  CallbackList() {}
-
-  void Notify(typename internal::CallbackParamTraits<A1>::ForwardType a1,
-              typename internal::CallbackParamTraits<A2>::ForwardType a2,
-              typename internal::CallbackParamTraits<A3>::ForwardType a3) {
-    typename internal::CallbackListBase<CallbackType>::Iterator it =
-        this->GetIterator();
-    CallbackType* cb;
-    while ((cb = it.GetNext()) != NULL) {
-      cb->Run(a1, a2, a3);
-    }
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CallbackList);
-};
-
-template <typename A1, typename A2, typename A3, typename A4>
-class CallbackList<void(A1, A2, A3, A4)>
-    : public internal::CallbackListBase<Callback<void(A1, A2, A3, A4)> > {
- public:
-  typedef Callback<void(A1, A2, A3, A4)> CallbackType;
-
-  CallbackList() {}
-
-  void Notify(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::CallbackListBase<CallbackType>::Iterator it =
-        this->GetIterator();
-    CallbackType* cb;
-    while ((cb = it.GetNext()) != NULL) {
-      cb->Run(a1, a2, a3, a4);
-    }
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CallbackList);
-};
-
-template <typename A1, typename A2, typename A3, typename A4, typename A5>
-class CallbackList<void(A1, A2, A3, A4, A5)>
-    : public internal::CallbackListBase<Callback<void(A1, A2, A3, A4, A5)> > {
- public:
-  typedef Callback<void(A1, A2, A3, A4, A5)> CallbackType;
-
-  CallbackList() {}
-
-  void Notify(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::CallbackListBase<CallbackType>::Iterator it =
-        this->GetIterator();
-    CallbackType* cb;
-    while ((cb = it.GetNext()) != NULL) {
-      cb->Run(a1, a2, a3, a4, a5);
-    }
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CallbackList);
-};
-
-template <typename A1, typename A2, typename A3, typename A4, typename A5,
-    typename A6>
-class CallbackList<void(A1, A2, A3, A4, A5, A6)>
-    : public internal::CallbackListBase<Callback<void(A1, A2, A3, A4, A5,
-        A6)> > {
- public:
-  typedef Callback<void(A1, A2, A3, A4, A5, A6)> CallbackType;
-
-  CallbackList() {}
-
-  void Notify(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::CallbackListBase<CallbackType>::Iterator it =
-        this->GetIterator();
-    CallbackType* cb;
-    while ((cb = it.GetNext()) != NULL) {
-      cb->Run(a1, a2, a3, a4, a5, a6);
-    }
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CallbackList);
-};
-
-template <typename A1, typename A2, typename A3, typename A4, typename A5,
-    typename A6, typename A7>
-class CallbackList<void(A1, A2, A3, A4, A5, A6, A7)>
-    : public internal::CallbackListBase<Callback<void(A1, A2, A3, A4, A5, A6,
-        A7)> > {
- public:
-  typedef Callback<void(A1, A2, A3, A4, A5, A6, A7)> CallbackType;
-
-  CallbackList() {}
-
-  void Notify(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) {
-    typename internal::CallbackListBase<CallbackType>::Iterator it =
-        this->GetIterator();
-    CallbackType* cb;
-    while ((cb = it.GetNext()) != NULL) {
-      cb->Run(a1, a2, a3, a4, a5, a6, a7);
-    }
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CallbackList);
-};
-
 }  // namespace base
 
 #endif  // BASE_CALLBACK_LIST_H_