Use variadic template in media::BindToCurrentLoop()

media/base/bind_to_current_loop.h

-// This file was GENERATED by command:
-//     pump.py bind_to_current_loop.h.pump
-// DO NOT EDIT BY HAND!!!
-
-
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2015 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 MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_
 #define MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 20 matching lines @@
 T& TrampolineForward(T& t) { return t; }
 
 template <typename T, typename R>
 base::internal::PassedWrapper<scoped_ptr<T, R> > TrampolineForward(
     scoped_ptr<T, R>& p) { return base::Passed(&p); }
 
 template <typename T>
 base::internal::PassedWrapper<ScopedVector<T> > TrampolineForward(
     ScopedVector<T>& p) { return base::Passed(&p); }
 
-template <typename T> struct TrampolineHelper;
+// First, tell the compiler TrampolineHelper is a struct template with one
+// type parameter.  Then define specializations where the type is a function
+// returning void and taking zero or more arguments.
+template <typename Sig> struct TrampolineHelper;
 
-template <>
-struct TrampolineHelper<void()> {
+template <typename... Args>
+struct TrampolineHelper<void(Args...)> {
   static void Run(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void()>& cb) {
-    task_runner->PostTask(FROM_HERE, base::Bind(cb));
+      const base::Callback<void(Args...)>& cb,
+      Args... args) {
+    task_runner->PostTask(FROM_HERE,
+                          base::Bind(cb, TrampolineForward(args)...));
   }
 };
 
-
-template <typename A1>
-struct TrampolineHelper<void(A1)> {
-  static void Run(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void(A1)>& cb, A1 a1) {
-    task_runner->PostTask(FROM_HERE, base::Bind(cb,
-        internal::TrampolineForward(a1)));
-  }
-};
-
-
-template <typename A1, typename A2>
-struct TrampolineHelper<void(A1, A2)> {
-  static void Run(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void(A1, A2)>& cb, A1 a1, A2 a2) {
-    task_runner->PostTask(FROM_HERE, base::Bind(cb,
-        internal::TrampolineForward(a1), internal::TrampolineForward(a2)));
-  }
-};
-
-
-template <typename A1, typename A2, typename A3>
-struct TrampolineHelper<void(A1, A2, A3)> {
-  static void Run(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void(A1, A2, A3)>& cb, A1 a1, A2 a2, A3 a3) {
-    task_runner->PostTask(FROM_HERE, base::Bind(cb,
-        internal::TrampolineForward(a1), internal::TrampolineForward(a2),
-        internal::TrampolineForward(a3)));
-  }
-};
-
-
-template <typename A1, typename A2, typename A3, typename A4>
-struct TrampolineHelper<void(A1, A2, A3, A4)> {
-  static void Run(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void(A1, A2, A3, A4)>& cb, A1 a1, A2 a2, A3 a3,
-          A4 a4) {
-    task_runner->PostTask(FROM_HERE, base::Bind(cb,
-        internal::TrampolineForward(a1), internal::TrampolineForward(a2),
-        internal::TrampolineForward(a3), internal::TrampolineForward(a4)));
-  }
-};
-
-
-template <typename A1, typename A2, typename A3, typename A4, typename A5>
-struct TrampolineHelper<void(A1, A2, A3, A4, A5)> {
-  static void Run(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void(A1, A2, A3, A4, A5)>& cb, A1 a1, A2 a2, A3 a3,
-          A4 a4, A5 a5) {
-    task_runner->PostTask(FROM_HERE, base::Bind(cb,
-        internal::TrampolineForward(a1), internal::TrampolineForward(a2),
-        internal::TrampolineForward(a3), internal::TrampolineForward(a4),
-        internal::TrampolineForward(a5)));
-  }
-};
-
-
-template <typename A1, typename A2, typename A3, typename A4, typename A5,
-    typename A6>
-struct TrampolineHelper<void(A1, A2, A3, A4, A5, A6)> {
-  static void Run(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void(A1, A2, A3, A4, A5, A6)>& cb, A1 a1, A2 a2,
-          A3 a3, A4 a4, A5 a5, A6 a6) {
-    task_runner->PostTask(FROM_HERE, base::Bind(cb,
-        internal::TrampolineForward(a1), internal::TrampolineForward(a2),
-        internal::TrampolineForward(a3), internal::TrampolineForward(a4),
-        internal::TrampolineForward(a5), internal::TrampolineForward(a6)));
-  }
-};
-
-
-template <typename A1, typename A2, typename A3, typename A4, typename A5,
-    typename A6, typename A7>
-struct TrampolineHelper<void(A1, A2, A3, A4, A5, A6, A7)> {
-  static void Run(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void(A1, A2, A3, A4, A5, A6, A7)>& cb, A1 a1, A2 a2,
-          A3 a3, A4 a4, A5 a5, A6 a6, A7 a7) {
-    task_runner->PostTask(FROM_HERE, base::Bind(cb,
-        internal::TrampolineForward(a1), internal::TrampolineForward(a2),
-        internal::TrampolineForward(a3), internal::TrampolineForward(a4),
-        internal::TrampolineForward(a5), internal::TrampolineForward(a6),
-        internal::TrampolineForward(a7)));
-  }
-};
-
-
 }  // namespace internal
 
 template<typename T>
 static base::Callback<T> BindToCurrentLoop(
     const base::Callback<T>& cb) {
   return base::Bind(&internal::TrampolineHelper<T>::Run,
                     base::MessageLoopProxy::current(), cb);
 }
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_