media/base/bind_to_current_loop.h

   1 // This file was GENERATED by command:
   2 //     pump.py bind_to_current_loop.h.pump
   3 // DO NOT EDIT BY HAND!!!
   4
   5
   6 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   7 // Use of this source code is governed by a BSD-style license that can be
   8 // found in the LICENSE file.
   9
  10 #ifndef MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_
  11 #define MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_
  12
  13 #include "base/bind.h"
  14 #include "base/location.h"
  15 #include "base/message_loop/message_loop_proxy.h"
  16 #include "base/single_thread_task_runner.h"
  17
  18 // This is a helper utility for base::Bind()ing callbacks to the current
  19 // MessageLoop. The typical use is when |a| (of class |A|) wants to hand a
  20 // callback such as base::Bind(&A::AMethod, a) to |b|, but needs to ensure that
  21 // when |b| executes the callback, it does so on |a|'s current MessageLoop.
  22 //
  23 // Typical usage: request to be called back on the current thread:
  24 // other->StartAsyncProcessAndCallMeBack(
  25 //    media::BindToCurrentLoop(base::Bind(&MyClass::MyMethod, this)));
  26 //
  27 // Note that like base::Bind(), BindToCurrentLoop() can't bind non-constant
  28 // references, and that *unlike* base::Bind(), BindToCurrentLoop() makes copies
  29 // of its arguments, and thus can't be used with arrays.
  30
  31 namespace media {
  32
  33 // Mimic base::internal::CallbackForward, replacing p.Pass() with
  34 // base::Passed(&p) to account for the extra layer of indirection.
  35 namespace internal {
  36 template <typename T>
  37 T& TrampolineForward(T& t) { return t; }
  38
  39 template <typename T, typename R>
  40 base::internal::PassedWrapper<scoped_ptr<T, R> > TrampolineForward(
  41     scoped_ptr<T, R>& p) { return base::Passed(&p); }
  42
  43 template <typename T>
  44 base::internal::PassedWrapper<ScopedVector<T> > TrampolineForward(
  45     ScopedVector<T>& p) { return base::Passed(&p); }
  46
  47 template <typename T> struct TrampolineHelper;
  48
  49 template <>
  50 struct TrampolineHelper<void()> {
  51   static void Run(
  52       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
  53       const base::Callback<void()>& cb) {
  54     task_runner->PostTask(FROM_HERE, base::Bind(cb));
  55   }
  56 };
  57
  58
  59 template <typename A1>
  60 struct TrampolineHelper<void(A1)> {
  61   static void Run(
  62       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
  63       const base::Callback<void(A1)>& cb, A1 a1) {
  64     task_runner->PostTask(FROM_HERE, base::Bind(cb,
  65         internal::TrampolineForward(a1)));
  66   }
  67 };
  68
  69
  70 template <typename A1, typename A2>
  71 struct TrampolineHelper<void(A1, A2)> {
  72   static void Run(
  73       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
  74       const base::Callback<void(A1, A2)>& cb, A1 a1, A2 a2) {
  75     task_runner->PostTask(FROM_HERE, base::Bind(cb,
  76         internal::TrampolineForward(a1), internal::TrampolineForward(a2)));
  77   }
  78 };
  79
  80
  81 template <typename A1, typename A2, typename A3>
  82 struct TrampolineHelper<void(A1, A2, A3)> {
  83   static void Run(
  84       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
  85       const base::Callback<void(A1, A2, A3)>& cb, A1 a1, A2 a2, A3 a3) {
  86     task_runner->PostTask(FROM_HERE, base::Bind(cb,
  87         internal::TrampolineForward(a1), internal::TrampolineForward(a2),
  88         internal::TrampolineForward(a3)));
  89   }
  90 };
  91
  92
  93 template <typename A1, typename A2, typename A3, typename A4>
  94 struct TrampolineHelper<void(A1, A2, A3, A4)> {
  95   static void Run(
  96       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
  97       const base::Callback<void(A1, A2, A3, A4)>& cb, A1 a1, A2 a2, A3 a3,
  98           A4 a4) {
  99     task_runner->PostTask(FROM_HERE, base::Bind(cb,
 100         internal::TrampolineForward(a1), internal::TrampolineForward(a2),
 101         internal::TrampolineForward(a3), internal::TrampolineForward(a4)));
 102   }
 103 };
 104
 105
 106 template <typename A1, typename A2, typename A3, typename A4, typename A5>
 107 struct TrampolineHelper<void(A1, A2, A3, A4, A5)> {
 108   static void Run(
 109       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
 110       const base::Callback<void(A1, A2, A3, A4, A5)>& cb, A1 a1, A2 a2, A3 a3,
 111           A4 a4, A5 a5) {
 112     task_runner->PostTask(FROM_HERE, base::Bind(cb,
 113         internal::TrampolineForward(a1), internal::TrampolineForward(a2),
 114         internal::TrampolineForward(a3), internal::TrampolineForward(a4),
 115         internal::TrampolineForward(a5)));
 116   }
 117 };
 118
 119
 120 template <typename A1, typename A2, typename A3, typename A4, typename A5,
 121     typename A6>
 122 struct TrampolineHelper<void(A1, A2, A3, A4, A5, A6)> {
 123   static void Run(
 124       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
 125       const base::Callback<void(A1, A2, A3, A4, A5, A6)>& cb, A1 a1, A2 a2,
 126           A3 a3, A4 a4, A5 a5, A6 a6) {
 127     task_runner->PostTask(FROM_HERE, base::Bind(cb,
 128         internal::TrampolineForward(a1), internal::TrampolineForward(a2),
 129         internal::TrampolineForward(a3), internal::TrampolineForward(a4),
 130         internal::TrampolineForward(a5), internal::TrampolineForward(a6)));
 131   }
 132 };
 133
 134
 135 template <typename A1, typename A2, typename A3, typename A4, typename A5,
 136     typename A6, typename A7>
 137 struct TrampolineHelper<void(A1, A2, A3, A4, A5, A6, A7)> {
 138   static void Run(
 139       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
 140       const base::Callback<void(A1, A2, A3, A4, A5, A6, A7)>& cb, A1 a1, A2 a2,
 141           A3 a3, A4 a4, A5 a5, A6 a6, A7 a7) {
 142     task_runner->PostTask(FROM_HERE, base::Bind(cb,
 143         internal::TrampolineForward(a1), internal::TrampolineForward(a2),
 144         internal::TrampolineForward(a3), internal::TrampolineForward(a4),
 145         internal::TrampolineForward(a5), internal::TrampolineForward(a6),
 146         internal::TrampolineForward(a7)));
 147   }
 148 };
 149
 150
 151 }  // namespace internal
 152
 153 template<typename T>
 154 static base::Callback<T> BindToCurrentLoop(
 155     const base::Callback<T>& cb) {
 156   return base::Bind(&internal::TrampolineHelper<T>::Run,
 157                     base::MessageLoopProxy::current(), cb);
 158 }
 159
 160 }  // namespace media
 161
 162 #endif  // MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_