media/base/bind_to_loop.h

   1 // This file was GENERATED by command:
   2 //     pump.py bind_to_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_LOOP_H_
  11 #define MEDIA_BASE_BIND_TO_LOOP_H_
  12
  13 #include "base/bind.h"
  14 #include "base/location.h"
  15 #include "base/message_loop/message_loop_proxy.h"
  16
  17 // This is a helper utility for base::Bind()ing callbacks on to particular
  18 // MessageLoops.  A typical use is when |a| (of class |A|) wants to hand a
  19 // callback such as base::Bind(&A::AMethod, a) to |b|, but needs to ensure that
  20 // when |b| executes the callback, it does so on a particular MessageLoop.
  21 //
  22 // Typical usage: request to be called back on the current thread:
  23 // other->StartAsyncProcessAndCallMeBack(
  24 //    media::BindToLoop(MessageLoopProxy::current(),
  25 //                      base::Bind(&MyClass::MyMethod, this)));
  26 //
  27 // Note that like base::Bind(), BindToLoop() can't bind non-constant references,
  28 // and that *unlike* base::Bind(), BindToLoop() makes copies of its arguments,
  29 // 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>
  40 base::internal::PassedWrapper<scoped_ptr<T> > TrampolineForward(
  41     scoped_ptr<T>& p) { return base::Passed(&p); }
  42
  43 template <typename T, typename R>
  44 base::internal::PassedWrapper<scoped_ptr_malloc<T, R> > TrampolineForward(
  45     scoped_ptr_malloc<T, R>& p) { return base::Passed(&p); }
  46
  47 template <typename T>
  48 base::internal::PassedWrapper<ScopedVector<T> > TrampolineForward(
  49     ScopedVector<T>& p) { return base::Passed(&p); }
  50
  51 template <typename T> struct TrampolineHelper;
  52
  53 template <>
  54 struct TrampolineHelper<void()> {
  55   static void Run(
  56       const scoped_refptr<base::MessageLoopProxy>& loop,
  57       const base::Callback<void()>& cb) {
  58     loop->PostTask(FROM_HERE, base::Bind(cb));
  59   }
  60 };
  61
  62
  63 template <typename A1>
  64 struct TrampolineHelper<void(A1)> {
  65   static void Run(
  66       const scoped_refptr<base::MessageLoopProxy>& loop,
  67       const base::Callback<void(A1)>& cb, A1 a1) {
  68     loop->PostTask(FROM_HERE, base::Bind(cb, internal::TrampolineForward(a1)));
  69   }
  70 };
  71
  72
  73 template <typename A1, typename A2>
  74 struct TrampolineHelper<void(A1, A2)> {
  75   static void Run(
  76       const scoped_refptr<base::MessageLoopProxy>& loop,
  77       const base::Callback<void(A1, A2)>& cb, A1 a1, A2 a2) {
  78     loop->PostTask(FROM_HERE, base::Bind(cb, internal::TrampolineForward(a1),
  79         internal::TrampolineForward(a2)));
  80   }
  81 };
  82
  83
  84 template <typename A1, typename A2, typename A3>
  85 struct TrampolineHelper<void(A1, A2, A3)> {
  86   static void Run(
  87       const scoped_refptr<base::MessageLoopProxy>& loop,
  88       const base::Callback<void(A1, A2, A3)>& cb, A1 a1, A2 a2, A3 a3) {
  89     loop->PostTask(FROM_HERE, base::Bind(cb, internal::TrampolineForward(a1),
  90         internal::TrampolineForward(a2), internal::TrampolineForward(a3)));
  91   }
  92 };
  93
  94
  95 template <typename A1, typename A2, typename A3, typename A4>
  96 struct TrampolineHelper<void(A1, A2, A3, A4)> {
  97   static void Run(
  98       const scoped_refptr<base::MessageLoopProxy>& loop,
  99       const base::Callback<void(A1, A2, A3, A4)>& cb, A1 a1, A2 a2, A3 a3,
 100           A4 a4) {
 101     loop->PostTask(FROM_HERE, base::Bind(cb, internal::TrampolineForward(a1),
 102         internal::TrampolineForward(a2), internal::TrampolineForward(a3),
 103         internal::TrampolineForward(a4)));
 104   }
 105 };
 106
 107
 108 template <typename A1, typename A2, typename A3, typename A4, typename A5>
 109 struct TrampolineHelper<void(A1, A2, A3, A4, A5)> {
 110   static void Run(
 111       const scoped_refptr<base::MessageLoopProxy>& loop,
 112       const base::Callback<void(A1, A2, A3, A4, A5)>& cb, A1 a1, A2 a2, A3 a3,
 113           A4 a4, A5 a5) {
 114     loop->PostTask(FROM_HERE, base::Bind(cb, internal::TrampolineForward(a1),
 115         internal::TrampolineForward(a2), internal::TrampolineForward(a3),
 116         internal::TrampolineForward(a4), internal::TrampolineForward(a5)));
 117   }
 118 };
 119
 120
 121 template <typename A1, typename A2, typename A3, typename A4, typename A5,
 122     typename A6>
 123 struct TrampolineHelper<void(A1, A2, A3, A4, A5, A6)> {
 124   static void Run(
 125       const scoped_refptr<base::MessageLoopProxy>& loop,
 126       const base::Callback<void(A1, A2, A3, A4, A5, A6)>& cb, A1 a1, A2 a2,
 127           A3 a3, A4 a4, A5 a5, A6 a6) {
 128     loop->PostTask(FROM_HERE, base::Bind(cb, internal::TrampolineForward(a1),
 129         internal::TrampolineForward(a2), internal::TrampolineForward(a3),
 130         internal::TrampolineForward(a4), internal::TrampolineForward(a5),
 131         internal::TrampolineForward(a6)));
 132   }
 133 };
 134
 135
 136 template <typename A1, typename A2, typename A3, typename A4, typename A5,
 137     typename A6, typename A7>
 138 struct TrampolineHelper<void(A1, A2, A3, A4, A5, A6, A7)> {
 139   static void Run(
 140       const scoped_refptr<base::MessageLoopProxy>& loop,
 141       const base::Callback<void(A1, A2, A3, A4, A5, A6, A7)>& cb, A1 a1, A2 a2,
 142           A3 a3, A4 a4, A5 a5, A6 a6, A7 a7) {
 143     loop->PostTask(FROM_HERE, base::Bind(cb, internal::TrampolineForward(a1),
 144         internal::TrampolineForward(a2), internal::TrampolineForward(a3),
 145         internal::TrampolineForward(a4), internal::TrampolineForward(a5),
 146         internal::TrampolineForward(a6), internal::TrampolineForward(a7)));
 147   }
 148 };
 149
 150
 151 }  // namespace internal
 152
 153 template<typename T>
 154 static base::Callback<T> BindToLoop(
 155     const scoped_refptr<base::MessageLoopProxy>& loop,
 156     const base::Callback<T>& cb) {
 157   return base::Bind(&internal::TrampolineHelper<T>::Run, loop, cb);
 158 }
 159
 160 template<typename T>
 161 static base::Callback<T> BindToCurrentLoop(
 162     const base::Callback<T>& cb) {
 163   return BindToLoop(base::MessageLoopProxy::current(), cb);
 164 }
 165
 166 }  // namespace media
 167
 168 #endif  // MEDIA_BASE_BIND_TO_LOOP_H_