15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$$ This is a pump file for generating file templates. Pump is a python 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$$ script that is part of the Google Test suite of utilities. Description 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$$ can be found here: 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$$ 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$$ http://code.google.com/p/googletest/wiki/PumpManual 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$$ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$$ See comment for MAX_ARITY in base/bind.h.pump. 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$var MAX_ARITY = 7 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#ifndef MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_ 165d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#define MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_ 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/bind.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/location.h" 20868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/message_loop/message_loop_proxy.h" 215d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "base/single_thread_task_runner.h" 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// This is a helper utility for base::Bind()ing callbacks to the current 245d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// MessageLoop. The typical use is when |a| (of class |A|) wants to hand a 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// callback such as base::Bind(&A::AMethod, a) to |b|, but needs to ensure that 265d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// when |b| executes the callback, it does so on |a|'s current MessageLoop. 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Typical usage: request to be called back on the current thread: 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// other->StartAsyncProcessAndCallMeBack( 305d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// media::BindToCurrentLoop(base::Bind(&MyClass::MyMethod, this))); 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 325d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// Note that like base::Bind(), BindToCurrentLoop() can't bind non-constant 335d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// references, and that *unlike* base::Bind(), BindToCurrentLoop() makes copies 345d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// of its arguments, and thus can't be used with arrays. 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Mimic base::internal::CallbackForward, replacing p.Pass() with 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// base::Passed(&p) to account for the extra layer of indirection. 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace internal { 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template <typename T> 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)T& TrampolineForward(T& t) { return t; } 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template <typename T, typename R> 45a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)base::internal::PassedWrapper<scoped_ptr<T, R> > TrampolineForward( 46a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) scoped_ptr<T, R>& p) { return base::Passed(&p); } 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template <typename T> 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)base::internal::PassedWrapper<ScopedVector<T> > TrampolineForward( 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScopedVector<T>& p) { return base::Passed(&p); } 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template <typename T> struct TrampolineHelper; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$range ARITY 0..MAX_ARITY 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$for ARITY [[ 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$range ARG 1..ARITY 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template <$for ARG , [[typename A$(ARG)]]> 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct TrampolineHelper<void($for ARG , [[A$(ARG)]])> { 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static void Run( 615d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const scoped_refptr<base::SingleThreadTaskRunner>& task_runner, 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const base::Callback<void($for ARG , [[A$(ARG)]])>& cb 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$if ARITY != 0 [[, ]] 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$for ARG , [[A$(ARG) a$(ARG)]] 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)) { 665d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) task_runner->PostTask(FROM_HERE, base::Bind(cb 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$if ARITY != 0 [[, ]] 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)$for ARG , [[internal::TrampolineForward(a$(ARG))]])); 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)]] $$ for ARITY 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace internal 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template<typename T> 782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static base::Callback<T> BindToCurrentLoop( 792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const base::Callback<T>& cb) { 805d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return base::Bind(&internal::TrampolineHelper<T>::Run, 815d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) base::MessageLoopProxy::current(), cb); 822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 865d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#endif // MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_ 87