1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_TASK_RUNNER_UTIL_H_ 6 #define BASE_TASK_RUNNER_UTIL_H_ 7 8 #include <utility> 9 10 #include "base/bind.h" 11 #include "base/bind_helpers.h" 12 #include "base/callback.h" 13 #include "base/logging.h" 14 #include "base/post_task_and_reply_with_result_internal.h" 15 #include "base/task_runner.h" 16 17 namespace base { 18 19 // When you have these methods 20 // 21 // R DoWorkAndReturn(); 22 // void Callback(const R& result); 23 // 24 // and want to call them in a PostTaskAndReply kind of fashion where the 25 // result of DoWorkAndReturn is passed to the Callback, you can use 26 // PostTaskAndReplyWithResult as in this example: 27 // 28 // PostTaskAndReplyWithResult( 29 // target_thread_.task_runner(), 30 // FROM_HERE, 31 // Bind(&DoWorkAndReturn), 32 // Bind(&Callback)); 33 template <typename TaskReturnType, typename ReplyArgType> 34 bool PostTaskAndReplyWithResult(TaskRunner* task_runner, 35 const tracked_objects::Location& from_here, 36 Callback<TaskReturnType()> task, 37 Callback<void(ReplyArgType)> reply) { 38 DCHECK(task); 39 DCHECK(reply); 40 TaskReturnType* result = new TaskReturnType(); 41 return task_runner->PostTaskAndReply( 42 from_here, base::Bind(&internal::ReturnAsParamAdapter<TaskReturnType>, 43 std::move(task), result), 44 base::Bind(&internal::ReplyAdapter<TaskReturnType, ReplyArgType>, 45 std::move(reply), base::Owned(result))); 46 } 47 48 } // namespace base 49 50 #endif // BASE_TASK_RUNNER_UTIL_H_ 51
