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Diffstat (limited to 'base/message_loop_helpers.h')
-rw-r--r-- | base/message_loop_helpers.h | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/base/message_loop_helpers.h b/base/message_loop_helpers.h deleted file mode 100644 index 151128c..0000000 --- a/base/message_loop_helpers.h +++ /dev/null @@ -1,73 +0,0 @@ -// Copyright (c) 2011 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 BASE_MESSAGE_LOOP_HELPERS_H_ -#define BASE_MESSAGE_LOOP_HELPERS_H_ -#pragma once - -#include "base/basictypes.h" - -namespace tracked_objects { -class Location; -} - -namespace base { - -namespace subtle { -template <class T, class R> class DeleteHelperInternal; -} - -// This is a template helper which uses a function indirection to erase T from -// the function signature while still remembering it so we can call the correct -// destructor. We use this trick so we don't need to include bind.h in a -// header file. We also embed the function in a class to make it easier for -// users of DeleteSoon to declare the helper as a friend. -template <class T> -class DeleteHelper { - private: - // TODO(dcheng): Move the return type back to a function template parameter. - template <class T2, class R> friend class subtle::DeleteHelperInternal; - - static void DoDelete(const void* object) { - delete reinterpret_cast<const T*>(object); - } - - DISALLOW_COPY_AND_ASSIGN(DeleteHelper); -}; - -namespace subtle { - -// An internal MessageLoop-like class helper for DeleteHelper. We don't want to -// expose DoDelete directly since the void* argument makes it possible to pass -// an object of the wrong type to delete. Instead, we force callers to go -// through DeleteHelperInternal for type safety. MessageLoop-like classes which -// expose a DeleteSoon method should friend this class and implement a -// DeleteSoonInternal method with the following signature: -// bool(const tracked_objects::Location&, -// void(*deleter)(const void*), -// void* object) -// An implementation of DeleteSoonInternal should simply create a base::Closure -// from (deleter, object) and return the result of posting the task. -template <class T, class ReturnType> -class DeleteHelperInternal { - public: - template <class MessageLoopType> - static ReturnType DeleteOnMessageLoop( - MessageLoopType* message_loop, - const tracked_objects::Location& from_here, - const T* object) { - return message_loop->DeleteSoonInternal(from_here, - &DeleteHelper<T>::DoDelete, - object); - } - - private: - DISALLOW_COPY_AND_ASSIGN(DeleteHelperInternal); -}; - -} // namespace subtle - -} // namespace base - -#endif // BASE_MESSAGE_LOOP_HELPERS_H_ |