| // Copyright (c) 2012 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_MAC_BIND_OBJC_BLOCK_H_ |
| #define BASE_MAC_BIND_OBJC_BLOCK_H_ |
| |
| #include <Block.h> |
| |
| #include "base/bind.h" |
| #include "base/callback_forward.h" |
| #include "base/mac/scoped_block.h" |
| |
| // BindBlock builds a callback from an Objective-C block. Example usages: |
| // |
| // Closure closure = BindBlock(^{DoSomething();}); |
| // Callback<int(void)> callback = BindBlock(^{return 42;}); |
| |
| namespace base { |
| |
| namespace internal { |
| |
| // Helper functions to run the block contained in the parameter. |
| template<typename R> |
| R RunBlock(base::mac::ScopedBlock<R(^)()> block) { |
| R(^extracted_block)() = block.get(); |
| return extracted_block(); |
| } |
| |
| template<typename R, typename A1> |
| R RunBlock(base::mac::ScopedBlock<R(^)(A1)> block, A1 a) { |
| R(^extracted_block)(A1) = block.get(); |
| return extracted_block(a); |
| } |
| |
| } // namespace internal |
| |
| // Construct a callback with no argument from an objective-C block. |
| template<typename R> |
| base::Callback<R(void)> BindBlock(R(^block)()) { |
| return base::Bind(&base::internal::RunBlock<R>, |
| base::mac::ScopedBlock<R(^)()>(Block_copy(block))); |
| } |
| |
| // Construct a callback with one argument from an objective-C block. |
| template<typename R, typename A1> |
| base::Callback<R(A1)> BindBlock(R(^block)(A1)) { |
| return base::Bind(&base::internal::RunBlock<R, A1>, |
| base::mac::ScopedBlock<R(^)(A1)>(Block_copy(block))); |
| } |
| |
| } // namespace base |
| |
| #endif // BASE_MAC_BIND_OBJC_BLOCK_H_ |