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_MAC_BIND_OBJC_BLOCK_H_ 6#define BASE_MAC_BIND_OBJC_BLOCK_H_ 7 8#include <Block.h> 9 10#include "base/bind.h" 11#include "base/callback_forward.h" 12#include "base/mac/scoped_block.h" 13 14// BindBlock builds a callback from an Objective-C block. Example usages: 15// 16// Closure closure = BindBlock(^{DoSomething();}); 17// Callback<int(void)> callback = BindBlock(^{return 42;}); 18 19namespace base { 20 21namespace internal { 22 23// Helper functions to run the block contained in the parameter. 24template<typename R> 25R RunBlock(base::mac::ScopedBlock<R(^)()> block) { 26 R(^extracted_block)() = block.get(); 27 return extracted_block(); 28} 29 30template<typename R, typename A1> 31R RunBlock(base::mac::ScopedBlock<R(^)(A1)> block, A1 a) { 32 R(^extracted_block)(A1) = block.get(); 33 return extracted_block(a); 34} 35 36} // namespace internal 37 38// Construct a callback with no argument from an objective-C block. 39template<typename R> 40base::Callback<R(void)> BindBlock(R(^block)()) { 41 return base::Bind(&base::internal::RunBlock<R>, 42 base::mac::ScopedBlock<R(^)()>(Block_copy(block))); 43} 44 45// Construct a callback with one argument from an objective-C block. 46template<typename R, typename A1> 47base::Callback<R(A1)> BindBlock(R(^block)(A1)) { 48 return base::Bind(&base::internal::RunBlock<R, A1>, 49 base::mac::ScopedBlock<R(^)(A1)>(Block_copy(block))); 50} 51 52} // namespace base 53 54#endif // BASE_MAC_BIND_OBJC_BLOCK_H_ 55