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 19 namespace base { 20 21 namespace internal { 22 23 // Helper functions to run the block contained in the parameter. 24 template<typename R> 25 R RunBlock(base::mac::ScopedBlock<R(^)()> block) { 26 R(^extracted_block)() = block.get(); 27 return extracted_block(); 28 } 29 30 template<typename R, typename A1> 31 R 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. 39 template<typename R> 40 base::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. 46 template<typename R, typename A1> 47 base::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
