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// 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 function to run the block contained in the parameter.
template<typename ReturnType>
ReturnType RunBlock(base::mac::ScopedBlock<ReturnType(^)()> block) {
ReturnType(^extracted_block)() = block.get();
return extracted_block();
}
} // namespace internal
// Construct a callback from an objective-C block.
template<typename ReturnType>
base::Callback<ReturnType(void)> BindBlock(ReturnType(^block)()) {
return base::Bind(&base::internal::RunBlock<ReturnType>,
base::mac::ScopedBlock<ReturnType(^)()>(
Block_copy(block)));
}
} // namespace base
#endif // BASE_MAC_BIND_OBJC_BLOCK_H_
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