55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MAC_BIND_OBJC_BLOCK_H_
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#define BASE_MAC_BIND_OBJC_BLOCK_H_
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#include <Block.h>
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#include "base/bind.h"
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#include "base/callback_forward.h"
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#include "base/mac/scoped_block.h"
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// BindBlock builds a callback from an Objective-C block. Example usages:
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//
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// Closure closure = BindBlock(^{DoSomething();});
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// Callback<int(void)> callback = BindBlock(^{return 42;});
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namespace base {
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namespace internal {
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// Helper functions to run the block contained in the parameter.
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template<typename R>
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R RunBlock(base::mac::ScopedBlock<R(^)()> block) {
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R(^extracted_block)() = block.get();
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return extracted_block();
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}
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template<typename R, typename A1>
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R RunBlock(base::mac::ScopedBlock<R(^)(A1)> block, A1 a) {
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R(^extracted_block)(A1) = block.get();
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return extracted_block(a);
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}
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} // namespace internal
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// Construct a callback with no argument from an objective-C block.
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template<typename R>
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base::Callback<R(void)> BindBlock(R(^block)()) {
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return base::Bind(&base::internal::RunBlock<R>,
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base::mac::ScopedBlock<R(^)()>(Block_copy(block)));
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}
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// Construct a callback with one argument from an objective-C block.
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template<typename R, typename A1>
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base::Callback<R(A1)> BindBlock(R(^block)(A1)) {
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return base::Bind(&base::internal::RunBlock<R, A1>,
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base::mac::ScopedBlock<R(^)(A1)>(Block_copy(block)));
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}
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} // namespace base
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#endif // BASE_MAC_BIND_OBJC_BLOCK_H_
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