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73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
// Copyright (c) 2013 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_SCOPED_BLOCK_H_
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#define BASE_MAC_SCOPED_BLOCK_H_
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#include <Block.h>
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#include "base/mac/scoped_typeref.h"
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#if defined(__has_feature) && __has_feature(objc_arc)
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#define BASE_MAC_BRIDGE_CAST(TYPE, VALUE) (__bridge TYPE)(VALUE)
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#else
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#define BASE_MAC_BRIDGE_CAST(TYPE, VALUE) VALUE
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#endif
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namespace base {
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namespace mac {
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namespace internal {
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template <typename B>
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struct ScopedBlockTraits {
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static B InvalidValue() { return nullptr; }
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static B Retain(B block) {
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return BASE_MAC_BRIDGE_CAST(
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B, Block_copy(BASE_MAC_BRIDGE_CAST(const void*, block)));
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}
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static void Release(B block) {
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Block_release(BASE_MAC_BRIDGE_CAST(const void*, block));
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}
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};
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} // namespace internal
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// ScopedBlock<> is patterned after ScopedCFTypeRef<>, but uses Block_copy() and
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// Block_release() instead of CFRetain() and CFRelease().
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template <typename B>
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class ScopedBlock : public ScopedTypeRef<B, internal::ScopedBlockTraits<B>> {
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public:
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using Traits = internal::ScopedBlockTraits<B>;
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#if !defined(__has_feature) || !__has_feature(objc_arc)
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explicit ScopedBlock(
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B block = Traits::InvalidValue(),
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base::scoped_policy::OwnershipPolicy policy = base::scoped_policy::ASSUME)
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: ScopedTypeRef<B, Traits>(block, policy) {}
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#else
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explicit ScopedBlock(B block = Traits::InvalidValue())
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: ScopedTypeRef<B, Traits>(block, base::scoped_policy::RETAIN) {}
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#endif
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#if !defined(__has_feature) || !__has_feature(objc_arc)
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void reset(B block = Traits::InvalidValue(),
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base::scoped_policy::OwnershipPolicy policy =
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base::scoped_policy::ASSUME) {
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ScopedTypeRef<B, Traits>::reset(block, policy);
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}
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#else
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void reset(B block = Traits::InvalidValue()) {
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ScopedTypeRef<B, Traits>::reset(block, base::scoped_policy::RETAIN);
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}
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#endif
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};
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} // namespace mac
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} // namespace base
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#undef BASE_MAC_BRIDGE_CAST
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#endif // BASE_MAC_SCOPED_BLOCK_H_
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