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