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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/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_policy.h"
namespace base {
namespace mac {
// ScopedBlock<> is patterned after ScopedCFTypeRef<>, but uses Block_copy() and
// Block_release() instead of CFRetain() and CFRelease().
template<typename B>
class ScopedBlock {
public:
explicit ScopedBlock(
B block = NULL,
base::scoped_policy::OwnershipPolicy policy = base::scoped_policy::ASSUME)
: block_(block) {
if (block_ && policy == base::scoped_policy::RETAIN)
block_ = Block_copy(block);
}
ScopedBlock(const ScopedBlock<B>& that)
: block_(that.block_) {
if (block_)
block_ = Block_copy(block_);
}
~ScopedBlock() {
if (block_)
Block_release(block_);
}
ScopedBlock& operator=(const ScopedBlock<B>& that) {
reset(that.get(), base::scoped_policy::RETAIN);
return *this;
}
void reset(B block = NULL,
base::scoped_policy::OwnershipPolicy policy =
base::scoped_policy::ASSUME) {
if (block && policy == base::scoped_policy::RETAIN)
block = Block_copy(block);
if (block_)
Block_release(block_);
block_ = block;
}
bool operator==(B that) const {
return block_ == that;
}
bool operator!=(B that) const {
return block_ != that;
}
operator B() const {
return block_;
}
B get() const {
return block_;
}
void swap(ScopedBlock& that) {
B temp = that.block_;
that.block_ = block_;
block_ = temp;
}
B release() WARN_UNUSED_RESULT {
B temp = block_;
block_ = NULL;
return temp;
}
private:
B block_;
};
} // namespace mac
} // namespace base
#endif // BASE_MAC_SCOPED_BLOCK_H_
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