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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef BlockPtr_h
#define BlockPtr_h
#include <Block.h>
#include <wtf/Assertions.h>
namespace WTF {
template<typename> class BlockPtr;
template<typename R, typename... Args>
class BlockPtr<R (Args...)> {
public:
BlockPtr()
: m_block(nullptr)
{
}
BlockPtr(R (^block)(Args...))
: m_block(Block_copy(block))
{
}
BlockPtr(const BlockPtr& other)
: m_block(Block_copy(other.m_block))
{
}
BlockPtr(BlockPtr&& other)
: m_block(std::exchange(other.m_block, nullptr))
{
}
~BlockPtr()
{
Block_release(m_block);
}
BlockPtr& operator=(const BlockPtr& other)
{
if (this != &other) {
Block_release(m_block);
m_block = Block_copy(other.m_block);
}
return *this;
}
BlockPtr& operator=(BlockPtr&& other)
{
ASSERT(this != &other);
Block_release(m_block);
m_block = std::exchange(other.m_block, nullptr);
return *this;
}
explicit operator bool() const { return m_block; }
bool operator!() const { return !m_block; }
R operator()(Args... arguments) const
{
ASSERT(m_block);
return m_block(std::forward<Args>(arguments)...);
}
private:
R (^m_block)(Args...);
};
template<typename R, typename... Args>
inline BlockPtr<R (Args...)> makeBlockPtr(R (^block)(Args...))
{
return BlockPtr<R (Args...)>(block);
}
}
using WTF::BlockPtr;
using WTF::makeBlockPtr;
#endif // BlockPtr_h
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