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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.
*/
#pragma once
#include <type_traits>
#include <wtf/StdLibExtras.h>
// Based on http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0052r2.pdf
namespace WTF {
template<typename ExitFunction>
class ScopeExit final {
public:
template<typename ExitFunctionParameter>
explicit ScopeExit(ExitFunctionParameter&& exitFunction)
: m_exitFunction(std::forward<ExitFunctionParameter>(exitFunction))
{
}
ScopeExit(ScopeExit&& other)
: m_exitFunction(WTFMove(other.m_exitFunction))
, m_executeOnDestruction(std::exchange(other.m_executeOnDestruction, false))
{
}
~ScopeExit()
{
if (m_executeOnDestruction)
m_exitFunction();
}
void release()
{
m_executeOnDestruction = false;
}
ScopeExit(const ScopeExit&) = delete;
ScopeExit& operator=(const ScopeExit&) = delete;
ScopeExit& operator=(ScopeExit&&) = delete;
private:
ExitFunction m_exitFunction;
bool m_executeOnDestruction { true };
};
template<typename ExitFunction> ScopeExit<ExitFunction> makeScopeExit(ExitFunction&&) WARN_UNUSED_RETURN;
template<typename ExitFunction>
ScopeExit<ExitFunction> makeScopeExit(ExitFunction&& exitFunction)
{
return ScopeExit<ExitFunction>(std::forward<ExitFunction>(exitFunction));
}
}
using WTF::ScopeExit;
using WTF::makeScopeExit;
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