82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <type_traits>
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#include <wtf/StdLibExtras.h>
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// Based on http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0052r2.pdf
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namespace WTF {
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template<typename ExitFunction>
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class ScopeExit final {
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public:
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template<typename ExitFunctionParameter>
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explicit ScopeExit(ExitFunctionParameter&& exitFunction)
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: m_exitFunction(std::forward<ExitFunctionParameter>(exitFunction))
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{
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}
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ScopeExit(ScopeExit&& other)
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: m_exitFunction(WTFMove(other.m_exitFunction))
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, m_executeOnDestruction(std::exchange(other.m_executeOnDestruction, false))
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{
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}
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~ScopeExit()
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{
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if (m_executeOnDestruction)
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m_exitFunction();
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}
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void release()
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{
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m_executeOnDestruction = false;
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}
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ScopeExit(const ScopeExit&) = delete;
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ScopeExit& operator=(const ScopeExit&) = delete;
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ScopeExit& operator=(ScopeExit&&) = delete;
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private:
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ExitFunction m_exitFunction;
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bool m_executeOnDestruction { true };
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};
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template<typename ExitFunction> ScopeExit<ExitFunction> makeScopeExit(ExitFunction&&) WARN_UNUSED_RETURN;
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template<typename ExitFunction>
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ScopeExit<ExitFunction> makeScopeExit(ExitFunction&& exitFunction)
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{
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return ScopeExit<ExitFunction>(std::forward<ExitFunction>(exitFunction));
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}
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}
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using WTF::ScopeExit;
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using WTF::makeScopeExit;
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