88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*
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* Copyright (C) 2015 Max Kellermann <max.kellermann@gmail.com>
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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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*
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* - 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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*
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* - 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
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* 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
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SCOPE_EXIT_HXX
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#define SCOPE_EXIT_HXX
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#include <utility>
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/**
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* Internal class. Do not use directly.
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*/
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template<typename F>
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class ScopeExitGuard : F {
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bool enabled = true;
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public:
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explicit ScopeExitGuard(F &&f):F(std::forward<F>(f)) {}
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ScopeExitGuard(ScopeExitGuard &&src)
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:F(std::move(src)), enabled(src.enabled) {
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src.enabled = false;
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}
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~ScopeExitGuard() {
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if (enabled)
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F::operator()();
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}
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ScopeExitGuard(const ScopeExitGuard &) = delete;
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ScopeExitGuard &operator=(const ScopeExitGuard &) = delete;
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};
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/**
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* Internal class. Do not use directly.
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*/
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struct ScopeExitTag {
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/* this operator is a trick so we don't need to close
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parantheses at the end of the expression AtScopeExit()
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call */
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template<typename F>
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ScopeExitGuard<F> operator+(F &&f) {
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return ScopeExitGuard<F>(std::forward<F>(f));
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}
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};
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#define ScopeExitCat(a, b) a ## b
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#define ScopeExitName(line) ScopeExitCat(at_scope_exit_, line)
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/**
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* Call the block after this macro at the end of the current scope.
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* Parameters are lambda captures.
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*
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* This is exception-safe, however the given code block must not throw
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* exceptions.
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*
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* This attempts to be a better boost/scope_exit.hpp, without all of
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* Boost's compile-time and runtime bloat.
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*/
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#define AtScopeExit(...) auto ScopeExitName(__LINE__) = ScopeExitTag() + [__VA_ARGS__]()
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#endif
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