mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
/*
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* Copyright (c) 2018 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Scope guard logic lovingly taken from Andrei Alexandrescu's "Systemic Error Handling in C++" */
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#pragma once
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#include <utility>
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template<class F>
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class ScopeGuard {
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private:
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F f;
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bool active;
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public:
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ScopeGuard(F f) : f(std::move(f)), active(true) { }
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~ScopeGuard() { if (active) { f(); } }
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void Cancel() { active = false; }
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ScopeGuard() = delete;
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ScopeGuard(const ScopeGuard &) = delete;
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ScopeGuard& operator=(const ScopeGuard&) = delete;
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ScopeGuard(ScopeGuard&& rhs) : f(std::move(rhs.f)), active(rhs.active) {
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rhs.Cancel();
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}
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};
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template<class F>
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ScopeGuard<F> MakeScopeGuard(F f) {
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return ScopeGuard<F>(std::move(f));
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}
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enum class ScopeGuardOnExit {};
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template <typename F>
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ScopeGuard<F> operator+(ScopeGuardOnExit, F&& f) {
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return ScopeGuard<F>(std::forward<F>(f));
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}
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#define CONCATENATE_IMPL(S1, s2) s1##s2
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#define CONCATENATE(s1, s2) CONCATENATE_IMPL(s1, s2)
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#ifdef __COUNTER__
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#define ANONYMOUS_VARIABLE(pref) CONCATENATE(pref, __COUNTER__)
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#else
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#define ANONYMOUS_VARIABLE(pref) CONCATENATE(pref, __LINE__)
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#endif
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#define ON_SCOPE_EXIT auto ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE_) = ScopeGuardOnExit() + [&]() |