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60 lines
2 KiB
C++
60 lines
2 KiB
C++
/*
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* Copyright (c) 2018-2020 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 <vapours/common.hpp>
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#include <vapours/assert.hpp>
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namespace ams::util {
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namespace impl {
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template<class F>
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class ScopeGuard {
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NON_COPYABLE(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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constexpr ALWAYS_INLINE ScopeGuard(F f) : f(std::move(f)), active(true) { }
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constexpr ALWAYS_INLINE ~ScopeGuard() { if (active) { f(); } }
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constexpr ALWAYS_INLINE void Cancel() { active = false; }
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constexpr ALWAYS_INLINE 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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ScopeGuard &operator=(ScopeGuard&& rhs) = delete;
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};
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template<class F>
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constexpr ALWAYS_INLINE 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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constexpr ALWAYS_INLINE 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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}
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}
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#define SCOPE_GUARD ::ams::util::impl::ScopeGuardOnExit() + [&]() ALWAYS_INLINE_LAMBDA
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#define ON_SCOPE_EXIT auto ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE_) = SCOPE_GUARD
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