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Atmosphere/libraries/libvapours/include/vapours/util/util_scope_guard.hpp

60 lines
2 KiB
C++

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Scope guard logic lovingly taken from Andrei Alexandrescu's "Systemic Error Handling in C++" */
#pragma once
#include <vapours/common.hpp>
#include <vapours/assert.hpp>
namespace ams::util {
namespace impl {
template<class F>
class ScopeGuard {
NON_COPYABLE(ScopeGuard);
private:
F f;
bool active;
public:
constexpr ALWAYS_INLINE ScopeGuard(F f) : f(std::move(f)), active(true) { }
constexpr ALWAYS_INLINE ~ScopeGuard() { if (active) { f(); } }
constexpr ALWAYS_INLINE void Cancel() { active = false; }
constexpr ALWAYS_INLINE ScopeGuard(ScopeGuard&& rhs) : f(std::move(rhs.f)), active(rhs.active) {
rhs.Cancel();
}
ScopeGuard &operator=(ScopeGuard&& rhs) = delete;
};
template<class F>
constexpr ALWAYS_INLINE ScopeGuard<F> MakeScopeGuard(F f) {
return ScopeGuard<F>(std::move(f));
}
enum class ScopeGuardOnExit {};
template <typename F>
constexpr ALWAYS_INLINE ScopeGuard<F> operator+(ScopeGuardOnExit, F&& f) {
return ScopeGuard<F>(std::forward<F>(f));
}
}
}
#define SCOPE_GUARD ::ams::util::impl::ScopeGuardOnExit() + [&]() ALWAYS_INLINE_LAMBDA
#define ON_SCOPE_EXIT auto ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE_) = SCOPE_GUARD