Atmosphere/libraries/libvapours/include/vapours/util/util_scope_guard.hpp
Michael Scire 0105455086 git subrepo clone https://github.com/Atmosphere-NX/Atmosphere-libs libraries
subrepo:
  subdir:   "libraries"
  merged:   "07af583b"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "07af583b"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"
2019-12-09 18:54:29 -08:00

59 lines
1.8 KiB
C++

/*
* Copyright (c) 2018-2019 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 "../defines.hpp"
namespace ams::util {
namespace impl {
template<class F>
class ScopeGuard {
NON_COPYABLE(ScopeGuard);
private:
F f;
bool active;
public:
constexpr ScopeGuard(F f) : f(std::move(f)), active(true) { }
~ScopeGuard() { if (active) { f(); } }
void Cancel() { active = false; }
ScopeGuard(ScopeGuard&& rhs) : f(std::move(rhs.f)), active(rhs.active) {
rhs.Cancel();
}
};
template<class F>
constexpr ScopeGuard<F> MakeScopeGuard(F f) {
return ScopeGuard<F>(std::move(f));
}
enum class ScopeGuardOnExit {};
template <typename F>
constexpr ScopeGuard<F> operator+(ScopeGuardOnExit, F&& f) {
return ScopeGuard<F>(std::forward<F>(f));
}
}
}
#define SCOPE_GUARD ::ams::util::impl::ScopeGuardOnExit() + [&]()
#define ON_SCOPE_EXIT auto ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE_) = SCOPE_GUARD