scope_guard.h

Go to the documentation of this file.

/*
 * This file is part of liblcf. Copyright (c) 2020 liblcf authors.
 * https://github.com/EasyRPG/liblcf - https://easyrpg.org
 *
 * liblcf is Free/Libre Open Source Software, released under the MIT License.
 * For the full copyright and license information, please view the COPYING
 * file that was distributed with this source code.
 */
 
#ifndef LCF_SCOPE_GUARD_H
#define LCF_SCOPE_GUARD_H
#include <utility>
 
template <typename F>
class ScopeGuard {
    public:
        ScopeGuard() = default;
        explicit ScopeGuard(const F& f) : _f(f), _active(true) {}
        explicit ScopeGuard(F&& f) : _f(std::move(f)), _active(true) {}
 
        ScopeGuard(const ScopeGuard&) = delete;
        ScopeGuard& operator=(const ScopeGuard&) = delete;
 
        ScopeGuard(ScopeGuard&& o)
            : _f(std::move(o._f)), _active(true) { o._active = false; }
        ScopeGuard& operator=(ScopeGuard&&) = delete;
 
        ~ScopeGuard() { Fire(); }
 
        void Fire() noexcept;
        void Dismiss() noexcept;
        bool IsActive() noexcept;
    private:
        F _f;
        bool _active = false;
};
 
template <typename F>
inline ScopeGuard<F> makeScopeGuard(F&& f) {
    return ScopeGuard<F>(std::forward<F>(f));
}
 
template <typename F>
inline void ScopeGuard<F>::Fire() noexcept {
    if (_active) {
        _f();
        Dismiss();
    }
}
 
template <typename F>
inline void ScopeGuard<F>::Dismiss() noexcept {
    _active = false;
}
 
template <typename F>
inline bool ScopeGuard<F>::IsActive() noexcept {
    return _active;
}
 
#endif