/*
    barrier -- mouse and keyboard sharing utility
    Copyright (C) Barrier contributors

    This package is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    found in the file LICENSE that should have accompanied this file.

    This package is distributed in the hope that 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/>.
*/

#ifndef BARRIER_LIB_BASE_FINALLY_H
#define BARRIER_LIB_BASE_FINALLY_H

#include <utility>

namespace barrier {

// this implements a common pattern of executing an action at the end of function

template<class Callable>
class final_action {
public:
    final_action() noexcept {}
    final_action(Callable callable) noexcept : callable_{callable} {}

    ~final_action() noexcept
    {
        if (!invoked_) {
            callable_();
        }
    }

    final_action(final_action&& other) noexcept :
        callable_{std::move(other.callable_)}
    {
        std::swap(invoked_, other.invoked_);
    }

    final_action(const final_action&) = delete;
    final_action& operator=(const final_action&) = delete;
private:
    bool invoked_ = false;
    Callable callable_;
};

template<class Callable>
inline final_action<Callable> finally(Callable&& callable) noexcept
{
    return final_action<Callable>(std::forward<Callable>(callable));
}

} // namespace barrier

#endif // BARRIER_LIB_BASE_FINALLY_H