// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- // vi: set et ts=4 sw=4 sts=4: /* This file is part of the Open Porous Media project (OPM). OPM is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version. OPM 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 OPM. If not, see . Consult the COPYING file in the top-level source directory of this module for the precise wording of the license and the list of copyright holders. */ /*! * \file * * \copydoc Opm::GenericGuard */ #ifndef EWOMS_GENERIC_GUARD_HH #define EWOMS_GENERIC_GUARD_HH namespace Opm { /*! * \ingroup Common * * \brief A simple class which makes sure that a cleanup function is called once the * object is destroyed. * * This class is particularly useful in conjunction with lambdas for code that might * throw exceptions. */ template class GenericGuard { public: GenericGuard(Callback& callback) : callback_(callback) , isEnabled_(true) { } // allow moves GenericGuard(GenericGuard&& other) : callback_(other.callback_) , isEnabled_(other.isEnabled_) { other.isEnabled_ = false; } // disable copies GenericGuard(const GenericGuard& other) = delete; ~GenericGuard() { if (isEnabled_) callback_(); } /*! * \brief Specify whether the guard object is "on duty" or not. * * If the guard object is destroyed while it is "off-duty", the cleanup callback is * not called. At construction, guards are on duty. */ void setEnabled(bool value) { isEnabled_ = value; } /*! * \brief Returns whether the guard object is "on duty" or not. */ bool enabled() const { return isEnabled_; } private: Callback& callback_; bool isEnabled_; }; template GenericGuard make_guard(Callback& callback) { return GenericGuard(callback); } } // namespace Opm #endif