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/* |
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* Scope Guard |
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* Copyright (C) 2017 offa |
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* |
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* This file is part of Scope Guard. |
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* |
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* Scope Guard is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* Scope Guard is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with Scope Guard. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <functional> |
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namespace sr |
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{ |
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namespace detail |
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{ |
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template<class T> |
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struct Wrapper |
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{ |
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template<class TT, class G, std::enable_if_t<std::is_constructible<T, TT>::value, int> = 0> |
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explicit Wrapper(TT&& value, G&& g) noexcept(noexcept(Wrapper{value})) : Wrapper(value) |
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{ |
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g.release(); |
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} |
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T& get() noexcept |
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{ |
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return m_value; |
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} |
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const T& get() const noexcept |
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{ |
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return m_value; |
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} |
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void reset(T&& newValue) noexcept(std::is_nothrow_assignable<T, decltype(std::move_if_noexcept(newValue))>::value) |
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{ |
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m_value = std::move_if_noexcept(newValue); |
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} |
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void reset(const T& newValue) noexcept(std::is_nothrow_assignable<T, const T&>::value) |
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{ |
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m_value = newValue; |
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} |
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private: |
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Wrapper(const T& value) noexcept(noexcept(T{value})) : m_value(value) |
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{ |
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} |
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Wrapper(T&& value) noexcept(noexcept(T{std::move_if_noexcept(value)})) : m_value(std::move_if_noexcept(value)) |
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{ |
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} |
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T m_value; |
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}; |
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template<class T> |
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struct Wrapper<T&> |
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{ |
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template<class TT, class G, std::enable_if_t<std::is_convertible<TT, T&>::value, int> = 0> |
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explicit Wrapper(TT&& value, G&& g) noexcept(noexcept(static_cast<T&>(value))) : m_value(static_cast<T&>(value)) |
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{ |
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g.release(); |
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} |
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T& get() noexcept |
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{ |
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return m_value.get(); |
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} |
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const T& get() const noexcept |
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{ |
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return m_value.get(); |
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} |
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void reset(T& newValue) noexcept |
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{ |
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m_value = std::ref(newValue); |
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} |
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private: |
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std::reference_wrapper<T> m_value; |
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}; |
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} |
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} |