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68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/*
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* RaiiHelpers.h
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*
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* Copyright (c) 2022 Dominic Clark <mrdomclark/at/gmail.com>
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program 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 GNU
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* 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
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef LMMS_RAII_HELPERS_H
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#define LMMS_RAII_HELPERS_H
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#include <cstddef>
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#include <memory>
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namespace lmms
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{
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template<typename T, T Null>
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class NullableResource
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{
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public:
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NullableResource() = default;
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NullableResource(std::nullptr_t) noexcept { }
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NullableResource(T value) noexcept : m_value{value} { }
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operator T() const noexcept { return m_value; }
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explicit operator bool() const noexcept { return m_value != Null; }
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friend bool operator==(NullableResource a, NullableResource b) noexcept { return a.m_value == b.m_value; }
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friend bool operator==(NullableResource a, T b) noexcept { return a.m_value == b; }
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friend bool operator==(T a, NullableResource b) noexcept { return a == b.m_value; }
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friend bool operator!=(NullableResource a, NullableResource b) noexcept { return a.m_value != b.m_value; }
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friend bool operator!=(NullableResource a, T b) noexcept { return a.m_value != b; }
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friend bool operator!=(T a, NullableResource b) noexcept { return a != b.m_value; }
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private:
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T m_value = Null;
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};
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template<typename T, T Null, auto Deleter>
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struct NullableResourceDeleter
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{
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using pointer = NullableResource<T, Null>;
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void operator()(T value) const noexcept { Deleter(value); }
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};
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template<typename T, T Null, auto Deleter>
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using UniqueNullableResource = std::unique_ptr<T, NullableResourceDeleter<T, Null, Deleter>>;
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} // namespace lmms
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#endif // LMMS_RAII_HELPERS_H
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