mirror of
https://github.com/outbackdingo/UltraGrid.git
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42e5fd03e1
It is rarely used and we don't need to spoil c++ sources using misc.h with <optional> header.
62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
/**
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* @file utils/ref_count.hpp
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* @author Martin Pulec <pulec@cesnet.cz>
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*/
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/*
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* Copyright (c) 2022 CESNET z.s.p.o.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef UTILS_REF_COUNT_H_0FC2C86B_8E95_45EF_AADE_F0A5C4ECBC31
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#define UTILS_REF_COUNT_H_0FC2C86B_8E95_45EF_AADE_F0A5C4ECBC31
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#include <optional>
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template<typename T> struct ref_count_init_once {
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std::optional<T> operator()(T (*init)(void), int &i) {
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if (i++ == 0) {
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return std::optional<T>(init());
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}
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return std::nullopt;
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}
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};
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struct ref_count_terminate_last {
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void operator()(void (*terminate)(void), int &i) {
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if (--i == 0) {
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terminate();
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}
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}
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};
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#endif // defined UTILS_REF_COUNT_H_0FC2C86B_8E95_45EF_AADE_F0A5C4ECBC31
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