90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
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/*
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Copyright (c) 2017, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* 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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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_FLAGS_HPP_INCLUDED
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#define TORRENT_FLAGS_HPP_INCLUDED
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// this is based on Anthony William's article:
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// https://www.justsoftwaresolutions.co.uk/cplusplus/using-enum-classes-as-bitfields.html
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#include <type_traits> // for enable_if
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namespace libtorrent {
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namespace flags {
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template <typename E>
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struct enable_flag_operators : std::false_type {};
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#define ENUM_OPERATOR(op) \
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template<typename E> \
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constexpr typename std::enable_if<enable_flag_operators<E>::value, E>::type \
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operator op (E const lhs, E const rhs) { \
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using underlying = typename std::underlying_type<E>::type; \
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return static_cast<E>( \
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static_cast<underlying>(lhs) op static_cast<underlying>(rhs)); \
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} \
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\
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template<typename E> \
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typename std::enable_if<enable_flag_operators<E>::value, E&>::type \
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operator op##= (E& lhs, E const rhs) { \
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using underlying = typename std::underlying_type<E>::type; \
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lhs = static_cast<E>( \
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static_cast<underlying>(lhs) op static_cast<underlying>(rhs)); \
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return lhs; \
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}
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ENUM_OPERATOR(|)
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ENUM_OPERATOR(&)
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ENUM_OPERATOR(^)
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template<typename E>
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constexpr typename std::enable_if<enable_flag_operators<E>::value, E>::type
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operator~ (E const operand) {
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using underlying = typename std::underlying_type<E>::type;
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return static_cast<E>(~static_cast<underlying>(operand));
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}
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template<typename E>
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constexpr typename std::enable_if<enable_flag_operators<E>::value, bool>::type
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test(E const operand) {
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using underlying = typename std::underlying_type<E>::type;
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return static_cast<underlying>(operand) != 0;
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}
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#undef ENUM_OPERATOR
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} // flags
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} // libtorrent
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#endif
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