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114 lines
4.4 KiB
C++
114 lines
4.4 KiB
C++
/****************************************************************************
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*
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* Copyright (c) 2020 PX4 Development Team. 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, are 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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* 2. 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
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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/**
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* @file bitmask.h
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* @brief Provides SFINAE for type safe templated bitmask operations
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* @author Nuno Marques <nuno.marques@dronesolutions.io>
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*
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*/
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#pragma once
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#if defined(__cplusplus) && (defined(__PX4_POSIX) || defined(__PX4_LINUX))
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#include <type_traits>
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template <typename E>
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struct enable_bitmask_operators {
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static const bool enable = false;
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};
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namespace px4 {
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#define ENABLE_BIT_OPERATORS(E) \
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template <> \
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struct enable_bitmask_operators<E> { \
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static const bool enable = true; \
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};
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template <typename E>
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typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type operator==(E lhs, E rhs) {
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typedef typename std::underlying_type<E>::type underlying;
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return static_cast<E>(static_cast<underlying>(lhs) == static_cast<underlying>(rhs));
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}
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template <typename E>
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typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type operator~(E lhs) {
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typedef typename std::underlying_type<E>::type underlying;
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return static_cast<E>(~static_cast<underlying>(lhs));
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}
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template <typename E>
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typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type operator|(E lhs, E rhs) {
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typedef typename std::underlying_type<E>::type underlying;
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return static_cast<E>(static_cast<underlying>(lhs) | static_cast<underlying>(rhs));
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}
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template <typename E>
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typename std::enable_if<enable_bitmask_operators<E>::enable, E &>::type operator|=(E &lhs, E rhs) {
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typedef typename std::underlying_type<E>::type underlying;
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lhs = static_cast<E>(static_cast<underlying>(lhs) | static_cast<underlying>(rhs));
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return lhs;
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}
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template <typename E>
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typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type operator&(E lhs, E rhs) {
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typedef typename std::underlying_type<E>::type underlying;
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return static_cast<E>(static_cast<underlying>(lhs) & static_cast<underlying>(rhs));
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}
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template <typename E>
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typename std::enable_if<enable_bitmask_operators<E>::enable, E &>::type operator&=(E &lhs, E rhs) {
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typedef typename std::underlying_type<E>::type underlying;
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lhs = static_cast<E>(static_cast<underlying>(lhs) & static_cast<underlying>(rhs));
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return lhs;
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}
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template <typename E>
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typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type operator^(E lhs, E rhs) {
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typedef typename std::underlying_type<E>::type underlying;
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return static_cast<E>(static_cast<underlying>(lhs) ^ static_cast<underlying>(rhs));
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}
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template <typename E>
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typename std::enable_if<enable_bitmask_operators<E>::enable, E &>::type operator^=(E &lhs, E rhs) {
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typedef typename std::underlying_type<E>::type underlying;
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lhs = static_cast<E>(static_cast<underlying>(lhs) ^ static_cast<underlying>(rhs));
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return lhs;
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}
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} /* namespace px4 */
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#endif /* __cplusplus && (__PX4_POSIX || __PX4_LINUX) */
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