bitmask.h
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/****************************************************************************
*
* Copyright (c) 2020 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file bitmask.h
* @brief Provides SFINAE for type safe templated bitmask operations
* @author Nuno Marques <nuno.marques@dronesolutions.io>
*
*/
#pragma once
#if defined(__cplusplus) && (defined(__PX4_POSIX) || defined(__PX4_LINUX))
#include<type_traits>
template<typename E>
struct enable_bitmask_operators {
static const bool enable = false;
};
namespace px4
{
#define ENABLE_BIT_OPERATORS(E) \
template<> \
struct enable_bitmask_operators<E> \
{ \
static const bool enable = true; \
};
template<typename E>
typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type
operator==(E lhs, E rhs)
{
typedef typename std::underlying_type<E>::type underlying;
return static_cast<E>(
static_cast<underlying>(lhs) ==
static_cast<underlying>(rhs)
);
}
template<typename E>
typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type
operator~(E lhs)
{
typedef typename std::underlying_type<E>::type underlying;
return static_cast<E>(
~static_cast<underlying>(lhs)
);
}
template<typename E>
typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type
operator|(E lhs, E rhs)
{
typedef typename std::underlying_type<E>::type underlying;
return static_cast<E>(
static_cast<underlying>(lhs) |
static_cast<underlying>(rhs)
);
}
template<typename E>
typename std::enable_if<enable_bitmask_operators<E>::enable, E &>::type
operator|=(E &lhs, E rhs)
{
typedef typename std::underlying_type<E>::type underlying;
lhs = static_cast<E>(
static_cast<underlying>(lhs) |
static_cast<underlying>(rhs)
);
return lhs;
}
template<typename E>
typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type
operator&(E lhs, E rhs)
{
typedef typename std::underlying_type<E>::type underlying;
return static_cast<E>(
static_cast<underlying>(lhs) &
static_cast<underlying>(rhs)
);
}
template<typename E>
typename std::enable_if<enable_bitmask_operators<E>::enable, E &>::type
operator&=(E &lhs, E rhs)
{
typedef typename std::underlying_type<E>::type underlying;
lhs = static_cast<E>(
static_cast<underlying>(lhs) &
static_cast<underlying>(rhs)
);
return lhs;
}
template<typename E>
typename std::enable_if<enable_bitmask_operators<E>::enable, E>::type
operator^(E lhs, E rhs)
{
typedef typename std::underlying_type<E>::type underlying;
return static_cast<E>(
static_cast<underlying>(lhs) ^
static_cast<underlying>(rhs)
);
}
template<typename E>
typename std::enable_if<enable_bitmask_operators<E>::enable, E &>::type
operator^=(E &lhs, E rhs)
{
typedef typename std::underlying_type<E>::type underlying;
lhs = static_cast<E>(
static_cast<underlying>(lhs) ^
static_cast<underlying>(rhs)
);
return lhs;
}
} /* namespace px4 */
#endif /* __cplusplus && (__PX4_POSIX || __PX4_LINUX) */