obs-StreamFX/source/util/util-bitmask.hpp

/*
 * Modern effects for a modern Streamer
 * Copyright (C) 2020 Michael Fabian Dirks
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
*/

#pragma once
#include "warning-disable.hpp"
#include <cstddef>
#include <type_traits>
#include "warning-enable.hpp"

template<typename Enum>
struct enable_bitmask_operators {
	static const bool enable = false;
};

template<typename Enum>
typename std::enable_if<enable_bitmask_operators<Enum>::enable, Enum>::type operator|(Enum lhs, Enum rhs)
{
	using underlying = typename std::underlying_type<Enum>::type;
	return static_cast<Enum>(static_cast<underlying>(lhs) | static_cast<underlying>(rhs));
}

template<typename Enum>
typename std::enable_if<enable_bitmask_operators<Enum>::enable, Enum>::type operator&(Enum lhs, Enum rhs)
{
	using underlying = typename std::underlying_type<Enum>::type;
	return static_cast<Enum>(static_cast<underlying>(lhs) & static_cast<underlying>(rhs));
}

template<typename Enum>
typename std::enable_if<enable_bitmask_operators<Enum>::enable, bool>::type any(Enum lhs)
{
	using underlying = typename std::underlying_type<Enum>::type;
	return static_cast<underlying>(lhs) != static_cast<underlying>(0);
}

template<typename Enum>
typename std::enable_if<enable_bitmask_operators<Enum>::enable, bool>::type exact(Enum lhs, Enum rhs)
{
	using underlying = typename std::underlying_type<Enum>::type;
	return static_cast<underlying>(lhs) == static_cast<underlying>(rhs);
}

template<typename Enum>
typename std::enable_if<enable_bitmask_operators<Enum>::enable, bool>::type has(Enum lhs, Enum rhs)
{
	using underlying = typename std::underlying_type<Enum>::type;
	return (lhs & rhs) == rhs;
}

#define P_ENABLE_BITMASK_OPERATORS(x)    \
	template<>                           \
	struct enable_bitmask_operators<x> { \
		static const bool enable = true; \
	};