/**
 * Copyright (c) 2019, Timothy Stack
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * * 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.
 * * Neither the name of Timothy Stack 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 REGENTS 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 REGENTS 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.
 */

#ifndef lnav_enum_util_hh
#define lnav_enum_util_hh

#include <cstdint>
#include <type_traits>

namespace lnav::enums {

template<typename E>
constexpr auto
to_underlying(E e) noexcept
{
    return static_cast<std::underlying_type_t<E>>(e);
}

template<typename T>
struct bitset {
    template<typename... Args>
    bitset(Args... args)
    {
        this->bs_data = ((1 << to_underlying<T>(args)) | ... | 0);
    }

    template<T arg>
    [[nodiscard]] constexpr bool is_set() const
    {
        static_assert(to_underlying(arg) >= 0);
        static_assert(to_underlying(arg) < sizeof(this->bs_data) * 8);

        return this->bs_data & 1 << to_underlying(arg);
    }

    [[nodiscard]] bool is_set(T arg) const
    {
        return this->bs_data & 1 << to_underlying(arg);
    }

    template<T arg>
    void set()
    {
        static_assert(to_underlying(arg) >= 0);
        static_assert(to_underlying(arg) < sizeof(this->bs_data) * 8);

        this->bs_data |= 1 << to_underlying(arg);
    }

    void set(T arg) { this->bs_data |= 1 << to_underlying(arg); }

    uint64_t bs_data;
};

}  // namespace lnav::enums

#endif
