bit_floor.h

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#pragma once
 
#include "di/bit/operation/bit_width.h"
 
namespace di::bit {
namespace detail {
    struct BitFloorFunction {
        template<concepts::UnsignedInteger T>
        constexpr auto operator()(T value) const -> T {
            if (value == 0) {
                return 0;
            }
            return T(1) << (bit_width(T(value - 1)));
        }
    };
}
 
constexpr inline auto bit_floor = detail::BitFloorFunction {};
}
 
namespace di {
using bit::bit_floor;
}