abs_unsigned.h

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#pragma once
 
#include "di/function/pipeline.h"
#include "di/math/numeric_limits.h"
#include "di/meta/language.h"
 
namespace di::math {
namespace detail {
    struct AbsUnsignedFunction : function::pipeline::EnablePipeline {
        template<concepts::Integral T>
        constexpr auto operator()(T value) const {
            using R = meta::MakeUnsigned<T>;
            if constexpr (concepts::SignedIntegral<T>) {
                if (value == NumericLimits<T>::min) {
                    return R(value);
                }
                if (value < 0) {
                    return R(-value);
                }
            }
            return R(value);
        }
    };
}
 
constexpr inline auto abs_unsigned = detail::AbsUnsignedFunction {};
}
 
namespace di {
using math::abs_unsigned;
}