align_down.h

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#pragma once
 
#include "di/function/curry_back.h"
#include "di/meta/language.h"
#include "di/meta/util.h"
 
namespace di::math {
namespace detail {
    struct AlignDownFunction {
        template<concepts::Integer T>
        constexpr auto operator()(T a, meta::TypeIdentity<T> b) const -> T {
            return a / b * b;
        }
    };
}
 
constexpr inline auto align_down = function::curry_back(detail::AlignDownFunction {}, meta::c_<2ZU>);
}
 
namespace di {
using math::align_down;
}