between_exclusive.h

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#pragma once
 
#include "di/function/curry_back.h"
#include "di/function/equal_or_greater.h"
#include "di/function/less.h"
 
namespace di::function {
struct BetweenExclusive : CurryBack<BetweenExclusive> {
    template<typename T, typename U = T, typename V = T>
    constexpr static auto operator()(T const& value, U const& lower, V const& upper) -> bool
    requires(requires {
        di::equal_or_greater(value, lower);
        di::less(value, upper);
    })
    constexpr static auto operator()(T const& value, U const& lower, V const& upper) -> bool {…}
    {
        return di::equal_or_greater(value, lower) && di::less(value, upper);
    }
 
    using CurryBack<BetweenExclusive>::operator();
    constexpr static auto max_arity = 3ZU;
};
struct BetweenExclusive : CurryBack<BetweenExclusive> {…};
 
constexpr inline auto between_exclusive = BetweenExclusive {};
}
 
namespace di {
using function::between_exclusive;
using function::BetweenExclusive;
}