utility.h

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#pragma once
#include "fl/type_traits.h"
 
namespace fl {

template <typename T = void> struct less {
    constexpr bool operator()(const T &lhs, const T &rhs) const {
        return lhs < rhs;
    }
};

template <> struct less<void> {
    template <typename T, typename U>
    constexpr auto operator()(T &&lhs, U &&rhs) const
        -> decltype(fl::forward<T>(lhs) < fl::forward<U>(rhs)) {
        return fl::forward<T>(lhs) < fl::forward<U>(rhs);
    }
};
 
// Backward compatibility alias
template <typename T> using DefaultLess = less<T>;
 
} // namespace fl