compare.h

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#pragma once
 
namespace bmb {
 
struct compare_three_way {
    template <typename T, typename U>
    auto operator()(const T& x, const U& y) const {
        return x <=> y;
    }
};
 
struct equal_to {
    template <typename T, typename U>
    bool operator()(const T& x, const U& y) const {
        return x == y;
    }
};
 
struct not_equal_to {
    template <typename T, typename U>
    bool operator()(const T& x, const U& y) const {
        return x != y;
    }
};
 
struct less {
    template <typename T, typename U>
    bool operator()(const T& x, const U& y) const {
        return x < y;
    }
};
 
struct less_equal {
    template <typename T, typename U>
    bool operator()(const T& x, const U& y) const {
        return x <= y;
    }
};
 
struct greater {
    template <typename T, typename U>
    bool operator()(const T& x, const U& y) const {
        return x > y;
    }
};
 
struct greater_equal {
    template <typename T, typename U>
    bool operator()(const T& x, const U& y) const {
        return x >= y;
    }
};
 
}  // namespace bmb