nullopt.h

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#pragma once
 
#include "di/types/strong_ordering.h"
 
namespace di::vocab {
struct NullOpt {
    constexpr explicit NullOpt(int) {}
 
    constexpr friend auto operator==(NullOpt, NullOpt) -> bool { return true; }
    constexpr friend auto operator<=>(NullOpt, NullOpt) -> types::strong_ordering {
        return types::strong_ordering::equal;
    }
};
 
constexpr inline auto nullopt = NullOpt { 0 };
}
 
namespace di {
using vocab::nullopt;
}