monostate.hpp

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//
// Created by YongGyu Lee on 11/3/23.
//
 
#ifndef VCCC_VARIANT_MONOSTATE_HPP
#define VCCC_VARIANT_MONOSTATE_HPP
 
#include <functional>
 
 
namespace vccc {
 
 
struct monostate {};
 
constexpr bool operator==(monostate, monostate) noexcept { return true; }
constexpr bool operator!=(monostate, monostate) noexcept { return false; }
constexpr bool operator< (monostate, monostate) noexcept { return false; }
constexpr bool operator> (monostate, monostate) noexcept { return false; }
constexpr bool operator<=(monostate, monostate) noexcept { return true; }
constexpr bool operator>=(monostate, monostate) noexcept { return true; }
 
 
} // namespace vccc
 
template<>
struct std::hash<::vccc::monostate> {
  std::size_t operator()(const ::vccc::monostate&) const noexcept {
    return 1998;
  }
};
 
 
#endif // VCCC_VARIANT_MONOSTATE_HPP