monostate.hpp

#ifndef ENTT_CORE_MONOSTATE_HPP
#define ENTT_CORE_MONOSTATE_HPP
 
#include "../config/config.h"
#include "fwd.hpp"
 
namespace entt {

template<id_type>
struct monostate {
    template<typename Type>
    monostate &operator=(Type val) noexcept {
        value<Type> = val;
        return *this;
    }

    template<typename Type>
    operator Type() const noexcept {
        return value<Type>;
    }
 
private:
    template<typename Type>
    // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
    inline static ENTT_MAYBE_ATOMIC(Type) value{};
};

template<id_type Value>
// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
inline monostate<Value> monostate_v{};
 
} // namespace entt
 
#endif