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#ifndef ENTT_CORE_MONOSTATE_HPP
#define ENTT_CORE_MONOSTATE_HPP
#include "../config/config.h"
#include "fwd.hpp"
namespace entt {
/**
* @brief Minimal implementation of the monostate pattern.
*
* A minimal, yet complete configuration system built on top of the monostate
* pattern. Thread safe by design, it works only with basic types like `int`s or
* `bool`s.<br/>
* Multiple types and therefore more than one value can be associated with a
* single key. Because of this, users must pay attention to use the same type
* both during an assignment and when they try to read back their data.
* Otherwise, they can incur in unexpected results.
*/
template<id_type>
struct monostate {
/**
* @brief Assigns a value of a specific type to a given key.
* @tparam Type Type of the value to assign.
* @param val User data to assign to the given key.
* @return This monostate object.
*/
template<typename Type>
monostate &operator=(Type val) noexcept {
value<Type> = val;
return *this;
}
/**
* @brief Gets a value of a specific type for a given key.
* @tparam Type Type of the value to get.
* @return Stored value, if any.
*/
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{};
};
/**
* @brief Helper variable template.
* @tparam Value Value used to differentiate between different variables.
*/
template<id_type Value>
// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
inline monostate<Value> monostate_v{};
} // namespace entt
#endif
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