policy.hpp

#ifndef ENTT_META_POLICY_HPP
#define ENTT_META_POLICY_HPP
 
#include <type_traits>
 
namespace entt {
 
struct as_ref_t final {
    template<typename Type>
    static constexpr bool value = std::is_reference_v<Type> && !std::is_const_v<std::remove_reference_t<Type>>;
};
 
struct as_cref_t final {
    template<typename Type>
    static constexpr bool value = std::is_reference_v<Type>;
};
 
struct as_is_t final {
    template<typename>
    static constexpr bool value = true;
};
 
struct as_void_t final {
    template<typename>
    static constexpr bool value = true;
};
 
template<typename Type>
struct is_meta_policy
    : std::bool_constant<std::is_same_v<Type, as_ref_t> || std::is_same_v<Type, as_cref_t> || std::is_same_v<Type, as_is_t> || std::is_same_v<Type, as_void_t>> {};
 
template<typename Type>
inline constexpr bool is_meta_policy_v = is_meta_policy<Type>::value;
 
} // namespace entt
 
#endif