mirror of
https://github.com/quizhizhe/LiteLoaderBDS-1.16.40.git
synced 2025-06-05 03:43:40 +00:00
87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
#ifndef ENTT_META_POLICY_HPP
|
|
#define ENTT_META_POLICY_HPP
|
|
|
|
#include <type_traits>
|
|
|
|
namespace entt {
|
|
|
|
/*! @brief Empty class type used to request the _as ref_ policy. */
|
|
struct as_ref_t final {
|
|
/**
|
|
* @cond TURN_OFF_DOXYGEN
|
|
* Internal details not to be documented.
|
|
*/
|
|
template<typename Type>
|
|
static constexpr bool value = std::is_reference_v<Type> && !std::is_const_v<std::remove_reference_t<Type>>;
|
|
/**
|
|
* Internal details not to be documented.
|
|
* @endcond
|
|
*/
|
|
};
|
|
|
|
/*! @brief Empty class type used to request the _as cref_ policy. */
|
|
struct as_cref_t final {
|
|
/**
|
|
* @cond TURN_OFF_DOXYGEN
|
|
* Internal details not to be documented.
|
|
*/
|
|
template<typename Type>
|
|
static constexpr bool value = std::is_reference_v<Type>;
|
|
/**
|
|
* Internal details not to be documented.
|
|
* @endcond
|
|
*/
|
|
};
|
|
|
|
/*! @brief Empty class type used to request the _as-is_ policy. */
|
|
struct as_is_t final {
|
|
/**
|
|
* @cond TURN_OFF_DOXYGEN
|
|
* Internal details not to be documented.
|
|
*/
|
|
template<typename>
|
|
static constexpr bool value = true;
|
|
/**
|
|
* Internal details not to be documented.
|
|
* @endcond
|
|
*/
|
|
};
|
|
|
|
/*! @brief Empty class type used to request the _as void_ policy. */
|
|
struct as_void_t final {
|
|
/**
|
|
* @cond TURN_OFF_DOXYGEN
|
|
* Internal details not to be documented.
|
|
*/
|
|
template<typename>
|
|
static constexpr bool value = true;
|
|
/**
|
|
* Internal details not to be documented.
|
|
* @endcond
|
|
*/
|
|
};
|
|
|
|
/**
|
|
* @brief Provides the member constant `value` to true if a type also is a meta
|
|
* policy, false otherwise.
|
|
* @tparam Type Type to check.
|
|
*/
|
|
template<typename Type>
|
|
struct is_meta_policy
|
|
: std::disjunction<
|
|
std::is_same<Type, as_ref_t>,
|
|
std::is_same<Type, as_cref_t>,
|
|
std::is_same<Type, as_is_t>,
|
|
std::is_same<Type, as_void_t>> {};
|
|
|
|
/**
|
|
* @brief Helper variable template.
|
|
* @tparam Type Type to check.
|
|
*/
|
|
template<typename Type>
|
|
inline constexpr bool is_meta_policy_v = is_meta_policy<Type>::value;
|
|
|
|
} // namespace entt
|
|
|
|
#endif
|