57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
#ifndef ENTT_ENTITY_COMPONENT_HPP
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#define ENTT_ENTITY_COMPONENT_HPP
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#include <cstddef>
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#include <type_traits>
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#include "../config/config.h"
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#include "fwd.hpp"
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namespace entt {
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/*! @cond TURN_OFF_DOXYGEN */
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namespace internal {
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template<typename Type, typename = void>
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struct in_place_delete: std::bool_constant<!(std::is_move_constructible_v<Type> && std::is_move_assignable_v<Type>)> {};
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template<>
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struct in_place_delete<void>: std::false_type {};
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template<typename Type>
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struct in_place_delete<Type, std::enable_if_t<Type::in_place_delete>>
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: std::true_type {};
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template<typename Type, typename = void>
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struct page_size: std::integral_constant<std::size_t, !std::is_empty_v<ENTT_ETO_TYPE(Type)> * ENTT_PACKED_PAGE> {};
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template<>
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struct page_size<void>: std::integral_constant<std::size_t, 0u> {};
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template<typename Type>
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struct page_size<Type, std::void_t<decltype(Type::page_size)>>
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: std::integral_constant<std::size_t, Type::page_size> {};
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} // namespace internal
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/*! @endcond */
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/**
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* @brief Common way to access various properties of components.
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* @tparam Type Type of component.
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*/
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template<typename Type, typename = void>
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struct component_traits {
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static_assert(std::is_same_v<std::decay_t<Type>, Type>, "Unsupported type");
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/*! @brief Component type. */
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using type = Type;
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/*! @brief Pointer stability, default is `false`. */
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static constexpr bool in_place_delete = internal::in_place_delete<Type>::value;
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/*! @brief Page size, default is `ENTT_PACKED_PAGE` for non-empty types. */
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static constexpr std::size_t page_size = internal::page_size<Type>::value;
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};
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} // namespace entt
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#endif
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