build: remove entt library

include/entt/entity/component.hpp

@@ -1,59 +0,0 @@
-#ifndef ENTT_ENTITY_COMPONENT_HPP
-#define ENTT_ENTITY_COMPONENT_HPP
-
-#include "../config/config.h"
-#include "../core/concepts.hpp"
-#include "../stl/concepts.hpp"
-#include "../stl/cstddef.hpp"
-#include "../stl/type_traits.hpp"
-#include "fwd.hpp"
-
-namespace entt {
-
-/*! @cond ENTT_INTERNAL */
-namespace internal {
-
-template<typename Type>
-struct in_place_delete: stl::bool_constant<!(stl::is_move_constructible_v<Type> && stl::is_move_assignable_v<Type>)> {};
-
-template<>
-struct in_place_delete<void>: stl::false_type {};
-
-template<typename Type>
-requires Type::in_place_delete
-struct in_place_delete<Type>: stl::true_type {};
-
-template<typename Type>
-struct page_size: stl::integral_constant<stl::size_t, !stl::is_empty_v<ENTT_ETO_TYPE(Type)> * ENTT_PACKED_PAGE> {};
-
-template<>
-struct page_size<void>: stl::integral_constant<stl::size_t, 0u> {};
-
-template<typename Type>
-requires stl::is_convertible_v<decltype(Type::page_size), stl::size_t>
-struct page_size<Type>: stl::integral_constant<stl::size_t, Type::page_size> {};
-
-} // namespace internal
-/*! @endcond */
-
-/**
- * @brief Common way to access various properties of components.
- * @tparam Type Element type.
- * @tparam Entity A valid entity type.
- */
-template<cvref_unqualified Type, typename Entity>
-struct component_traits {
-    /*! @brief Element type. */
-    using element_type = Type;
-    /*! @brief Underlying entity identifier. */
-    using entity_type = Entity;
-
-    /*! @brief Pointer stability, default is `false`. */
-    static constexpr bool in_place_delete = internal::in_place_delete<Type>::value;
-    /*! @brief Page size, default is `ENTT_PACKED_PAGE` for non-empty types. */
-    static constexpr stl::size_t page_size = internal::page_size<Type>::value;
-};
-
-} // namespace entt
-
-#endif