blob: 7b17827cf821e0738b1a33790683f06ca8b2ee27 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
#ifndef ENTT_ENTITY_COMPONENT_HPP
#define ENTT_ENTITY_COMPONENT_HPP
#include <cstddef>
#include <type_traits>
#include "../config/config.h"
#include "fwd.hpp"
namespace entt {
/*! @cond TURN_OFF_DOXYGEN */
namespace internal {
template<typename Type, typename = void>
struct in_place_delete: std::bool_constant<!(std::is_move_constructible_v<Type> && std::is_move_assignable_v<Type>)> {};
template<>
struct in_place_delete<void>: std::false_type {};
template<typename Type>
struct in_place_delete<Type, std::enable_if_t<Type::in_place_delete>>
: std::true_type {};
template<typename Type, typename = void>
struct page_size: std::integral_constant<std::size_t, !std::is_empty_v<ENTT_ETO_TYPE(Type)> * ENTT_PACKED_PAGE> {};
template<>
struct page_size<void>: std::integral_constant<std::size_t, 0u> {};
template<typename Type>
struct page_size<Type, std::void_t<decltype(Type::page_size)>>
: std::integral_constant<std::size_t, Type::page_size> {};
} // namespace internal
/*! @endcond */
/**
* @brief Common way to access various properties of components.
* @tparam Type Type of component.
*/
template<typename Type, typename = void>
struct component_traits {
static_assert(std::is_same_v<std::decay_t<Type>, Type>, "Unsupported type");
/*! @brief Component type. */
using type = Type;
/*! @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 std::size_t page_size = internal::page_size<Type>::value;
};
} // namespace entt
#endif
|
