EnTT 3.13.2
Loading...
Searching...
No Matches
node.hpp
1#ifndef ENTT_META_NODE_HPP
2#define ENTT_META_NODE_HPP
3
4#include <cstddef>
5#include <memory>
6#include <type_traits>
7#include <utility>
8#include "../config/config.h"
9#include "../container/dense_map.hpp"
10#include "../core/attribute.h"
11#include "../core/enum.hpp"
12#include "../core/fwd.hpp"
13#include "../core/type_info.hpp"
14#include "../core/type_traits.hpp"
15#include "../core/utility.hpp"
16#include "context.hpp"
17#include "type_traits.hpp"
18
19namespace entt {
20
21class meta_any;
22class meta_type;
23struct meta_handle;
24
26namespace internal {
27
28enum class meta_traits : std::uint32_t {
29 is_none = 0x0000,
30 is_const = 0x0001,
31 is_static = 0x0002,
32 is_arithmetic = 0x0004,
33 is_integral = 0x0008,
34 is_signed = 0x0010,
35 is_array = 0x0020,
36 is_enum = 0x0040,
37 is_class = 0x0080,
38 is_meta_pointer_like = 0x0100,
39 is_meta_sequence_container = 0x0200,
40 is_meta_associative_container = 0x0400,
41 _entt_enum_as_bitmask
42};
43
44struct meta_type_node;
45
46struct meta_prop_node {
47 meta_type_node (*type)(const meta_context &) noexcept {};
48 std::shared_ptr<void> value{};
49};
50
51struct meta_base_node {
52 meta_type_node (*type)(const meta_context &) noexcept {};
53 const void *(*cast)(const void *) noexcept {};
54};
55
56struct meta_conv_node {
57 meta_any (*conv)(const meta_ctx &, const void *){};
58};
59
60struct meta_ctor_node {
61 using size_type = std::size_t;
62
63 size_type arity{0u};
64 meta_type (*arg)(const meta_ctx &, const size_type) noexcept {};
65 meta_any (*invoke)(const meta_ctx &, meta_any *const){};
66};
67
68struct meta_dtor_node {
69 void (*dtor)(void *){};
70};
71
72struct meta_data_node {
73 using size_type = std::size_t;
74
75 meta_traits traits{meta_traits::is_none};
76 size_type arity{0u};
77 meta_type_node (*type)(const meta_context &) noexcept {};
78 meta_type (*arg)(const meta_ctx &, const size_type) noexcept {};
79 bool (*set)(meta_handle, meta_any){};
80 meta_any (*get)(const meta_ctx &, meta_handle){};
81 dense_map<id_type, meta_prop_node, identity> prop{};
82};
83
84struct meta_func_node {
85 using size_type = std::size_t;
86
87 meta_traits traits{meta_traits::is_none};
88 size_type arity{0u};
89 meta_type_node (*ret)(const meta_context &) noexcept {};
90 meta_type (*arg)(const meta_ctx &, const size_type) noexcept {};
91 meta_any (*invoke)(const meta_ctx &, meta_handle, meta_any *const){};
92 std::shared_ptr<meta_func_node> next{};
93 dense_map<id_type, meta_prop_node, identity> prop{};
94};
95
96struct meta_template_node {
97 using size_type = std::size_t;
98
99 size_type arity{0u};
100 meta_type_node (*type)(const meta_context &) noexcept {};
101 meta_type_node (*arg)(const meta_context &, const size_type) noexcept {};
102};
103
104struct meta_type_descriptor {
105 dense_map<id_type, meta_ctor_node, identity> ctor{};
106 dense_map<id_type, meta_base_node, identity> base{};
107 dense_map<id_type, meta_conv_node, identity> conv{};
108 dense_map<id_type, meta_data_node, identity> data{};
109 dense_map<id_type, meta_func_node, identity> func{};
110 dense_map<id_type, meta_prop_node, identity> prop{};
111};
112
113struct meta_type_node {
114 using size_type = std::size_t;
115
116 const type_info *info{};
117 id_type id{};
118 meta_traits traits{meta_traits::is_none};
119 size_type size_of{0u};
120 meta_type_node (*resolve)(const meta_context &) noexcept {};
121 meta_type_node (*remove_pointer)(const meta_context &) noexcept {};
122 meta_any (*default_constructor)(const meta_ctx &){};
123 double (*conversion_helper)(void *, const void *){};
124 meta_any (*from_void)(const meta_ctx &, void *, const void *){};
125 meta_template_node templ{};
126 meta_dtor_node dtor{};
127 std::shared_ptr<meta_type_descriptor> details{};
128};
129
130template<auto Member>
131auto *look_for(const meta_context &context, const meta_type_node &node, const id_type id) {
132 if(node.details) {
133 if(const auto it = (node.details.get()->*Member).find(id); it != (node.details.get()->*Member).cend()) {
134 return &it->second;
135 }
136
137 for(auto &&curr: node.details->base) {
138 if(auto *elem = look_for<Member>(context, curr.second.type(context), id); elem) {
139 return elem;
140 }
141 }
142 }
143
144 return static_cast<typename std::remove_reference_t<decltype(node.details.get()->*Member)>::mapped_type *>(nullptr);
145}
146
147template<typename Type>
148meta_type_node resolve(const meta_context &) noexcept;
149
150template<typename... Args>
151[[nodiscard]] auto meta_arg_node(const meta_context &context, type_list<Args...>, [[maybe_unused]] const std::size_t index) noexcept {
152 [[maybe_unused]] std::size_t pos{};
153 meta_type_node (*value)(const meta_context &) noexcept = nullptr;
154 ((value = (pos++ == index ? &resolve<std::remove_cv_t<std::remove_reference_t<Args>>> : value)), ...);
155 ENTT_ASSERT(value != nullptr, "Out of bounds");
156 return value(context);
157}
158
159[[nodiscard]] inline const void *try_cast(const meta_context &context, const meta_type_node &from, const meta_type_node &to, const void *instance) noexcept {
160 if(from.info && to.info && *from.info == *to.info) {
161 return instance;
162 }
163
164 if(from.details) {
165 for(auto &&curr: from.details->base) {
166 if(const void *elem = try_cast(context, curr.second.type(context), to, curr.second.cast(instance)); elem) {
167 return elem;
168 }
169 }
170 }
171
172 return nullptr;
173}
174
175template<typename Func>
176[[nodiscard]] inline auto try_convert(const meta_context &context, const meta_type_node &from, const type_info &to, const bool arithmetic_or_enum, const void *instance, Func func) {
177 if(from.info && *from.info == to) {
178 return func(instance, from);
179 }
180
181 if(from.details) {
182 if(auto it = from.details->conv.find(to.hash()); it != from.details->conv.cend()) {
183 return func(instance, it->second);
184 }
185
186 for(auto &&curr: from.details->base) {
187 if(auto other = try_convert(context, curr.second.type(context), to, arithmetic_or_enum, curr.second.cast(instance), func); other) {
188 return other;
189 }
190 }
191 }
192
193 if(from.conversion_helper && arithmetic_or_enum) {
194 return func(instance, from.conversion_helper);
195 }
196
197 return func(instance);
198}
199
200[[nodiscard]] inline const meta_type_node *try_resolve(const meta_context &context, const type_info &info) noexcept {
201 const auto it = context.value.find(info.hash());
202 return it != context.value.end() ? &it->second : nullptr;
203}
204
205template<typename Type>
206[[nodiscard]] meta_type_node resolve(const meta_context &context) noexcept {
207 static_assert(std::is_same_v<Type, std::remove_const_t<std::remove_reference_t<Type>>>, "Invalid type");
208
209 if(auto *elem = try_resolve(context, type_id<Type>()); elem) {
210 return *elem;
211 }
212
213 meta_type_node node{
214 &type_id<Type>(),
215 type_id<Type>().hash(),
216 (std::is_arithmetic_v<Type> ? meta_traits::is_arithmetic : meta_traits::is_none)
217 | (std::is_integral_v<Type> ? meta_traits::is_integral : meta_traits::is_none)
218 | (std::is_signed_v<Type> ? meta_traits::is_signed : meta_traits::is_none)
219 | (std::is_array_v<Type> ? meta_traits::is_array : meta_traits::is_none)
220 | (std::is_enum_v<Type> ? meta_traits::is_enum : meta_traits::is_none)
221 | (std::is_class_v<Type> ? meta_traits::is_class : meta_traits::is_none)
222 | (is_meta_pointer_like_v<Type> ? meta_traits::is_meta_pointer_like : meta_traits::is_none)
223 | (is_complete_v<meta_sequence_container_traits<Type>> ? meta_traits::is_meta_sequence_container : meta_traits::is_none)
224 | (is_complete_v<meta_associative_container_traits<Type>> ? meta_traits::is_meta_associative_container : meta_traits::is_none),
225 size_of_v<Type>,
226 &resolve<Type>,
227 &resolve<std::remove_cv_t<std::remove_pointer_t<Type>>>};
228
229 if constexpr(std::is_default_constructible_v<Type>) {
230 node.default_constructor = +[](const meta_ctx &ctx) {
231 return meta_any{ctx, std::in_place_type<Type>};
232 };
233 }
234
235 if constexpr(std::is_arithmetic_v<Type>) {
236 node.conversion_helper = +[](void *bin, const void *value) {
237 return bin ? static_cast<double>(*static_cast<Type *>(bin) = static_cast<Type>(*static_cast<const double *>(value))) : static_cast<double>(*static_cast<const Type *>(value));
238 };
239 } else if constexpr(std::is_enum_v<Type>) {
240 node.conversion_helper = +[](void *bin, const void *value) {
241 return bin ? static_cast<double>(*static_cast<Type *>(bin) = static_cast<Type>(static_cast<std::underlying_type_t<Type>>(*static_cast<const double *>(value)))) : static_cast<double>(*static_cast<const Type *>(value));
242 };
243 }
244
245 if constexpr(!std::is_void_v<Type> && !std::is_function_v<Type>) {
246 node.from_void = +[](const meta_ctx &ctx, void *element, const void *as_const) {
247 if(element) {
248 return meta_any{ctx, std::in_place_type<std::decay_t<Type> &>, *static_cast<std::decay_t<Type> *>(element)};
249 }
250
251 return meta_any{ctx, std::in_place_type<const std::decay_t<Type> &>, *static_cast<const std::decay_t<Type> *>(as_const)};
252 };
253 }
254
255 if constexpr(is_complete_v<meta_template_traits<Type>>) {
256 node.templ = meta_template_node{
257 meta_template_traits<Type>::args_type::size,
258 &resolve<typename meta_template_traits<Type>::class_type>,
259 +[](const meta_context &area, const std::size_t index) noexcept { return meta_arg_node(area, typename meta_template_traits<Type>::args_type{}, index); }};
260 }
261
262 return node;
263}
264
265} // namespace internal
268} // namespace entt
269
270#endif
EnTT default namespace.
Definition dense_map.hpp:21
constexpr std::size_t size_of_v
Helper variable template.
std::uint32_t id_type
Alias declaration for type identifiers.
Definition fwd.hpp:13
constexpr bool is_complete_v
Helper variable template.
constexpr get_t< Type... > get
Variable template for lists of observed components.
Definition fwd.hpp:157
constexpr auto is_meta_pointer_like_v
Helper variable template.
meta_type resolve(const meta_ctx &ctx) noexcept
Returns the meta type associated with a given type.
Definition resolve.hpp:21