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Diffstat (limited to 'deps/include/entt/meta/meta.hpp')
| -rw-r--r-- | deps/include/entt/meta/meta.hpp | 2026 |
1 files changed, 2026 insertions, 0 deletions
diff --git a/deps/include/entt/meta/meta.hpp b/deps/include/entt/meta/meta.hpp new file mode 100644 index 0000000..64419c1 --- /dev/null +++ b/deps/include/entt/meta/meta.hpp @@ -0,0 +1,2026 @@ +#ifndef ENTT_META_META_HPP
+#define ENTT_META_META_HPP
+
+#include <array>
+#include <cstddef>
+#include <iterator>
+#include <memory>
+#include <type_traits>
+#include <utility>
+#include "../config/config.h"
+#include "../core/any.hpp"
+#include "../core/fwd.hpp"
+#include "../core/iterator.hpp"
+#include "../core/type_info.hpp"
+#include "../core/type_traits.hpp"
+#include "../core/utility.hpp"
+#include "../locator/locator.hpp"
+#include "adl_pointer.hpp"
+#include "context.hpp"
+#include "fwd.hpp"
+#include "node.hpp"
+#include "range.hpp"
+#include "type_traits.hpp"
+
+namespace entt {
+
+class meta_any;
+class meta_type;
+
+/*! @brief Proxy object for sequence containers. */
+class meta_sequence_container {
+ class meta_iterator;
+
+public:
+ /*! @brief Unsigned integer type. */
+ using size_type = std::size_t;
+ /*! @brief Meta iterator type. */
+ using iterator = meta_iterator;
+
+ /*! @brief Default constructor. */
+ meta_sequence_container() = default;
+
+ /**
+ * @brief Context aware constructor.
+ * @param area The context from which to search for meta types.
+ */
+ meta_sequence_container(const meta_ctx &area) noexcept
+ : ctx{&area} {}
+
+ /**
+ * @brief Rebinds a proxy object to a sequence container type.
+ * @tparam Type Type of container to wrap.
+ * @param instance The container to wrap.
+ */
+ template<typename Type>
+ void rebind(Type &instance) noexcept {
+ value_type_node = &internal::resolve<typename Type::value_type>;
+ const_reference_node = &internal::resolve<std::remove_const_t<std::remove_reference_t<typename Type::const_reference>>>;
+ size_fn = meta_sequence_container_traits<std::remove_const_t<Type>>::size;
+ clear_fn = meta_sequence_container_traits<std::remove_const_t<Type>>::clear;
+ reserve_fn = meta_sequence_container_traits<std::remove_const_t<Type>>::reserve;
+ resize_fn = meta_sequence_container_traits<std::remove_const_t<Type>>::resize;
+ begin_fn = meta_sequence_container_traits<std::remove_const_t<Type>>::begin;
+ end_fn = meta_sequence_container_traits<std::remove_const_t<Type>>::end;
+ insert_fn = meta_sequence_container_traits<std::remove_const_t<Type>>::insert;
+ erase_fn = meta_sequence_container_traits<std::remove_const_t<Type>>::erase;
+ const_only = std::is_const_v<Type>;
+ data = &instance;
+ }
+
+ [[nodiscard]] inline meta_type value_type() const noexcept;
+ [[nodiscard]] inline size_type size() const noexcept;
+ inline bool resize(const size_type);
+ inline bool clear();
+ inline bool reserve(const size_type);
+ [[nodiscard]] inline iterator begin();
+ [[nodiscard]] inline iterator end();
+ inline iterator insert(const iterator &, meta_any);
+ inline iterator erase(const iterator &);
+ [[nodiscard]] inline meta_any operator[](const size_type);
+ [[nodiscard]] inline explicit operator bool() const noexcept;
+
+private:
+ const meta_ctx *ctx{&locator<meta_ctx>::value_or()};
+ internal::meta_type_node (*value_type_node)(const internal::meta_context &){};
+ internal::meta_type_node (*const_reference_node)(const internal::meta_context &){};
+ size_type (*size_fn)(const void *){};
+ bool (*clear_fn)(void *){};
+ bool (*reserve_fn)(void *, const size_type){};
+ bool (*resize_fn)(void *, const size_type){};
+ iterator (*begin_fn)(const meta_ctx &, void *, const void *){};
+ iterator (*end_fn)(const meta_ctx &, void *, const void *){};
+ iterator (*insert_fn)(const meta_ctx &, void *, const void *, const void *, const iterator &){};
+ iterator (*erase_fn)(const meta_ctx &, void *, const iterator &){};
+ const void *data{};
+ bool const_only{};
+};
+
+/*! @brief Proxy object for associative containers. */
+class meta_associative_container {
+ class meta_iterator;
+
+public:
+ /*! @brief Unsigned integer type. */
+ using size_type = std::size_t;
+ /*! @brief Meta iterator type. */
+ using iterator = meta_iterator;
+
+ /*! @brief Default constructor. */
+ meta_associative_container() = default;
+
+ /**
+ * @brief Context aware constructor.
+ * @param area The context from which to search for meta types.
+ */
+ meta_associative_container(const meta_ctx &area) noexcept
+ : ctx{&area} {}
+
+ /**
+ * @brief Rebinds a proxy object to an associative container type.
+ * @tparam Type Type of container to wrap.
+ * @param instance The container to wrap.
+ */
+ template<typename Type>
+ void rebind(Type &instance) noexcept {
+ key_type_node = &internal::resolve<typename Type::key_type>;
+ value_type_node = &internal::resolve<typename Type::value_type>;
+
+ if constexpr(!meta_associative_container_traits<std::remove_const_t<Type>>::key_only) {
+ mapped_type_node = &internal::resolve<typename Type::mapped_type>;
+ }
+
+ size_fn = &meta_associative_container_traits<std::remove_const_t<Type>>::size;
+ clear_fn = &meta_associative_container_traits<std::remove_const_t<Type>>::clear;
+ reserve_fn = &meta_associative_container_traits<std::remove_const_t<Type>>::reserve;
+ begin_fn = &meta_associative_container_traits<std::remove_const_t<Type>>::begin;
+ end_fn = &meta_associative_container_traits<std::remove_const_t<Type>>::end;
+ insert_fn = &meta_associative_container_traits<std::remove_const_t<Type>>::insert;
+ erase_fn = &meta_associative_container_traits<std::remove_const_t<Type>>::erase;
+ find_fn = &meta_associative_container_traits<std::remove_const_t<Type>>::find;
+ const_only = std::is_const_v<Type>;
+ data = &instance;
+ }
+
+ [[nodiscard]] inline meta_type key_type() const noexcept;
+ [[nodiscard]] inline meta_type mapped_type() const noexcept;
+ [[nodiscard]] inline meta_type value_type() const noexcept;
+ [[nodiscard]] inline size_type size() const noexcept;
+ inline bool clear();
+ inline bool reserve(const size_type);
+ [[nodiscard]] inline iterator begin();
+ [[nodiscard]] inline iterator end();
+ inline bool insert(meta_any, meta_any);
+ inline size_type erase(meta_any);
+ [[nodiscard]] inline iterator find(meta_any);
+ [[nodiscard]] inline explicit operator bool() const noexcept;
+
+private:
+ const meta_ctx *ctx{&locator<meta_ctx>::value_or()};
+ internal::meta_type_node (*key_type_node)(const internal::meta_context &){};
+ internal::meta_type_node (*mapped_type_node)(const internal::meta_context &){};
+ internal::meta_type_node (*value_type_node)(const internal::meta_context &){};
+ size_type (*size_fn)(const void *){};
+ bool (*clear_fn)(void *){};
+ bool (*reserve_fn)(void *, const size_type){};
+ iterator (*begin_fn)(const meta_ctx &, void *, const void *){};
+ iterator (*end_fn)(const meta_ctx &, void *, const void *){};
+ bool (*insert_fn)(void *, const void *, const void *){};
+ size_type (*erase_fn)(void *, const void *){};
+ iterator (*find_fn)(const meta_ctx &, void *, const void *, const void *){};
+ const void *data{};
+ bool const_only{};
+};
+
+/*! @brief Possible modes of a meta any object. */
+using meta_any_policy = any_policy;
+
+/*! @brief Opaque wrapper for values of any type. */
+class meta_any {
+ using vtable_type = void(const internal::meta_traits op, const bool, const void *, void *);
+
+ template<typename Type>
+ static std::enable_if_t<std::is_same_v<std::remove_cv_t<std::remove_reference_t<Type>>, Type>> basic_vtable([[maybe_unused]] const internal::meta_traits req, [[maybe_unused]] const bool const_only, [[maybe_unused]] const void *value, [[maybe_unused]] void *other) {
+ if constexpr(is_meta_pointer_like_v<Type>) {
+ if(req == internal::meta_traits::is_meta_pointer_like) {
+ if constexpr(std::is_function_v<typename std::pointer_traits<Type>::element_type>) {
+ static_cast<meta_any *>(other)->emplace<Type>(*static_cast<const Type *>(value));
+ } else if constexpr(!std::is_void_v<std::remove_const_t<typename std::pointer_traits<Type>::element_type>>) {
+ using in_place_type = decltype(adl_meta_pointer_like<Type>::dereference(*static_cast<const Type *>(value)));
+
+ if constexpr(std::is_constructible_v<bool, Type>) {
+ if(const auto &pointer_like = *static_cast<const Type *>(value); pointer_like) {
+ static_cast<meta_any *>(other)->emplace<in_place_type>(adl_meta_pointer_like<Type>::dereference(pointer_like));
+ }
+ } else {
+ static_cast<meta_any *>(other)->emplace<in_place_type>(adl_meta_pointer_like<Type>::dereference(*static_cast<const Type *>(value)));
+ }
+ }
+ }
+ }
+
+ if constexpr(is_complete_v<meta_sequence_container_traits<Type>>) {
+ if(req == internal::meta_traits::is_meta_sequence_container) {
+ const_only ? static_cast<meta_sequence_container *>(other)->rebind(*static_cast<const Type *>(value)) : static_cast<meta_sequence_container *>(other)->rebind(*static_cast<Type *>(const_cast<void *>(value)));
+ }
+ }
+
+ if constexpr(is_complete_v<meta_associative_container_traits<Type>>) {
+ if(req == internal::meta_traits::is_meta_associative_container) {
+ const_only ? static_cast<meta_associative_container *>(other)->rebind(*static_cast<const Type *>(value)) : static_cast<meta_associative_container *>(other)->rebind(*static_cast<Type *>(const_cast<void *>(value)));
+ }
+ }
+ }
+
+ void release() {
+ if(node.dtor.dtor && (storage.policy() == any_policy::owner)) {
+ node.dtor.dtor(storage.data());
+ }
+ }
+
+ meta_any(const meta_any &other, any ref) noexcept
+ : storage{std::move(ref)},
+ ctx{other.ctx},
+ node{storage ? other.node : internal::meta_type_node{}},
+ vtable{storage ? other.vtable : &basic_vtable<void>} {}
+
+public:
+ /*! Default constructor. */
+ meta_any() = default;
+
+ /**
+ * @brief Context aware constructor.
+ * @param area The context from which to search for meta types.
+ */
+ meta_any(meta_ctx_arg_t, const meta_ctx &area)
+ : ctx{&area} {}
+
+ /**
+ * @brief Constructs a wrapper by directly initializing the new object.
+ * @tparam Type Type of object to use to initialize the wrapper.
+ * @tparam Args Types of arguments to use to construct the new instance.
+ * @param args Parameters to use to construct the instance.
+ */
+ template<typename Type, typename... Args>
+ explicit meta_any(std::in_place_type_t<Type>, Args &&...args)
+ : meta_any{locator<meta_ctx>::value_or(), std::in_place_type<Type>, std::forward<Args>(args)...} {}
+
+ /**
+ * @brief Constructs a wrapper by directly initializing the new object.
+ * @tparam Type Type of object to use to initialize the wrapper.
+ * @tparam Args Types of arguments to use to construct the new instance.
+ * @param area The context from which to search for meta types.
+ * @param args Parameters to use to construct the instance.
+ */
+ template<typename Type, typename... Args>
+ explicit meta_any(const meta_ctx &area, std::in_place_type_t<Type>, Args &&...args)
+ : storage{std::in_place_type<Type>, std::forward<Args>(args)...},
+ ctx{&area},
+ node{internal::resolve<std::remove_cv_t<std::remove_reference_t<Type>>>(internal::meta_context::from(*ctx))},
+ vtable{&basic_vtable<std::remove_cv_t<std::remove_reference_t<Type>>>} {}
+
+ /**
+ * @brief Constructs a wrapper from a given value.
+ * @tparam Type Type of object to use to initialize the wrapper.
+ * @param value An instance of an object to use to initialize the wrapper.
+ */
+ template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, meta_any>>>
+ meta_any(Type &&value)
+ : meta_any{locator<meta_ctx>::value_or(), std::forward<Type>(value)} {}
+
+ /**
+ * @brief Constructs a wrapper from a given value.
+ * @tparam Type Type of object to use to initialize the wrapper.
+ * @param area The context from which to search for meta types.
+ * @param value An instance of an object to use to initialize the wrapper.
+ */
+ template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, meta_any>>>
+ meta_any(const meta_ctx &area, Type &&value)
+ : meta_any{area, std::in_place_type<std::decay_t<Type>>, std::forward<Type>(value)} {}
+
+ /**
+ * @brief Context aware copy constructor.
+ * @param area The context from which to search for meta types.
+ * @param other The instance to copy from.
+ */
+ meta_any(const meta_ctx &area, const meta_any &other)
+ : storage{other.storage},
+ ctx{&area},
+ node{other.node.resolve ? other.node.resolve(internal::meta_context::from(*ctx)) : other.node},
+ vtable{other.vtable} {}
+
+ /**
+ * @brief Context aware move constructor.
+ * @param area The context from which to search for meta types.
+ * @param other The instance to move from.
+ */
+ meta_any(const meta_ctx &area, meta_any &&other)
+ : storage{std::move(other.storage)},
+ ctx{&area},
+ node{other.node.resolve ? std::exchange(other.node, internal::meta_type_node{}).resolve(internal::meta_context::from(*ctx)) : std::exchange(other.node, internal::meta_type_node{})},
+ vtable{std::exchange(other.vtable, &basic_vtable<void>)} {}
+
+ /**
+ * @brief Copy constructor.
+ * @param other The instance to copy from.
+ */
+ meta_any(const meta_any &other) = default;
+
+ /**
+ * @brief Move constructor.
+ * @param other The instance to move from.
+ */
+ meta_any(meta_any &&other) noexcept
+ : storage{std::move(other.storage)},
+ ctx{other.ctx},
+ node{std::exchange(other.node, internal::meta_type_node{})},
+ vtable{std::exchange(other.vtable, &basic_vtable<void>)} {}
+
+ /*! @brief Frees the internal storage, whatever it means. */
+ ~meta_any() noexcept {
+ release();
+ }
+
+ /**
+ * @brief Copy assignment operator.
+ * @param other The instance to copy from.
+ * @return This meta any object.
+ */
+ meta_any &operator=(const meta_any &other) {
+ if(this != &other) {
+ release();
+ storage = other.storage;
+ ctx = other.ctx;
+ node = other.node;
+ vtable = other.vtable;
+ }
+
+ return *this;
+ }
+
+ /**
+ * @brief Move assignment operator.
+ * @param other The instance to move from.
+ * @return This meta any object.
+ */
+ meta_any &operator=(meta_any &&other) noexcept {
+ ENTT_ASSERT(this != &other, "Self move assignment");
+
+ release();
+ storage = std::move(other.storage);
+ ctx = other.ctx;
+ node = std::exchange(other.node, internal::meta_type_node{});
+ vtable = std::exchange(other.vtable, &basic_vtable<void>);
+ return *this;
+ }
+
+ /**
+ * @brief Value assignment operator.
+ * @tparam Type Type of object to use to initialize the wrapper.
+ * @param value An instance of an object to use to initialize the wrapper.
+ * @return This meta any object.
+ */
+ template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, meta_any>>>
+ meta_any &operator=(Type &&value) {
+ emplace<std::decay_t<Type>>(std::forward<Type>(value));
+ return *this;
+ }
+
+ /*! @copydoc any::type */
+ [[nodiscard]] inline meta_type type() const noexcept;
+
+ /*! @copydoc any::data */
+ [[nodiscard]] const void *data() const noexcept {
+ return storage.data();
+ }
+
+ /*! @copydoc any::data */
+ [[nodiscard]] void *data() noexcept {
+ return storage.data();
+ }
+
+ /**
+ * @brief Invokes the underlying function, if possible.
+ * @tparam Args Types of arguments to use to invoke the function.
+ * @param id Unique identifier.
+ * @param args Parameters to use to invoke the function.
+ * @return A wrapper containing the returned value, if any.
+ */
+ template<typename... Args>
+ meta_any invoke(const id_type id, Args &&...args) const;
+
+ /*! @copydoc invoke */
+ template<typename... Args>
+ meta_any invoke(const id_type id, Args &&...args);
+
+ /**
+ * @brief Sets the value of a given variable.
+ * @tparam Type Type of value to assign.
+ * @param id Unique identifier.
+ * @param value Parameter to use to set the underlying variable.
+ * @return True in case of success, false otherwise.
+ */
+ template<typename Type>
+ bool set(const id_type id, Type &&value);
+
+ /**
+ * @brief Gets the value of a given variable.
+ * @param id Unique identifier.
+ * @return A wrapper containing the value of the underlying variable.
+ */
+ [[nodiscard]] meta_any get(const id_type id) const;
+
+ /*! @copydoc get */
+ [[nodiscard]] meta_any get(const id_type id);
+
+ /**
+ * @brief Tries to cast an instance to a given type.
+ * @tparam Type Type to which to cast the instance.
+ * @return A (possibly null) pointer to the contained instance.
+ */
+ template<typename Type>
+ [[nodiscard]] const Type *try_cast() const {
+ const auto other = internal::resolve<std::remove_cv_t<Type>>(internal::meta_context::from(*ctx));
+ return static_cast<const Type *>(internal::try_cast(internal::meta_context::from(*ctx), node, other, data()));
+ }
+
+ /*! @copydoc try_cast */
+ template<typename Type>
+ [[nodiscard]] Type *try_cast() {
+ if constexpr(std::is_const_v<Type>) {
+ return std::as_const(*this).try_cast<std::remove_const_t<Type>>();
+ } else {
+ const auto other = internal::resolve<std::remove_cv_t<Type>>(internal::meta_context::from(*ctx));
+ return static_cast<Type *>(const_cast<void *>(internal::try_cast(internal::meta_context::from(*ctx), node, other, data())));
+ }
+ }
+
+ /**
+ * @brief Tries to cast an instance to a given type.
+ * @tparam Type Type to which to cast the instance.
+ * @return A reference to the contained instance.
+ */
+ template<typename Type>
+ [[nodiscard]] Type cast() const {
+ auto *const instance = try_cast<std::remove_reference_t<Type>>();
+ ENTT_ASSERT(instance, "Invalid instance");
+ return static_cast<Type>(*instance);
+ }
+
+ /*! @copydoc cast */
+ template<typename Type>
+ [[nodiscard]] Type cast() {
+ // forces const on non-reference types to make them work also with wrappers for const references
+ auto *const instance = try_cast<std::remove_reference_t<const Type>>();
+ ENTT_ASSERT(instance, "Invalid instance");
+ return static_cast<Type>(*instance);
+ }
+
+ /**
+ * @brief Converts an object in such a way that a given cast becomes viable.
+ * @param type Meta type to which the cast is requested.
+ * @return A valid meta any object if there exists a viable conversion, an
+ * invalid one otherwise.
+ */
+ [[nodiscard]] meta_any allow_cast(const meta_type &type) const;
+
+ /**
+ * @brief Converts an object in such a way that a given cast becomes viable.
+ * @param type Meta type to which the cast is requested.
+ * @return True if there exists a viable conversion, false otherwise.
+ */
+ [[nodiscard]] bool allow_cast(const meta_type &type) {
+ if(auto other = std::as_const(*this).allow_cast(type); other) {
+ if((other.storage.policy() == any_policy::owner)) {
+ std::swap(*this, other);
+ }
+
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * @brief Converts an object in such a way that a given cast becomes viable.
+ * @tparam Type Type to which the cast is requested.
+ * @return A valid meta any object if there exists a viable conversion, an
+ * invalid one otherwise.
+ */
+ template<typename Type>
+ [[nodiscard]] meta_any allow_cast() const {
+ if constexpr(std::is_reference_v<Type> && !std::is_const_v<std::remove_reference_t<Type>>) {
+ return meta_any{meta_ctx_arg, *ctx};
+ } else {
+ auto other = internal::resolve<std::remove_cv_t<std::remove_reference_t<Type>>>(internal::meta_context::from(*ctx));
+ return allow_cast(meta_type{*ctx, other});
+ }
+ }
+
+ /**
+ * @brief Converts an object in such a way that a given cast becomes viable.
+ * @tparam Type Type to which the cast is requested.
+ * @return True if there exists a viable conversion, false otherwise.
+ */
+ template<typename Type>
+ [[nodiscard]] bool allow_cast() {
+ auto other = internal::resolve<std::remove_cv_t<std::remove_reference_t<Type>>>(internal::meta_context::from(*ctx));
+ return allow_cast(meta_type{*ctx, other}) && (!(std::is_reference_v<Type> && !std::is_const_v<std::remove_reference_t<Type>>) || storage.data() != nullptr);
+ }
+
+ /*! @copydoc any::emplace */
+ template<typename Type, typename... Args>
+ void emplace(Args &&...args) {
+ release();
+ storage.emplace<Type>(std::forward<Args>(args)...);
+ node = internal::resolve<std::remove_cv_t<std::remove_reference_t<Type>>>(internal::meta_context::from(*ctx));
+ vtable = &basic_vtable<std::remove_cv_t<std::remove_reference_t<Type>>>;
+ }
+
+ /*! @copydoc any::assign */
+ bool assign(const meta_any &other);
+
+ /*! @copydoc any::assign */
+ bool assign(meta_any &&other);
+
+ /*! @copydoc any::reset */
+ void reset() {
+ release();
+ storage.reset();
+ node = {};
+ vtable = &basic_vtable<void>;
+ }
+
+ /**
+ * @brief Returns a sequence container proxy.
+ * @return A sequence container proxy for the underlying object.
+ */
+ [[nodiscard]] meta_sequence_container as_sequence_container() noexcept {
+ meta_sequence_container proxy{*ctx};
+ vtable(internal::meta_traits::is_meta_sequence_container, policy() == meta_any_policy::cref, std::as_const(*this).data(), &proxy);
+ return proxy;
+ }
+
+ /*! @copydoc as_sequence_container */
+ [[nodiscard]] meta_sequence_container as_sequence_container() const noexcept {
+ meta_sequence_container proxy{*ctx};
+ vtable(internal::meta_traits::is_meta_sequence_container, true, data(), &proxy);
+ return proxy;
+ }
+
+ /**
+ * @brief Returns an associative container proxy.
+ * @return An associative container proxy for the underlying object.
+ */
+ [[nodiscard]] meta_associative_container as_associative_container() noexcept {
+ meta_associative_container proxy{*ctx};
+ vtable(internal::meta_traits::is_meta_associative_container, policy() == meta_any_policy::cref, std::as_const(*this).data(), &proxy);
+ return proxy;
+ }
+
+ /*! @copydoc as_associative_container */
+ [[nodiscard]] meta_associative_container as_associative_container() const noexcept {
+ meta_associative_container proxy{*ctx};
+ vtable(internal::meta_traits::is_meta_associative_container, true, data(), &proxy);
+ return proxy;
+ }
+
+ /**
+ * @brief Indirection operator for dereferencing opaque objects.
+ * @return A wrapper that shares a reference to an unmanaged object if the
+ * wrapped element is dereferenceable, an invalid meta any otherwise.
+ */
+ [[nodiscard]] meta_any operator*() const noexcept {
+ meta_any ret{meta_ctx_arg, *ctx};
+ vtable(internal::meta_traits::is_meta_pointer_like, true, storage.data(), &ret);
+ return ret;
+ }
+
+ /**
+ * @brief Returns false if a wrapper is invalid, true otherwise.
+ * @return False if the wrapper is invalid, true otherwise.
+ */
+ [[nodiscard]] explicit operator bool() const noexcept {
+ return !(node.info == nullptr);
+ }
+
+ /*! @copydoc any::operator== */
+ [[nodiscard]] bool operator==(const meta_any &other) const noexcept {
+ return (ctx == other.ctx) && ((!node.info && !other.node.info) || (node.info && other.node.info && *node.info == *other.node.info && storage == other.storage));
+ }
+
+ /*! @copydoc any::operator!= */
+ [[nodiscard]] bool operator!=(const meta_any &other) const noexcept {
+ return !(*this == other);
+ }
+
+ /*! @copydoc any::as_ref */
+ [[nodiscard]] meta_any as_ref() noexcept {
+ return meta_any{*this, storage.as_ref()};
+ }
+
+ /*! @copydoc any::as_ref */
+ [[nodiscard]] meta_any as_ref() const noexcept {
+ return meta_any{*this, storage.as_ref()};
+ }
+
+ /**
+ * @brief Returns the current mode of a meta any object.
+ * @return The current mode of the meta any object.
+ */
+ [[nodiscard]] meta_any_policy policy() const noexcept {
+ return storage.policy();
+ }
+
+private:
+ any storage{};
+ const meta_ctx *ctx{&locator<meta_ctx>::value_or()};
+ internal::meta_type_node node{};
+ vtable_type *vtable{&basic_vtable<void>};
+};
+
+/**
+ * @brief Forwards its argument and avoids copies for lvalue references.
+ * @tparam Type Type of argument to use to construct the new instance.
+ * @param value Parameter to use to construct the instance.
+ * @param ctx The context from which to search for meta types.
+ * @return A properly initialized and not necessarily owning wrapper.
+ */
+template<typename Type>
+[[nodiscard]] meta_any forward_as_meta(const meta_ctx &ctx, Type &&value) {
+ return meta_any{ctx, std::in_place_type<Type &&>, std::forward<Type>(value)};
+}
+
+/**
+ * @brief Forwards its argument and avoids copies for lvalue references.
+ * @tparam Type Type of argument to use to construct the new instance.
+ * @param value Parameter to use to construct the instance.
+ * @return A properly initialized and not necessarily owning wrapper.
+ */
+template<typename Type>
+[[nodiscard]] meta_any forward_as_meta(Type &&value) {
+ return forward_as_meta(locator<meta_ctx>::value_or(), std::forward<Type>(value));
+}
+
+/**
+ * @brief Opaque pointers to instances of any type.
+ *
+ * A handle doesn't perform copies and isn't responsible for the contained
+ * object. It doesn't prolong the lifetime of the pointed instance.
+ */
+struct meta_handle {
+ /*! Default constructor. */
+ meta_handle() = default;
+
+ /**
+ * @brief Context aware constructor.
+ * @param area The context from which to search for meta types.
+ */
+ meta_handle(meta_ctx_arg_t, const meta_ctx &area)
+ : any{meta_ctx_arg, area} {}
+
+ /**
+ * @brief Creates a handle that points to an unmanaged object.
+ * @param value An instance of an object to use to initialize the handle.
+ */
+ meta_handle(meta_any &value)
+ : any{value.as_ref()} {}
+
+ /**
+ * @brief Creates a handle that points to an unmanaged object.
+ * @param value An instance of an object to use to initialize the handle.
+ */
+ meta_handle(const meta_any &value)
+ : any{value.as_ref()} {}
+
+ /**
+ * @brief Creates a handle that points to an unmanaged object.
+ * @tparam Type Type of object to use to initialize the handle.
+ * @param ctx The context from which to search for meta types.
+ * @param value An instance of an object to use to initialize the handle.
+ */
+ template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, meta_handle>>>
+ meta_handle(const meta_ctx &ctx, Type &value)
+ : any{ctx, std::in_place_type<Type &>, value} {}
+
+ /**
+ * @brief Creates a handle that points to an unmanaged object.
+ * @tparam Type Type of object to use to initialize the handle.
+ * @param value An instance of an object to use to initialize the handle.
+ */
+ template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, meta_handle>>>
+ meta_handle(Type &value)
+ : meta_handle{locator<meta_ctx>::value_or(), value} {}
+
+ /**
+ * @brief Context aware copy constructor.
+ * @param area The context from which to search for meta types.
+ * @param other The instance to copy from.
+ */
+ meta_handle(const meta_ctx &area, const meta_handle &other)
+ : any{area, other.any} {}
+
+ /**
+ * @brief Context aware move constructor.
+ * @param area The context from which to search for meta types.
+ * @param other The instance to move from.
+ */
+ meta_handle(const meta_ctx &area, meta_handle &&other)
+ : any{area, std::move(other.any)} {}
+
+ /*! @brief Default copy constructor, deleted on purpose. */
+ meta_handle(const meta_handle &) = delete;
+
+ /*! @brief Default move constructor. */
+ meta_handle(meta_handle &&) = default;
+
+ /*! @brief Default destructor. */
+ ~meta_handle() noexcept = default;
+
+ /**
+ * @brief Default copy assignment operator, deleted on purpose.
+ * @return This meta handle.
+ */
+ meta_handle &operator=(const meta_handle &) = delete;
+
+ /**
+ * @brief Default move assignment operator.
+ * @return This meta handle.
+ */
+ meta_handle &operator=(meta_handle &&) = default;
+
+ /**
+ * @brief Returns false if a handle is invalid, true otherwise.
+ * @return False if the handle is invalid, true otherwise.
+ */
+ [[nodiscard]] explicit operator bool() const noexcept {
+ return static_cast<bool>(any);
+ }
+
+ /*! @copydoc meta_any::operator== */
+ [[nodiscard]] bool operator==(const meta_handle &other) const noexcept {
+ return (any == other.any);
+ }
+
+ /*! @copydoc meta_any::operator!= */
+ [[nodiscard]] bool operator!=(const meta_handle &other) const noexcept {
+ return !(*this == other);
+ }
+
+ /**
+ * @brief Access operator for accessing the contained opaque object.
+ * @return A wrapper that shares a reference to an unmanaged object.
+ */
+ [[nodiscard]] meta_any *operator->() {
+ return &any;
+ }
+
+ /*! @copydoc operator-> */
+ [[nodiscard]] const meta_any *operator->() const {
+ return &any;
+ }
+
+private:
+ meta_any any{meta_ctx_arg, locator<meta_ctx>::value_or()};
+};
+
+/*! @brief Opaque wrapper for properties of any type. */
+struct meta_prop {
+ /*! @brief Default constructor. */
+ meta_prop() noexcept = default;
+
+ /**
+ * @brief Context aware constructor for meta objects.
+ * @param area The context from which to search for meta types.
+ * @param curr The underlying node with which to construct the instance.
+ */
+ meta_prop(const meta_ctx &area, const internal::meta_prop_node &curr) noexcept
+ : node{&curr},
+ ctx{&area} {}
+
+ /**
+ * @brief Returns the stored value by const reference.
+ * @return A wrapper containing the value stored with the property.
+ */
+ [[nodiscard]] meta_any value() const {
+ return node->value ? node->type(internal::meta_context::from(*ctx)).from_void(*ctx, nullptr, node->value.get()) : meta_any{meta_ctx_arg, *ctx};
+ }
+
+ /**
+ * @brief Returns the stored value by reference.
+ * @return A wrapper containing the value stored with the property.
+ */
+ [[nodiscard]] meta_any value() {
+ return node->value ? node->type(internal::meta_context::from(*ctx)).from_void(*ctx, node->value.get(), nullptr) : meta_any{meta_ctx_arg, *ctx};
+ }
+
+ /**
+ * @brief Returns true if an object is valid, false otherwise.
+ * @return True if the object is valid, false otherwise.
+ */
+ [[nodiscard]] explicit operator bool() const noexcept {
+ return (node != nullptr);
+ }
+
+ /**
+ * @brief Checks if two objects refer to the same type.
+ * @param other The object with which to compare.
+ * @return True if the objects refer to the same type, false otherwise.
+ */
+ [[nodiscard]] bool operator==(const meta_prop &other) const noexcept {
+ return (ctx == other.ctx && node == other.node);
+ }
+
+private:
+ const internal::meta_prop_node *node{};
+ const meta_ctx *ctx{};
+};
+
+/**
+ * @brief Checks if two objects refer to the same type.
+ * @param lhs An object, either valid or not.
+ * @param rhs An object, either valid or not.
+ * @return False if the objects refer to the same node, true otherwise.
+ */
+[[nodiscard]] inline bool operator!=(const meta_prop &lhs, const meta_prop &rhs) noexcept {
+ return !(lhs == rhs);
+}
+
+/*! @brief Opaque wrapper for user defined data of any type. */
+struct meta_custom {
+ /*! @brief Default constructor. */
+ meta_custom() noexcept = default;
+
+ /**
+ * @brief Basic constructor for meta objects.
+ * @param curr The underlying node with which to construct the instance.
+ */
+ meta_custom(internal::meta_custom_node curr) noexcept
+ : node{std::move(curr)} {}
+
+ /**
+ * @brief Generic conversion operator.
+ * @tparam Type Type to which conversion is requested.
+ */
+ template<typename Type>
+ [[nodiscard]] operator Type *() const noexcept {
+ return (type_id<Type>().hash() == node.type) ? std::static_pointer_cast<Type>(node.value).get() : nullptr;
+ }
+
+ /**
+ * @brief Generic conversion operator.
+ * @tparam Type Type to which conversion is requested.
+ */
+ template<typename Type>
+ [[nodiscard]] operator Type &() const noexcept {
+ ENTT_ASSERT(type_id<Type>().hash() == node.type, "Invalid type");
+ return *std::static_pointer_cast<Type>(node.value);
+ }
+
+private:
+ internal::meta_custom_node node{};
+};
+
+/*! @brief Opaque wrapper for data members. */
+struct meta_data {
+ /*! @brief Unsigned integer type. */
+ using size_type = typename internal::meta_data_node::size_type;
+
+ /*! @brief Default constructor. */
+ meta_data() noexcept = default;
+
+ /**
+ * @brief Context aware constructor for meta objects.
+ * @param area The context from which to search for meta types.
+ * @param curr The underlying node with which to construct the instance.
+ */
+ meta_data(const meta_ctx &area, const internal::meta_data_node &curr) noexcept
+ : node{&curr},
+ ctx{&area} {}
+
+ /**
+ * @brief Returns the number of setters available.
+ * @return The number of setters available.
+ */
+ [[nodiscard]] size_type arity() const noexcept {
+ return node->arity;
+ }
+
+ /**
+ * @brief Indicates whether a data member is constant or not.
+ * @return True if the data member is constant, false otherwise.
+ */
+ [[nodiscard]] bool is_const() const noexcept {
+ return static_cast<bool>(node->traits & internal::meta_traits::is_const);
+ }
+
+ /**
+ * @brief Indicates whether a data member is static or not.
+ * @return True if the data member is static, false otherwise.
+ */
+ [[nodiscard]] bool is_static() const noexcept {
+ return static_cast<bool>(node->traits & internal::meta_traits::is_static);
+ }
+
+ /*! @copydoc meta_any::type */
+ [[nodiscard]] inline meta_type type() const noexcept;
+
+ /**
+ * @brief Sets the value of a given variable.
+ * @tparam Type Type of value to assign.
+ * @param instance An opaque instance of the underlying type.
+ * @param value Parameter to use to set the underlying variable.
+ * @return True in case of success, false otherwise.
+ */
+ template<typename Type>
+ // NOLINTNEXTLINE(modernize-use-nodiscard)
+ bool set(meta_handle instance, Type &&value) const {
+ return node->set && node->set(meta_handle{*ctx, std::move(instance)}, meta_any{*ctx, std::forward<Type>(value)});
+ }
+
+ /**
+ * @brief Gets the value of a given variable.
+ * @param instance An opaque instance of the underlying type.
+ * @return A wrapper containing the value of the underlying variable.
+ */
+ [[nodiscard]] meta_any get(meta_handle instance) const {
+ return node->get(*ctx, meta_handle{*ctx, std::move(instance)});
+ }
+
+ /**
+ * @brief Returns the type accepted by the i-th setter.
+ * @param index Index of the setter of which to return the accepted type.
+ * @return The type accepted by the i-th setter.
+ */
+ [[nodiscard]] inline meta_type arg(const size_type index) const noexcept;
+
+ /**
+ * @brief Returns a range to visit registered meta properties.
+ * @return An iterable range to visit registered meta properties.
+ */
+ [[nodiscard]] meta_range<meta_prop, typename decltype(internal::meta_data_node::prop)::const_iterator> prop() const noexcept {
+ return {{*ctx, node->prop.cbegin()}, {*ctx, node->prop.cend()}};
+ }
+
+ /**
+ * @brief Lookup utility for meta properties.
+ * @param key The key to use to search for a property.
+ * @return The registered meta property for the given key, if any.
+ */
+ [[nodiscard]] meta_prop prop(const id_type key) const {
+ const auto it = node->prop.find(key);
+ return it != node->prop.cend() ? meta_prop{*ctx, it->second} : meta_prop{};
+ }
+
+ /**
+ * @brief Returns all meta traits for a given meta object.
+ * @tparam Type The type to convert the meta traits to.
+ * @return The registered meta traits, if any.
+ */
+ template<typename Type>
+ [[nodiscard]] Type traits() const noexcept {
+ return internal::meta_to_user_traits<Type>(node->traits);
+ }
+
+ /**
+ * @brief Returns user defined data for a given meta object.
+ * @return User defined arbitrary data.
+ */
+ [[nodiscard]] meta_custom custom() const noexcept {
+ return {node->custom};
+ }
+
+ /**
+ * @brief Returns true if an object is valid, false otherwise.
+ * @return True if the object is valid, false otherwise.
+ */
+ [[nodiscard]] explicit operator bool() const noexcept {
+ return (node != nullptr);
+ }
+
+ /*! @copydoc meta_prop::operator== */
+ [[nodiscard]] bool operator==(const meta_data &other) const noexcept {
+ return (ctx == other.ctx && node == other.node);
+ }
+
+private:
+ const internal::meta_data_node *node{};
+ const meta_ctx *ctx{};
+};
+
+/**
+ * @brief Checks if two objects refer to the same type.
+ * @param lhs An object, either valid or not.
+ * @param rhs An object, either valid or not.
+ * @return False if the objects refer to the same node, true otherwise.
+ */
+[[nodiscard]] inline bool operator!=(const meta_data &lhs, const meta_data &rhs) noexcept {
+ return !(lhs == rhs);
+}
+
+/*! @brief Opaque wrapper for member functions. */
+struct meta_func {
+ /*! @brief Unsigned integer type. */
+ using size_type = typename internal::meta_func_node::size_type;
+
+ /*! @brief Default constructor. */
+ meta_func() noexcept = default;
+
+ /**
+ * @brief Context aware constructor for meta objects.
+ * @param area The context from which to search for meta types.
+ * @param curr The underlying node with which to construct the instance.
+ */
+ meta_func(const meta_ctx &area, const internal::meta_func_node &curr) noexcept
+ : node{&curr},
+ ctx{&area} {}
+
+ /**
+ * @brief Returns the number of arguments accepted by a member function.
+ * @return The number of arguments accepted by the member function.
+ */
+ [[nodiscard]] size_type arity() const noexcept {
+ return node->arity;
+ }
+
+ /**
+ * @brief Indicates whether a member function is constant or not.
+ * @return True if the member function is constant, false otherwise.
+ */
+ [[nodiscard]] bool is_const() const noexcept {
+ return static_cast<bool>(node->traits & internal::meta_traits::is_const);
+ }
+
+ /**
+ * @brief Indicates whether a member function is static or not.
+ * @return True if the member function is static, false otherwise.
+ */
+ [[nodiscard]] bool is_static() const noexcept {
+ return static_cast<bool>(node->traits & internal::meta_traits::is_static);
+ }
+
+ /**
+ * @brief Returns the return type of a member function.
+ * @return The return type of the member function.
+ */
+ [[nodiscard]] inline meta_type ret() const noexcept;
+
+ /**
+ * @brief Returns the type of the i-th argument of a member function.
+ * @param index Index of the argument of which to return the type.
+ * @return The type of the i-th argument of a member function.
+ */
+ [[nodiscard]] inline meta_type arg(const size_type index) const noexcept;
+
+ /**
+ * @brief Invokes the underlying function, if possible.
+ * @param instance An opaque instance of the underlying type.
+ * @param args Parameters to use to invoke the function.
+ * @param sz Number of parameters to use to invoke the function.
+ * @return A wrapper containing the returned value, if any.
+ */
+ meta_any invoke(meta_handle instance, meta_any *const args, const size_type sz) const {
+ return sz == arity() ? node->invoke(*ctx, meta_handle{*ctx, std::move(instance)}, args) : meta_any{meta_ctx_arg, *ctx};
+ }
+
+ /**
+ * @copybrief invoke
+ * @tparam Args Types of arguments to use to invoke the function.
+ * @param instance An opaque instance of the underlying type.
+ * @param args Parameters to use to invoke the function.
+ * @return A wrapper containing the returned value, if any.
+ */
+ template<typename... Args>
+ // NOLINTNEXTLINE(modernize-use-nodiscard)
+ meta_any invoke(meta_handle instance, Args &&...args) const {
+ std::array<meta_any, sizeof...(Args)> arguments{meta_any{*ctx, std::forward<Args>(args)}...};
+ return invoke(std::move(instance), arguments.data(), sizeof...(Args));
+ }
+
+ /*! @copydoc meta_data::prop */
+ [[nodiscard]] meta_range<meta_prop, typename decltype(internal::meta_func_node::prop)::const_iterator> prop() const noexcept {
+ return {{*ctx, node->prop.cbegin()}, {*ctx, node->prop.cend()}};
+ }
+
+ /**
+ * @brief Lookup utility for meta properties.
+ * @param key The key to use to search for a property.
+ * @return The registered meta property for the given key, if any.
+ */
+ [[nodiscard]] meta_prop prop(const id_type key) const {
+ const auto it = node->prop.find(key);
+ return it != node->prop.cend() ? meta_prop{*ctx, it->second} : meta_prop{};
+ }
+
+ /*! @copydoc meta_data::traits */
+ template<typename Type>
+ [[nodiscard]] Type traits() const noexcept {
+ return internal::meta_to_user_traits<Type>(node->traits);
+ }
+
+ /*! @copydoc meta_data::custom */
+ [[nodiscard]] meta_custom custom() const noexcept {
+ return {node->custom};
+ }
+
+ /**
+ * @brief Returns the next overload of a given function, if any.
+ * @return The next overload of the given function, if any.
+ */
+ [[nodiscard]] meta_func next() const {
+ return node->next ? meta_func{*ctx, *node->next} : meta_func{};
+ }
+
+ /**
+ * @brief Returns true if an object is valid, false otherwise.
+ * @return True if the object is valid, false otherwise.
+ */
+ [[nodiscard]] explicit operator bool() const noexcept {
+ return (node != nullptr);
+ }
+
+ /*! @copydoc meta_prop::operator== */
+ [[nodiscard]] bool operator==(const meta_func &other) const noexcept {
+ return (ctx == other.ctx && node == other.node);
+ }
+
+private:
+ const internal::meta_func_node *node{};
+ const meta_ctx *ctx{};
+};
+
+/**
+ * @brief Checks if two objects refer to the same type.
+ * @param lhs An object, either valid or not.
+ * @param rhs An object, either valid or not.
+ * @return False if the objects refer to the same node, true otherwise.
+ */
+[[nodiscard]] inline bool operator!=(const meta_func &lhs, const meta_func &rhs) noexcept {
+ return !(lhs == rhs);
+}
+
+/*! @brief Opaque wrapper for types. */
+class meta_type {
+ template<typename Func>
+ [[nodiscard]] auto lookup(meta_any *const args, const typename internal::meta_type_node::size_type sz, [[maybe_unused]] bool constness, Func next) const {
+ decltype(next()) candidate = nullptr;
+ size_type same{};
+ bool ambiguous{};
+
+ for(auto curr = next(); curr; curr = next()) {
+ if constexpr(std::is_same_v<std::decay_t<decltype(*curr)>, internal::meta_func_node>) {
+ if(constness && !static_cast<bool>(curr->traits & internal::meta_traits::is_const)) {
+ continue;
+ }
+ }
+
+ if(curr->arity == sz) {
+ size_type match{};
+ size_type pos{};
+
+ // NOLINTBEGIN(cppcoreguidelines-pro-bounds-pointer-arithmetic) - waiting for C++20 (and std::span)
+ for(; pos < sz && args[pos]; ++pos) {
+ const auto other = curr->arg(*ctx, pos);
+ const auto type = args[pos].type();
+
+ if(const auto &info = other.info(); info == type.info()) {
+ ++match;
+ } else if(!((type.node.details && (type.node.details->base.contains(info.hash()) || type.node.details->conv.contains(info.hash()))) || (type.node.conversion_helper && other.node.conversion_helper))) {
+ break;
+ }
+ }
+ // NOLINTEND(cppcoreguidelines-pro-bounds-pointer-arithmetic)
+
+ if(pos == sz) {
+ if(!candidate || match > same) {
+ candidate = curr;
+ same = match;
+ ambiguous = false;
+ } else if(match == same) {
+ if constexpr(std::is_same_v<std::decay_t<decltype(*curr)>, internal::meta_func_node>) {
+ if(static_cast<bool>(curr->traits & internal::meta_traits::is_const) != static_cast<bool>(candidate->traits & internal::meta_traits::is_const)) {
+ candidate = static_cast<bool>(candidate->traits & internal::meta_traits::is_const) ? curr : candidate;
+ ambiguous = false;
+ continue;
+ }
+ }
+
+ ambiguous = true;
+ }
+ }
+ }
+ }
+
+ return ambiguous ? nullptr : candidate;
+ }
+
+public:
+ /*! @brief Unsigned integer type. */
+ using size_type = typename internal::meta_type_node::size_type;
+
+ /*! @brief Default constructor. */
+ meta_type() noexcept = default;
+
+ /**
+ * @brief Context aware constructor for meta objects.
+ * @param area The context from which to search for meta types.
+ * @param curr The underlying node with which to construct the instance.
+ */
+ meta_type(const meta_ctx &area, internal::meta_type_node curr) noexcept
+ : node{std::move(curr)},
+ ctx{&area} {}
+
+ /**
+ * @brief Context aware constructor for meta objects.
+ * @param area The context from which to search for meta types.
+ * @param curr The underlying node with which to construct the instance.
+ */
+ meta_type(const meta_ctx &area, const internal::meta_base_node &curr) noexcept
+ : meta_type{area, curr.type(internal::meta_context::from(area))} {}
+
+ /**
+ * @brief Returns the type info object of the underlying type.
+ * @return The type info object of the underlying type.
+ */
+ [[nodiscard]] const type_info &info() const noexcept {
+ return *node.info;
+ }
+
+ /**
+ * @brief Returns the identifier assigned to a type.
+ * @return The identifier assigned to the type.
+ */
+ [[nodiscard]] id_type id() const noexcept {
+ return node.id;
+ }
+
+ /**
+ * @brief Returns the size of the underlying type if known.
+ * @return The size of the underlying type if known, 0 otherwise.
+ */
+ [[nodiscard]] size_type size_of() const noexcept {
+ return node.size_of;
+ }
+
+ /**
+ * @brief Checks whether a type refers to an arithmetic type or not.
+ * @return True if the underlying type is an arithmetic type, false
+ * otherwise.
+ */
+ [[nodiscard]] bool is_arithmetic() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_arithmetic);
+ }
+
+ /**
+ * @brief Checks whether a type refers to an integral type or not.
+ * @return True if the underlying type is an integral type, false otherwise.
+ */
+ [[nodiscard]] bool is_integral() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_integral);
+ }
+
+ /**
+ * @brief Checks whether a type refers to a signed type or not.
+ * @return True if the underlying type is a signed type, false otherwise.
+ */
+ [[nodiscard]] bool is_signed() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_signed);
+ }
+
+ /**
+ * @brief Checks whether a type refers to an array type or not.
+ * @return True if the underlying type is an array type, false otherwise.
+ */
+ [[nodiscard]] bool is_array() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_array);
+ }
+
+ /**
+ * @brief Checks whether a type refers to an enum or not.
+ * @return True if the underlying type is an enum, false otherwise.
+ */
+ [[nodiscard]] bool is_enum() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_enum);
+ }
+
+ /**
+ * @brief Checks whether a type refers to a class or not.
+ * @return True if the underlying type is a class, false otherwise.
+ */
+ [[nodiscard]] bool is_class() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_class);
+ }
+
+ /**
+ * @brief Checks whether a type refers to a pointer or not.
+ * @return True if the underlying type is a pointer, false otherwise.
+ */
+ [[nodiscard]] bool is_pointer() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_pointer);
+ }
+
+ /**
+ * @brief Provides the type for which the pointer is defined.
+ * @return The type for which the pointer is defined or this type if it
+ * doesn't refer to a pointer type.
+ */
+ [[nodiscard]] meta_type remove_pointer() const noexcept {
+ return {*ctx, node.remove_pointer(internal::meta_context::from(*ctx))};
+ }
+
+ /**
+ * @brief Checks whether a type is a pointer-like type or not.
+ * @return True if the underlying type is pointer-like, false otherwise.
+ */
+ [[nodiscard]] bool is_pointer_like() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_meta_pointer_like);
+ }
+
+ /**
+ * @brief Checks whether a type refers to a sequence container or not.
+ * @return True if the type is a sequence container, false otherwise.
+ */
+ [[nodiscard]] bool is_sequence_container() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_meta_sequence_container);
+ }
+
+ /**
+ * @brief Checks whether a type refers to an associative container or not.
+ * @return True if the type is an associative container, false otherwise.
+ */
+ [[nodiscard]] bool is_associative_container() const noexcept {
+ return static_cast<bool>(node.traits & internal::meta_traits::is_meta_associative_container);
+ }
+
+ /**
+ * @brief Checks whether a type refers to a recognized class template
+ * specialization or not.
+ * @return True if the type is a recognized class template specialization,
+ * false otherwise.
+ */
+ [[nodiscard]] bool is_template_specialization() const noexcept {
+ return (node.templ.arity != 0u);
+ }
+
+ /**
+ * @brief Returns the number of template arguments.
+ * @return The number of template arguments.
+ */
+ [[nodiscard]] size_type template_arity() const noexcept {
+ return node.templ.arity;
+ }
+
+ /**
+ * @brief Returns a tag for the class template of the underlying type.
+ * @return The tag for the class template of the underlying type.
+ */
+ [[nodiscard]] inline meta_type template_type() const noexcept {
+ return node.templ.type ? meta_type{*ctx, node.templ.type(internal::meta_context::from(*ctx))} : meta_type{};
+ }
+
+ /**
+ * @brief Returns the type of the i-th template argument of a type.
+ * @param index Index of the template argument of which to return the type.
+ * @return The type of the i-th template argument of a type.
+ */
+ [[nodiscard]] inline meta_type template_arg(const size_type index) const noexcept {
+ return index < template_arity() ? meta_type{*ctx, node.templ.arg(internal::meta_context::from(*ctx), index)} : meta_type{};
+ }
+
+ /**
+ * @brief Checks if a type supports direct casting to another type.
+ * @param other The meta type to test for.
+ * @return True if direct casting is allowed, false otherwise.
+ */
+ [[nodiscard]] bool can_cast(const meta_type &other) const noexcept {
+ // casting this is UB in all cases but we aren't going to use the resulting pointer, so...
+ return (internal::try_cast(internal::meta_context::from(*ctx), node, other.node, this) != nullptr);
+ }
+
+ /**
+ * @brief Checks if a type supports conversion it to another type.
+ * @param other The meta type to test for.
+ * @return True if the conversion is allowed, false otherwise.
+ */
+ [[nodiscard]] bool can_convert(const meta_type &other) const noexcept {
+ return (internal::try_convert(internal::meta_context::from(*ctx), node, other.info(), other.is_arithmetic() || other.is_enum(), nullptr, [](const void *, auto &&...args) { return ((static_cast<void>(args), 1) + ... + 0u); }) != 0u);
+ }
+
+ /**
+ * @brief Returns a range to visit registered top-level base meta types.
+ * @return An iterable range to visit registered top-level base meta types.
+ */
+ [[nodiscard]] meta_range<meta_type, typename decltype(internal::meta_type_descriptor::base)::const_iterator> base() const noexcept {
+ using range_type = meta_range<meta_type, typename decltype(internal::meta_type_descriptor::base)::const_iterator>;
+ return node.details ? range_type{{*ctx, node.details->base.cbegin()}, {*ctx, node.details->base.cend()}} : range_type{};
+ }
+
+ /**
+ * @brief Returns a range to visit registered top-level meta data.
+ * @return An iterable range to visit registered top-level meta data.
+ */
+ [[nodiscard]] meta_range<meta_data, typename decltype(internal::meta_type_descriptor::data)::const_iterator> data() const noexcept {
+ using range_type = meta_range<meta_data, typename decltype(internal::meta_type_descriptor::data)::const_iterator>;
+ return node.details ? range_type{{*ctx, node.details->data.cbegin()}, {*ctx, node.details->data.cend()}} : range_type{};
+ }
+
+ /**
+ * @brief Lookup utility for meta data (bases are also visited).
+ * @param id Unique identifier.
+ * @return The registered meta data for the given identifier, if any.
+ */
+ [[nodiscard]] meta_data data(const id_type id) const {
+ const auto *elem = internal::look_for<&internal::meta_type_descriptor::data>(internal::meta_context::from(*ctx), node, id);
+ return elem ? meta_data{*ctx, *elem} : meta_data{};
+ }
+
+ /**
+ * @brief Returns a range to visit registered top-level functions.
+ * @return An iterable range to visit registered top-level functions.
+ */
+ [[nodiscard]] meta_range<meta_func, typename decltype(internal::meta_type_descriptor::func)::const_iterator> func() const noexcept {
+ using return_type = meta_range<meta_func, typename decltype(internal::meta_type_descriptor::func)::const_iterator>;
+ return node.details ? return_type{{*ctx, node.details->func.cbegin()}, {*ctx, node.details->func.cend()}} : return_type{};
+ }
+
+ /**
+ * @brief Lookup utility for meta functions (bases are also visited).
+ *
+ * In case of overloaded functions, a random one is returned.
+ *
+ * @param id Unique identifier.
+ * @return The registered meta function for the given identifier, if any.
+ */
+ [[nodiscard]] meta_func func(const id_type id) const {
+ const auto *elem = internal::look_for<&internal::meta_type_descriptor::func>(internal::meta_context::from(*ctx), node, id);
+ return elem ? meta_func{*ctx, *elem} : meta_func{};
+ }
+
+ /**
+ * @brief Creates an instance of the underlying type, if possible.
+ * @param args Parameters to use to construct the instance.
+ * @param sz Number of parameters to use to construct the instance.
+ * @return A wrapper containing the new instance, if any.
+ */
+ [[nodiscard]] meta_any construct(meta_any *const args, const size_type sz) const {
+ if(node.details) {
+ if(const auto *candidate = lookup(args, sz, false, [first = node.details->ctor.cbegin(), last = node.details->ctor.cend()]() mutable { return first == last ? nullptr : &(first++)->second; }); candidate) {
+ return candidate->invoke(*ctx, args);
+ }
+ }
+
+ if(sz == 0u && node.default_constructor) {
+ return node.default_constructor(*ctx);
+ }
+
+ return meta_any{meta_ctx_arg, *ctx};
+ }
+
+ /**
+ * @copybrief construct
+ * @tparam Args Types of arguments to use to construct the instance.
+ * @param args Parameters to use to construct the instance.
+ * @return A wrapper containing the new instance, if any.
+ */
+ template<typename... Args>
+ [[nodiscard]] meta_any construct(Args &&...args) const {
+ std::array<meta_any, sizeof...(Args)> arguments{meta_any{*ctx, std::forward<Args>(args)}...};
+ return construct(arguments.data(), sizeof...(Args));
+ }
+
+ /**
+ * @brief Wraps an opaque element of the underlying type.
+ * @param elem A valid pointer to an element of the underlying type.
+ * @return A wrapper that references the given instance.
+ */
+ [[nodiscard]] meta_any from_void(void *elem) const {
+ return (elem && node.from_void) ? node.from_void(*ctx, elem, nullptr) : meta_any{meta_ctx_arg, *ctx};
+ }
+
+ /*! @copydoc from_void */
+ [[nodiscard]] meta_any from_void(const void *elem) const {
+ return (elem && node.from_void) ? node.from_void(*ctx, nullptr, elem) : meta_any{meta_ctx_arg, *ctx};
+ }
+
+ /**
+ * @brief Invokes a function given an identifier, if possible.
+ * @param id Unique identifier.
+ * @param instance An opaque instance of the underlying type.
+ * @param args Parameters to use to invoke the function.
+ * @param sz Number of parameters to use to invoke the function.
+ * @return A wrapper containing the returned value, if any.
+ */
+ meta_any invoke(const id_type id, meta_handle instance, meta_any *const args, const size_type sz) const {
+ if(node.details) {
+ if(auto it = node.details->func.find(id); it != node.details->func.cend()) {
+ if(const auto *candidate = lookup(args, sz, instance && (instance->data() == nullptr), [curr = &it->second]() mutable { return curr ? std::exchange(curr, curr->next.get()) : nullptr; }); candidate) {
+ return candidate->invoke(*ctx, meta_handle{*ctx, std::move(instance)}, args);
+ }
+ }
+ }
+
+ for(auto &&curr: base()) {
+ if(auto elem = curr.second.invoke(id, *instance.operator->(), args, sz); elem) {
+ return elem;
+ }
+ }
+
+ return meta_any{meta_ctx_arg, *ctx};
+ }
+
+ /**
+ * @copybrief invoke
+ * @param id Unique identifier.
+ * @tparam Args Types of arguments to use to invoke the function.
+ * @param instance An opaque instance of the underlying type.
+ * @param args Parameters to use to invoke the function.
+ * @return A wrapper containing the returned value, if any.
+ */
+ template<typename... Args>
+ // NOLINTNEXTLINE(modernize-use-nodiscard)
+ meta_any invoke(const id_type id, meta_handle instance, Args &&...args) const {
+ std::array<meta_any, sizeof...(Args)> arguments{meta_any{*ctx, std::forward<Args>(args)}...};
+ return invoke(id, std::move(instance), arguments.data(), sizeof...(Args));
+ }
+
+ /**
+ * @brief Sets the value of a given variable.
+ * @tparam Type Type of value to assign.
+ * @param id Unique identifier.
+ * @param instance An opaque instance of the underlying type.
+ * @param value Parameter to use to set the underlying variable.
+ * @return True in case of success, false otherwise.
+ */
+ template<typename Type>
+ bool set(const id_type id, meta_handle instance, Type &&value) const {
+ const auto candidate = data(id);
+ return candidate && candidate.set(std::move(instance), std::forward<Type>(value));
+ }
+
+ /**
+ * @brief Gets the value of a given variable.
+ * @param id Unique identifier.
+ * @param instance An opaque instance of the underlying type.
+ * @return A wrapper containing the value of the underlying variable.
+ */
+ [[nodiscard]] meta_any get(const id_type id, meta_handle instance) const {
+ const auto candidate = data(id);
+ return candidate ? candidate.get(std::move(instance)) : meta_any{meta_ctx_arg, *ctx};
+ }
+
+ /**
+ * @brief Returns a range to visit registered top-level meta properties.
+ * @return An iterable range to visit registered top-level meta properties.
+ */
+ [[nodiscard]] meta_range<meta_prop, typename decltype(internal::meta_type_descriptor::prop)::const_iterator> prop() const noexcept {
+ using range_type = meta_range<meta_prop, typename decltype(internal::meta_type_descriptor::prop)::const_iterator>;
+ return node.details ? range_type{{*ctx, node.details->prop.cbegin()}, {*ctx, node.details->prop.cend()}} : range_type{};
+ }
+
+ /**
+ * @brief Lookup utility for meta properties (bases are also visited).
+ * @param key The key to use to search for a property.
+ * @return The registered meta property for the given key, if any.
+ */
+ [[nodiscard]] meta_prop prop(const id_type key) const {
+ const auto *elem = internal::look_for<&internal::meta_type_descriptor::prop>(internal::meta_context::from(*ctx), node, key);
+ return elem ? meta_prop{*ctx, *elem} : meta_prop{};
+ }
+
+ /*! @copydoc meta_data::traits */
+ template<typename Type>
+ [[nodiscard]] Type traits() const noexcept {
+ return internal::meta_to_user_traits<Type>(node.traits);
+ }
+
+ /*! @copydoc meta_data::custom */
+ [[nodiscard]] meta_custom custom() const noexcept {
+ return {node.custom};
+ }
+
+ /**
+ * @brief Returns true if an object is valid, false otherwise.
+ * @return True if the object is valid, false otherwise.
+ */
+ [[nodiscard]] explicit operator bool() const noexcept {
+ return !(ctx == nullptr);
+ }
+
+ /*! @copydoc meta_prop::operator== */
+ [[nodiscard]] bool operator==(const meta_type &other) const noexcept {
+ return (ctx == other.ctx) && ((!node.info && !other.node.info) || (node.info && other.node.info && *node.info == *other.node.info));
+ }
+
+private:
+ internal::meta_type_node node{};
+ const meta_ctx *ctx{};
+};
+
+/**
+ * @brief Checks if two objects refer to the same type.
+ * @param lhs An object, either valid or not.
+ * @param rhs An object, either valid or not.
+ * @return False if the objects refer to the same node, true otherwise.
+ */
+[[nodiscard]] inline bool operator!=(const meta_type &lhs, const meta_type &rhs) noexcept {
+ return !(lhs == rhs);
+}
+
+[[nodiscard]] inline meta_type meta_any::type() const noexcept {
+ return node.info ? meta_type{*ctx, node} : meta_type{};
+}
+
+template<typename... Args>
+// NOLINTNEXTLINE(modernize-use-nodiscard)
+meta_any meta_any::invoke(const id_type id, Args &&...args) const {
+ return type().invoke(id, *this, std::forward<Args>(args)...);
+}
+
+template<typename... Args>
+meta_any meta_any::invoke(const id_type id, Args &&...args) {
+ return type().invoke(id, *this, std::forward<Args>(args)...);
+}
+
+template<typename Type>
+bool meta_any::set(const id_type id, Type &&value) {
+ return type().set(id, *this, std::forward<Type>(value));
+}
+
+[[nodiscard]] inline meta_any meta_any::get(const id_type id) const {
+ return type().get(id, *this);
+}
+
+[[nodiscard]] inline meta_any meta_any::get(const id_type id) {
+ return type().get(id, *this);
+}
+
+[[nodiscard]] inline meta_any meta_any::allow_cast(const meta_type &type) const {
+ return internal::try_convert(internal::meta_context::from(*ctx), node, type.info(), type.is_arithmetic() || type.is_enum(), data(), [this, &type]([[maybe_unused]] const void *instance, auto &&...args) {
+ if constexpr((std::is_same_v<std::remove_const_t<std::remove_reference_t<decltype(args)>>, internal::meta_type_node> || ...)) {
+ return (args.from_void(*ctx, nullptr, instance), ...);
+ } else if constexpr((std::is_same_v<std::remove_const_t<std::remove_reference_t<decltype(args)>>, internal::meta_conv_node> || ...)) {
+ return (args.conv(*ctx, instance), ...);
+ } else if constexpr((std::is_same_v<std::remove_const_t<std::remove_reference_t<decltype(args)>>, decltype(internal::meta_type_node::conversion_helper)> || ...)) {
+ // exploits the fact that arithmetic types and enums are also default constructible
+ auto other = type.construct();
+ const auto value = (args(nullptr, instance), ...);
+ other.node.conversion_helper(other.data(), &value);
+ return other;
+ } else {
+ // forwards to force a compile-time error in case of available arguments
+ return meta_any{meta_ctx_arg, *ctx, std::forward<decltype(args)>(args)...};
+ }
+ });
+}
+
+inline bool meta_any::assign(const meta_any &other) {
+ auto value = other.allow_cast({*ctx, node});
+ return value && storage.assign(value.storage);
+}
+
+inline bool meta_any::assign(meta_any &&other) {
+ if(*node.info == *other.node.info) {
+ return storage.assign(std::move(other.storage));
+ }
+
+ return assign(std::as_const(other));
+}
+
+[[nodiscard]] inline meta_type meta_data::type() const noexcept {
+ return meta_type{*ctx, node->type(internal::meta_context::from(*ctx))};
+}
+
+[[nodiscard]] inline meta_type meta_data::arg(const size_type index) const noexcept {
+ return index < arity() ? node->arg(*ctx, index) : meta_type{};
+}
+
+[[nodiscard]] inline meta_type meta_func::ret() const noexcept {
+ return meta_type{*ctx, node->ret(internal::meta_context::from(*ctx))};
+}
+
+[[nodiscard]] inline meta_type meta_func::arg(const size_type index) const noexcept {
+ return index < arity() ? node->arg(*ctx, index) : meta_type{};
+}
+
+/*! @cond TURN_OFF_DOXYGEN */
+class meta_sequence_container::meta_iterator final {
+ using vtable_type = void(const void *, const std::ptrdiff_t, meta_any *);
+
+ template<typename It>
+ static void basic_vtable(const void *value, const std::ptrdiff_t offset, meta_any *other) {
+ const auto &it = *static_cast<const It *>(value);
+ other ? other->emplace<decltype(*it)>(*it) : std::advance(const_cast<It &>(it), offset);
+ }
+
+public:
+ using value_type = meta_any;
+ using pointer = input_iterator_pointer<value_type>;
+ using reference = value_type;
+ using difference_type = std::ptrdiff_t;
+ using iterator_category = std::input_iterator_tag;
+ using iterator_concept = std::bidirectional_iterator_tag;
+
+ meta_iterator() = default;
+
+ template<typename It>
+ meta_iterator(const meta_ctx &area, It iter) noexcept
+ : ctx{&area},
+ vtable{&basic_vtable<It>},
+ handle{iter} {}
+
+ meta_iterator &operator++() noexcept {
+ vtable(handle.data(), 1, nullptr);
+ return *this;
+ }
+
+ meta_iterator operator++(int value) noexcept {
+ meta_iterator orig = *this;
+ vtable(handle.data(), ++value, nullptr);
+ return orig;
+ }
+
+ meta_iterator &operator--() noexcept {
+ vtable(handle.data(), -1, nullptr);
+ return *this;
+ }
+
+ meta_iterator operator--(int value) noexcept {
+ meta_iterator orig = *this;
+ vtable(handle.data(), --value, nullptr);
+ return orig;
+ }
+
+ [[nodiscard]] reference operator*() const {
+ reference other{meta_ctx_arg, *ctx};
+ vtable(handle.data(), 0, &other);
+ return other;
+ }
+
+ [[nodiscard]] pointer operator->() const {
+ return operator*();
+ }
+
+ [[nodiscard]] explicit operator bool() const noexcept {
+ return static_cast<bool>(handle);
+ }
+
+ [[nodiscard]] bool operator==(const meta_iterator &other) const noexcept {
+ return handle == other.handle;
+ }
+
+ [[nodiscard]] bool operator!=(const meta_iterator &other) const noexcept {
+ return !(*this == other);
+ }
+
+ [[nodiscard]] const any &base() const noexcept {
+ return handle;
+ }
+
+private:
+ const meta_ctx *ctx{&locator<meta_ctx>::value_or()};
+ vtable_type *vtable{};
+ any handle{};
+};
+
+class meta_associative_container::meta_iterator final {
+ using vtable_type = void(const void *, std::pair<meta_any, meta_any> *);
+
+ template<bool KeyOnly, typename It>
+ static void basic_vtable(const void *value, std::pair<meta_any, meta_any> *other) {
+ if(const auto &it = *static_cast<const It *>(value); other) {
+ if constexpr(KeyOnly) {
+ other->first.emplace<decltype(*it)>(*it);
+ } else {
+ other->first.emplace<decltype((it->first))>(it->first);
+ other->second.emplace<decltype((it->second))>(it->second);
+ }
+ } else {
+ ++const_cast<It &>(it);
+ }
+ }
+
+public:
+ using value_type = std::pair<meta_any, meta_any>;
+ using pointer = input_iterator_pointer<value_type>;
+ using reference = value_type;
+ using difference_type = std::ptrdiff_t;
+ using iterator_category = std::input_iterator_tag;
+ using iterator_concept = std::forward_iterator_tag;
+
+ meta_iterator() = default;
+
+ template<bool KeyOnly, typename It>
+ meta_iterator(const meta_ctx &area, std::bool_constant<KeyOnly>, It iter) noexcept
+ : ctx{&area},
+ vtable{&basic_vtable<KeyOnly, It>},
+ handle{iter} {}
+
+ meta_iterator &operator++() noexcept {
+ vtable(handle.data(), nullptr);
+ return *this;
+ }
+
+ meta_iterator operator++(int) noexcept {
+ meta_iterator orig = *this;
+ vtable(handle.data(), nullptr);
+ return orig;
+ }
+
+ [[nodiscard]] reference operator*() const {
+ reference other{{meta_ctx_arg, *ctx}, {meta_ctx_arg, *ctx}};
+ vtable(handle.data(), &other);
+ return other;
+ }
+
+ [[nodiscard]] pointer operator->() const {
+ return operator*();
+ }
+
+ [[nodiscard]] explicit operator bool() const noexcept {
+ return static_cast<bool>(handle);
+ }
+
+ [[nodiscard]] bool operator==(const meta_iterator &other) const noexcept {
+ return handle == other.handle;
+ }
+
+ [[nodiscard]] bool operator!=(const meta_iterator &other) const noexcept {
+ return !(*this == other);
+ }
+
+private:
+ const meta_ctx *ctx{&locator<meta_ctx>::value_or()};
+ vtable_type *vtable{};
+ any handle{};
+};
+/*! @endcond */
+
+/**
+ * @brief Returns the meta value type of a container.
+ * @return The meta value type of the container.
+ */
+[[nodiscard]] inline meta_type meta_sequence_container::value_type() const noexcept {
+ return value_type_node ? meta_type{*ctx, value_type_node(internal::meta_context::from(*ctx))} : meta_type{};
+}
+
+/**
+ * @brief Returns the size of a container.
+ * @return The size of the container.
+ */
+[[nodiscard]] inline meta_sequence_container::size_type meta_sequence_container::size() const noexcept {
+ return size_fn(data);
+}
+
+/**
+ * @brief Resizes a container to contain a given number of elements.
+ * @param sz The new size of the container.
+ * @return True in case of success, false otherwise.
+ */
+inline bool meta_sequence_container::resize(const size_type sz) {
+ return !const_only && resize_fn(const_cast<void *>(data), sz);
+}
+
+/**
+ * @brief Clears the content of a container.
+ * @return True in case of success, false otherwise.
+ */
+inline bool meta_sequence_container::clear() {
+ return !const_only && clear_fn(const_cast<void *>(data));
+}
+
+/**
+ * @brief Reserves storage for at least the given number of elements.
+ * @param sz The new capacity of the container.
+ * @return True in case of success, false otherwise.
+ */
+inline bool meta_sequence_container::reserve(const size_type sz) {
+ return !const_only && reserve_fn(const_cast<void *>(data), sz);
+}
+
+/**
+ * @brief Returns an iterator to the first element of a container.
+ * @return An iterator to the first element of the container.
+ */
+[[nodiscard]] inline meta_sequence_container::iterator meta_sequence_container::begin() {
+ return begin_fn(*ctx, const_only ? nullptr : const_cast<void *>(data), data);
+}
+
+/**
+ * @brief Returns an iterator that is past the last element of a container.
+ * @return An iterator that is past the last element of the container.
+ */
+[[nodiscard]] inline meta_sequence_container::iterator meta_sequence_container::end() {
+ return end_fn(*ctx, const_only ? nullptr : const_cast<void *>(data), data);
+}
+
+/**
+ * @brief Inserts an element at a specified location of a container.
+ * @param it Iterator before which the element will be inserted.
+ * @param value Element value to insert.
+ * @return A possibly invalid iterator to the inserted element.
+ */
+inline meta_sequence_container::iterator meta_sequence_container::insert(const iterator &it, meta_any value) {
+ // this abomination is necessary because only on macos value_type and const_reference are different types for std::vector<bool>
+ if(const auto vtype = value_type_node(internal::meta_context::from(*ctx)); !const_only && (value.allow_cast({*ctx, vtype}) || value.allow_cast({*ctx, const_reference_node(internal::meta_context::from(*ctx))}))) {
+ const bool is_value_type = (value.type().info() == *vtype.info);
+ return insert_fn(*ctx, const_cast<void *>(data), is_value_type ? std::as_const(value).data() : nullptr, is_value_type ? nullptr : std::as_const(value).data(), it);
+ }
+
+ return iterator{};
+}
+
+/**
+ * @brief Removes a given element from a container.
+ * @param it Iterator to the element to remove.
+ * @return A possibly invalid iterator following the last removed element.
+ */
+inline meta_sequence_container::iterator meta_sequence_container::erase(const iterator &it) {
+ return const_only ? iterator{} : erase_fn(*ctx, const_cast<void *>(data), it);
+}
+
+/**
+ * @brief Returns a reference to the element at a given location of a container.
+ * @param pos The position of the element to return.
+ * @return A reference to the requested element properly wrapped.
+ */
+[[nodiscard]] inline meta_any meta_sequence_container::operator[](const size_type pos) {
+ auto it = begin();
+ it.operator++(static_cast<int>(pos) - 1);
+ return *it;
+}
+
+/**
+ * @brief Returns false if a proxy is invalid, true otherwise.
+ * @return False if the proxy is invalid, true otherwise.
+ */
+[[nodiscard]] inline meta_sequence_container::operator bool() const noexcept {
+ return (data != nullptr);
+}
+
+/**
+ * @brief Returns the meta key type of a container.
+ * @return The meta key type of the a container.
+ */
+[[nodiscard]] inline meta_type meta_associative_container::key_type() const noexcept {
+ return key_type_node ? meta_type{*ctx, key_type_node(internal::meta_context::from(*ctx))} : meta_type{};
+}
+
+/**
+ * @brief Returns the meta mapped type of a container.
+ * @return The meta mapped type of the a container.
+ */
+[[nodiscard]] inline meta_type meta_associative_container::mapped_type() const noexcept {
+ return mapped_type_node ? meta_type{*ctx, mapped_type_node(internal::meta_context::from(*ctx))} : meta_type{};
+}
+
+/*! @copydoc meta_sequence_container::value_type */
+[[nodiscard]] inline meta_type meta_associative_container::value_type() const noexcept {
+ return value_type_node ? meta_type{*ctx, value_type_node(internal::meta_context::from(*ctx))} : meta_type{};
+}
+
+/*! @copydoc meta_sequence_container::size */
+[[nodiscard]] inline meta_associative_container::size_type meta_associative_container::size() const noexcept {
+ return size_fn(data);
+}
+
+/*! @copydoc meta_sequence_container::clear */
+inline bool meta_associative_container::clear() {
+ return !const_only && clear_fn(const_cast<void *>(data));
+}
+
+/*! @copydoc meta_sequence_container::reserve */
+inline bool meta_associative_container::reserve(const size_type sz) {
+ return !const_only && reserve_fn(const_cast<void *>(data), sz);
+}
+
+/*! @copydoc meta_sequence_container::begin */
+[[nodiscard]] inline meta_associative_container::iterator meta_associative_container::begin() {
+ return begin_fn(*ctx, const_only ? nullptr : const_cast<void *>(data), data);
+}
+
+/*! @copydoc meta_sequence_container::end */
+[[nodiscard]] inline meta_associative_container::iterator meta_associative_container::end() {
+ return end_fn(*ctx, const_only ? nullptr : const_cast<void *>(data), data);
+}
+
+/**
+ * @brief Inserts a key-only or key/value element into a container.
+ * @param key The key of the element to insert.
+ * @param value The value of the element to insert, if needed.
+ * @return A bool denoting whether the insertion took place.
+ */
+inline bool meta_associative_container::insert(meta_any key, meta_any value = {}) {
+ return !const_only && key.allow_cast(meta_type{*ctx, key_type_node(internal::meta_context::from(*ctx))})
+ && (!mapped_type_node || value.allow_cast(meta_type{*ctx, mapped_type_node(internal::meta_context::from(*ctx))}))
+ && insert_fn(const_cast<void *>(data), std::as_const(key).data(), std::as_const(value).data());
+}
+
+/**
+ * @brief Removes the specified element from a container.
+ * @param key The key of the element to remove.
+ * @return A bool denoting whether the removal took place.
+ */
+inline meta_associative_container::size_type meta_associative_container::erase(meta_any key) {
+ return (!const_only && key.allow_cast(meta_type{*ctx, key_type_node(internal::meta_context::from(*ctx))})) ? erase_fn(const_cast<void *>(data), std::as_const(key).data()) : 0u;
+}
+
+/**
+ * @brief Returns an iterator to the element with a given key, if any.
+ * @param key The key of the element to search.
+ * @return An iterator to the element with the given key, if any.
+ */
+[[nodiscard]] inline meta_associative_container::iterator meta_associative_container::find(meta_any key) {
+ return key.allow_cast(meta_type{*ctx, key_type_node(internal::meta_context::from(*ctx))}) ? find_fn(*ctx, const_only ? nullptr : const_cast<void *>(data), data, std::as_const(key).data()) : iterator{};
+}
+
+/**
+ * @brief Returns false if a proxy is invalid, true otherwise.
+ * @return False if the proxy is invalid, true otherwise.
+ */
+[[nodiscard]] inline meta_associative_container::operator bool() const noexcept {
+ return (data != nullptr);
+}
+
+} // namespace entt
+
+#endif
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