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#ifndef ENTT_META_CONTAINER_HPP
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#define ENTT_META_CONTAINER_HPP
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#include <array>
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#include <deque>
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#include <iterator>
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#include <list>
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#include <map>
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#include <set>
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#include <type_traits>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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#include "../container/dense_map.hpp"
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#include "../container/dense_set.hpp"
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#include "context.hpp"
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#include "meta.hpp"
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#include "type_traits.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, typename = void>
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struct fixed_size_sequence_container: std::true_type {};
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template<typename Type>
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struct fixed_size_sequence_container<Type, std::void_t<decltype(&Type::clear)>>: std::false_type {};
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template<typename Type>
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inline constexpr bool fixed_size_sequence_container_v = fixed_size_sequence_container<Type>::value;
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template<typename, typename = void>
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struct key_only_associative_container: std::true_type {};
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template<typename Type>
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struct key_only_associative_container<Type, std::void_t<typename Type::mapped_type>>: std::false_type {};
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template<typename Type>
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inline constexpr bool key_only_associative_container_v = key_only_associative_container<Type>::value;
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template<typename, typename = void>
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struct reserve_aware_container: std::false_type {};
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template<typename Type>
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struct reserve_aware_container<Type, std::void_t<decltype(&Type::reserve)>>: std::true_type {};
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template<typename Type>
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inline constexpr bool reserve_aware_container_v = reserve_aware_container<Type>::value;
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} // namespace internal
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/*! @endcond */
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/**
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* @brief General purpose implementation of meta sequence container traits.
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* @tparam Type Type of underlying sequence container.
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*/
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template<typename Type>
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struct basic_meta_sequence_container_traits {
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static_assert(std::is_same_v<Type, std::remove_cv_t<std::remove_reference_t<Type>>>, "Unexpected type");
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/*! @brief True in case of key-only containers, false otherwise. */
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static constexpr bool fixed_size = internal::fixed_size_sequence_container_v<Type>;
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/*! @brief Unsigned integer type. */
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using size_type = typename meta_sequence_container::size_type;
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/*! @brief Meta iterator type. */
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using iterator = typename meta_sequence_container::iterator;
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/**
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* @brief Returns the number of elements in a container.
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* @param container Opaque pointer to a container of the given type.
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* @return Number of elements.
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*/
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[[nodiscard]] static size_type size(const void *container) {
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return static_cast<const Type *>(container)->size();
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}
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/**
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* @brief Clears a container.
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* @param container Opaque pointer to a container of the given type.
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* @return True in case of success, false otherwise.
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*/
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[[nodiscard]] static bool clear([[maybe_unused]] void *container) {
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if constexpr(fixed_size) {
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return false;
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} else {
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static_cast<Type *>(container)->clear();
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return true;
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}
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}
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/**
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* @brief Increases the capacity of a container.
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* @param container Opaque pointer to a container of the given type.
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* @param sz Desired capacity.
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* @return True in case of success, false otherwise.
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*/
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[[nodiscard]] static bool reserve([[maybe_unused]] void *container, [[maybe_unused]] const size_type sz) {
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if constexpr(internal::reserve_aware_container_v<Type>) {
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static_cast<Type *>(container)->reserve(sz);
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return true;
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} else {
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return false;
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}
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}
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/**
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* @brief Resizes a container.
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* @param container Opaque pointer to a container of the given type.
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* @param sz The new number of elements.
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* @return True in case of success, false otherwise.
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*/
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[[nodiscard]] static bool resize([[maybe_unused]] void *container, [[maybe_unused]] const size_type sz) {
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if constexpr(fixed_size || !std::is_default_constructible_v<typename Type::value_type>) {
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return false;
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} else {
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static_cast<Type *>(container)->resize(sz);
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return true;
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}
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}
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/**
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* @brief Returns a possibly const iterator to the beginning.
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* @param area The context to pass to the newly created iterator.
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* @param container Opaque pointer to a container of the given type.
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* @param as_const Const opaque pointer fallback.
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* @return An iterator to the first element of the container.
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*/
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static iterator begin(const meta_ctx &area, void *container, const void *as_const) {
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return container ? iterator{area, static_cast<Type *>(container)->begin()}
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: iterator{area, static_cast<const Type *>(as_const)->begin()};
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}
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/**
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* @brief Returns a possibly const iterator to the end.
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* @param area The context to pass to the newly created iterator.
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* @param container Opaque pointer to a container of the given type.
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* @param as_const Const opaque pointer fallback.
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* @return An iterator that is past the last element of the container.
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*/
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static iterator end(const meta_ctx &area, void *container, const void *as_const) {
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return container ? iterator{area, static_cast<Type *>(container)->end()}
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: iterator{area, static_cast<const Type *>(as_const)->end()};
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}
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/**
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* @brief Assigns one element to a container and constructs its object from
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* a given opaque instance.
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* @param area The context to pass to the newly created iterator.
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* @param container Opaque pointer to a container of the given type.
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* @param value Optional opaque instance of the object to construct (as
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* value type).
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* @param cref Optional opaque instance of the object to construct (as
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* decayed const reference type).
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* @param it Iterator before which the element will be inserted.
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* @return A possibly invalid iterator to the inserted element.
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*/
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[[nodiscard]] static iterator insert(const meta_ctx &area, [[maybe_unused]] void *container, [[maybe_unused]] const void *value, [[maybe_unused]] const void *cref, [[maybe_unused]] const iterator &it) {
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if constexpr(fixed_size) {
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return iterator{area};
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} else {
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auto *const non_const = any_cast<typename Type::iterator>(&it.base());
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return {area, static_cast<Type *>(container)->insert(
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non_const ? *non_const : any_cast<const typename Type::const_iterator &>(it.base()),
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value ? *static_cast<const typename Type::value_type *>(value) : *static_cast<const std::remove_reference_t<typename Type::const_reference> *>(cref))};
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}
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}
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/**
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* @brief Erases an element from a container.
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* @param area The context to pass to the newly created iterator.
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* @param container Opaque pointer to a container of the given type.
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* @param it An opaque iterator to the element to erase.
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* @return A possibly invalid iterator following the last removed element.
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*/
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[[nodiscard]] static iterator erase(const meta_ctx &area, [[maybe_unused]] void *container, [[maybe_unused]] const iterator &it) {
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if constexpr(fixed_size) {
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return iterator{area};
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} else {
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auto *const non_const = any_cast<typename Type::iterator>(&it.base());
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return {area, static_cast<Type *>(container)->erase(non_const ? *non_const : any_cast<const typename Type::const_iterator &>(it.base()))};
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}
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}
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};
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/**
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* @brief General purpose implementation of meta associative container traits.
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* @tparam Type Type of underlying associative container.
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*/
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template<typename Type>
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struct basic_meta_associative_container_traits {
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static_assert(std::is_same_v<Type, std::remove_cv_t<std::remove_reference_t<Type>>>, "Unexpected type");
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/*! @brief True in case of key-only containers, false otherwise. */
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static constexpr bool key_only = internal::key_only_associative_container_v<Type>;
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/*! @brief Unsigned integer type. */
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using size_type = typename meta_associative_container::size_type;
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/*! @brief Meta iterator type. */
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using iterator = typename meta_associative_container::iterator;
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/**
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* @brief Returns the number of elements in a container.
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* @param container Opaque pointer to a container of the given type.
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* @return Number of elements.
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*/
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[[nodiscard]] static size_type size(const void *container) {
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return static_cast<const Type *>(container)->size();
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}
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/**
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* @brief Clears a container.
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* @param container Opaque pointer to a container of the given type.
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* @return True in case of success, false otherwise.
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*/
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[[nodiscard]] static bool clear(void *container) {
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static_cast<Type *>(container)->clear();
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return true;
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}
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/**
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* @brief Increases the capacity of a container.
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* @param container Opaque pointer to a container of the given type.
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* @param sz Desired capacity.
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* @return True in case of success, false otherwise.
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*/
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[[nodiscard]] static bool reserve([[maybe_unused]] void *container, [[maybe_unused]] const size_type sz) {
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if constexpr(internal::reserve_aware_container_v<Type>) {
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static_cast<Type *>(container)->reserve(sz);
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return true;
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} else {
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return false;
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}
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}
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/**
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* @brief Returns a possibly const iterator to the beginning.
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* @param area The context to pass to the newly created iterator.
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* @param container Opaque pointer to a container of the given type.
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* @param as_const Const opaque pointer fallback.
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* @return An iterator to the first element of the container.
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*/
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static iterator begin(const meta_ctx &area, void *container, const void *as_const) {
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return container ? iterator{area, std::bool_constant<key_only>{}, static_cast<Type *>(container)->begin()}
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: iterator{area, std::bool_constant<key_only>{}, static_cast<const Type *>(as_const)->begin()};
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}
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/**
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* @brief Returns a possibly const iterator to the end.
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* @param area The context to pass to the newly created iterator.
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* @param container Opaque pointer to a container of the given type.
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* @param as_const Const opaque pointer fallback.
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* @return An iterator that is past the last element of the container.
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*/
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static iterator end(const meta_ctx &area, void *container, const void *as_const) {
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return container ? iterator{area, std::bool_constant<key_only>{}, static_cast<Type *>(container)->end()}
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: iterator{area, std::bool_constant<key_only>{}, static_cast<const Type *>(as_const)->end()};
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}
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/**
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* @brief Inserts an element into a container, if the key does not exist.
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* @param container Opaque pointer to a container of the given type.
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* @param key An opaque key value of an element to insert.
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* @param value Optional opaque value to insert (key-value containers).
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* @return True if the insertion took place, false otherwise.
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*/
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[[nodiscard]] static bool insert(void *container, const void *key, [[maybe_unused]] const void *value) {
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if constexpr(key_only) {
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return static_cast<Type *>(container)->insert(*static_cast<const typename Type::key_type *>(key)).second;
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} else {
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return static_cast<Type *>(container)->emplace(*static_cast<const typename Type::key_type *>(key), *static_cast<const typename Type::mapped_type *>(value)).second;
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}
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}
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/**
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* @brief Removes an element from a container.
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* @param container Opaque pointer to a container of the given type.
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* @param key An opaque key value of an element to remove.
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* @return Number of elements removed (either 0 or 1).
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*/
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[[nodiscard]] static size_type erase(void *container, const void *key) {
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return static_cast<Type *>(container)->erase(*static_cast<const typename Type::key_type *>(key));
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}
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/**
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* @brief Finds an element with a given key.
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* @param area The context to pass to the newly created iterator.
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* @param container Opaque pointer to a container of the given type.
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* @param as_const Const opaque pointer fallback.
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* @param key Opaque key value of an element to search for.
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* @return An iterator to the element with the given key, if any.
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*/
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static iterator find(const meta_ctx &area, void *container, const void *as_const, const void *key) {
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return container ? iterator{area, std::bool_constant<key_only>{}, static_cast<Type *>(container)->find(*static_cast<const typename Type::key_type *>(key))}
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: iterator{area, std::bool_constant<key_only>{}, static_cast<const Type *>(as_const)->find(*static_cast<const typename Type::key_type *>(key))};
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}
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};
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/**
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* @brief Meta sequence container traits for `std::vector`s of any type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_sequence_container_traits<std::vector<Args...>>
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: basic_meta_sequence_container_traits<std::vector<Args...>> {};
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/**
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* @brief Meta sequence container traits for `std::array`s of any type.
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* @tparam Type Template arguments for the container.
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* @tparam N Template arguments for the container.
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*/
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template<typename Type, auto N>
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struct meta_sequence_container_traits<std::array<Type, N>>
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: basic_meta_sequence_container_traits<std::array<Type, N>> {};
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/**
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* @brief Meta sequence container traits for `std::list`s of any type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_sequence_container_traits<std::list<Args...>>
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: basic_meta_sequence_container_traits<std::list<Args...>> {};
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/**
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* @brief Meta sequence container traits for `std::deque`s of any type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_sequence_container_traits<std::deque<Args...>>
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: basic_meta_sequence_container_traits<std::deque<Args...>> {};
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/**
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* @brief Meta associative container traits for `std::map`s of any type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_associative_container_traits<std::map<Args...>>
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: basic_meta_associative_container_traits<std::map<Args...>> {};
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/**
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* @brief Meta associative container traits for `std::unordered_map`s of any
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* type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_associative_container_traits<std::unordered_map<Args...>>
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: basic_meta_associative_container_traits<std::unordered_map<Args...>> {};
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/**
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* @brief Meta associative container traits for `std::set`s of any type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_associative_container_traits<std::set<Args...>>
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: basic_meta_associative_container_traits<std::set<Args...>> {};
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/**
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* @brief Meta associative container traits for `std::unordered_set`s of any
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* type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_associative_container_traits<std::unordered_set<Args...>>
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: basic_meta_associative_container_traits<std::unordered_set<Args...>> {};
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/**
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* @brief Meta associative container traits for `dense_map`s of any type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_associative_container_traits<dense_map<Args...>>
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: basic_meta_associative_container_traits<dense_map<Args...>> {};
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/**
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* @brief Meta associative container traits for `dense_set`s of any type.
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* @tparam Args Template arguments for the container.
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*/
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template<typename... Args>
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struct meta_associative_container_traits<dense_set<Args...>>
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: basic_meta_associative_container_traits<dense_set<Args...>> {};
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} // namespace entt
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#endif
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