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+/**
+ * MIT License
+ *
+ * Copyright (c) 2017 Thibaut Goetghebuer-Planchon <[email protected]>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef TSL_HOPSCOTCH_MAP_H
+#define TSL_HOPSCOTCH_MAP_H
+
+
+#include <algorithm>
+#include <cstddef>
+#include <functional>
+#include <initializer_list>
+#include <list>
+#include <memory>
+#include <type_traits>
+#include <utility>
+#include "hopscotch_hash.h"
+
+
+namespace tsl {
+
+/**
+ * Implementation of a hash map using the hopscotch hashing algorithm.
+ *
+ * The Key and the value T must be either nothrow move-constructible, copy-constructible or both.
+ *
+ * The size of the neighborhood (NeighborhoodSize) must be > 0 and <= 62 if StoreHash is false.
+ * When StoreHash is true, 32-bits of the hash will be stored alongside the neighborhood limiting
+ * the NeighborhoodSize to <= 30. There is no memory usage difference between
+ * 'NeighborhoodSize 62; StoreHash false' and 'NeighborhoodSize 30; StoreHash true'.
+ *
+ * Storing the hash may improve performance on insert during the rehash process if the hash takes time
+ * to compute. It may also improve read performance if the KeyEqual function takes time (or incurs a cache-miss).
+ * If used with simple Hash and KeyEqual it may slow things down.
+ *
+ * StoreHash can only be set if the GrowthPolicy is set to tsl::power_of_two_growth_policy.
+ *
+ * GrowthPolicy defines how the map grows and consequently how a hash value is mapped to a bucket.
+ * By default the map uses tsl::power_of_two_growth_policy. This policy keeps the number of buckets
+ * to a power of two and uses a mask to map the hash to a bucket instead of the slow modulo.
+ * You may define your own growth policy, check tsl::power_of_two_growth_policy for the interface.
+ *
+ * If the destructors of Key or T throw an exception, behaviour of the class is undefined.
+ *
+ * Iterators invalidation:
+ * - clear, operator=, reserve, rehash: always invalidate the iterators.
+ * - insert, emplace, emplace_hint, operator[]: if there is an effective insert, invalidate the iterators
+ * if a displacement is needed to resolve a collision (which mean that most of the time,
+ * insert will invalidate the iterators). Or if there is a rehash.
+ * - erase: iterator on the erased element is the only one which become invalid.
+ */
+template<class Key,
+ class T,
+ class Hash = std::hash<Key>,
+ class KeyEqual = std::equal_to<Key>,
+ class Allocator = std::allocator<std::pair<Key, T>>,
+ unsigned int NeighborhoodSize = 62,
+ bool StoreHash = false,
+ class GrowthPolicy = tsl::hh::power_of_two_growth_policy<2>>
+class hopscotch_map {
+private:
+ template<typename U>
+ using has_is_transparent = tsl::detail_hopscotch_hash::has_is_transparent<U>;
+
+ class KeySelect {
+ public:
+ using key_type = Key;
+
+ const key_type& operator()(const std::pair<Key, T>& key_value) const {
+ return key_value.first;
+ }
+
+ key_type& operator()(std::pair<Key, T>& key_value) {
+ return key_value.first;
+ }
+ };
+
+ class ValueSelect {
+ public:
+ using value_type = T;
+
+ const value_type& operator()(const std::pair<Key, T>& key_value) const {
+ return key_value.second;
+ }
+
+ value_type& operator()(std::pair<Key, T>& key_value) {
+ return key_value.second;
+ }
+ };
+
+
+ using overflow_container_type = std::list<std::pair<Key, T>, Allocator>;
+ using ht = detail_hopscotch_hash::hopscotch_hash<std::pair<Key, T>, KeySelect, ValueSelect,
+ Hash, KeyEqual,
+ Allocator, NeighborhoodSize,
+ StoreHash, GrowthPolicy,
+ overflow_container_type>;
+
+public:
+ using key_type = typename ht::key_type;
+ using mapped_type = T;
+ using value_type = typename ht::value_type;
+ using size_type = typename ht::size_type;
+ using difference_type = typename ht::difference_type;
+ using hasher = typename ht::hasher;
+ using key_equal = typename ht::key_equal;
+ using allocator_type = typename ht::allocator_type;
+ using reference = typename ht::reference;
+ using const_reference = typename ht::const_reference;
+ using pointer = typename ht::pointer;
+ using const_pointer = typename ht::const_pointer;
+ using iterator = typename ht::iterator;
+ using const_iterator = typename ht::const_iterator;
+
+
+
+ /*
+ * Constructors
+ */
+ hopscotch_map() : hopscotch_map(ht::DEFAULT_INIT_BUCKETS_SIZE) {
+ }
+
+ explicit hopscotch_map(size_type bucket_count,
+ const Hash& hash = Hash(),
+ const KeyEqual& equal = KeyEqual(),
+ const Allocator& alloc = Allocator()) :
+ m_ht(bucket_count, hash, equal, alloc, ht::DEFAULT_MAX_LOAD_FACTOR)
+ {
+ }
+
+ hopscotch_map(size_type bucket_count,
+ const Allocator& alloc) : hopscotch_map(bucket_count, Hash(), KeyEqual(), alloc)
+ {
+ }
+
+ hopscotch_map(size_type bucket_count,
+ const Hash& hash,
+ const Allocator& alloc) : hopscotch_map(bucket_count, hash, KeyEqual(), alloc)
+ {
+ }
+
+ explicit hopscotch_map(const Allocator& alloc) : hopscotch_map(ht::DEFAULT_INIT_BUCKETS_SIZE, alloc) {
+ }
+
+ template<class InputIt>
+ hopscotch_map(InputIt first, InputIt last,
+ size_type bucket_count = ht::DEFAULT_INIT_BUCKETS_SIZE,
+ const Hash& hash = Hash(),
+ const KeyEqual& equal = KeyEqual(),
+ const Allocator& alloc = Allocator()) : hopscotch_map(bucket_count, hash, equal, alloc)
+ {
+ insert(first, last);
+ }
+
+ template<class InputIt>
+ hopscotch_map(InputIt first, InputIt last,
+ size_type bucket_count,
+ const Allocator& alloc) : hopscotch_map(first, last, bucket_count, Hash(), KeyEqual(), alloc)
+ {
+ }
+
+ template<class InputIt>
+ hopscotch_map(InputIt first, InputIt last,
+ size_type bucket_count,
+ const Hash& hash,
+ const Allocator& alloc) : hopscotch_map(first, last, bucket_count, hash, KeyEqual(), alloc)
+ {
+ }
+
+ hopscotch_map(std::initializer_list<value_type> init,
+ size_type bucket_count = ht::DEFAULT_INIT_BUCKETS_SIZE,
+ const Hash& hash = Hash(),
+ const KeyEqual& equal = KeyEqual(),
+ const Allocator& alloc = Allocator()) :
+ hopscotch_map(init.begin(), init.end(), bucket_count, hash, equal, alloc)
+ {
+ }
+
+ hopscotch_map(std::initializer_list<value_type> init,
+ size_type bucket_count,
+ const Allocator& alloc) :
+ hopscotch_map(init.begin(), init.end(), bucket_count, Hash(), KeyEqual(), alloc)
+ {
+ }
+
+ hopscotch_map(std::initializer_list<value_type> init,
+ size_type bucket_count,
+ const Hash& hash,
+ const Allocator& alloc) :
+ hopscotch_map(init.begin(), init.end(), bucket_count, hash, KeyEqual(), alloc)
+ {
+ }
+
+
+ hopscotch_map& operator=(std::initializer_list<value_type> ilist) {
+ m_ht.clear();
+
+ m_ht.reserve(ilist.size());
+ m_ht.insert(ilist.begin(), ilist.end());
+
+ return *this;
+ }
+
+ allocator_type get_allocator() const { return m_ht.get_allocator(); }
+
+
+ /*
+ * Iterators
+ */
+ iterator begin() noexcept { return m_ht.begin(); }
+ const_iterator begin() const noexcept { return m_ht.begin(); }
+ const_iterator cbegin() const noexcept { return m_ht.cbegin(); }
+
+ iterator end() noexcept { return m_ht.end(); }
+ const_iterator end() const noexcept { return m_ht.end(); }
+ const_iterator cend() const noexcept { return m_ht.cend(); }
+
+
+ /*
+ * Capacity
+ */
+ bool empty() const noexcept { return m_ht.empty(); }
+ size_type size() const noexcept { return m_ht.size(); }
+ size_type max_size() const noexcept { return m_ht.max_size(); }
+
+ /*
+ * Modifiers
+ */
+ void clear() noexcept { m_ht.clear(); }
+
+
+
+
+ std::pair<iterator, bool> insert(const value_type& value) {
+ return m_ht.insert(value);
+ }
+
+ template<class P, typename std::enable_if<std::is_constructible<value_type, P&&>::value>::type* = nullptr>
+ std::pair<iterator, bool> insert(P&& value) {
+ return m_ht.insert(std::forward<P>(value));
+ }
+
+ std::pair<iterator, bool> insert(value_type&& value) {
+ return m_ht.insert(std::move(value));
+ }
+
+
+ iterator insert(const_iterator hint, const value_type& value) {
+ return m_ht.insert(hint, value);
+ }
+
+ template<class P, typename std::enable_if<std::is_constructible<value_type, P&&>::value>::type* = nullptr>
+ iterator insert(const_iterator hint, P&& value) {
+ return m_ht.insert(hint, std::forward<P>(value));
+ }
+
+ iterator insert(const_iterator hint, value_type&& value) {
+ return m_ht.insert(hint, std::move(value));
+ }
+
+
+ template<class InputIt>
+ void insert(InputIt first, InputIt last) {
+ m_ht.insert(first, last);
+ }
+
+ void insert(std::initializer_list<value_type> ilist) {
+ m_ht.insert(ilist.begin(), ilist.end());
+ }
+
+
+
+
+ template<class M>
+ std::pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj) {
+ return m_ht.insert_or_assign(k, std::forward<M>(obj));
+ }
+
+ template<class M>
+ std::pair<iterator, bool> insert_or_assign(key_type&& k, M&& obj) {
+ return m_ht.insert_or_assign(std::move(k), std::forward<M>(obj));
+ }
+
+ template<class M>
+ iterator insert_or_assign(const_iterator hint, const key_type& k, M&& obj) {
+ return m_ht.insert_or_assign(hint, k, std::forward<M>(obj));
+ }
+
+ template<class M>
+ iterator insert_or_assign(const_iterator hint, key_type&& k, M&& obj) {
+ return m_ht.insert_or_assign(hint, std::move(k), std::forward<M>(obj));
+ }
+
+
+
+
+ /**
+ * Due to the way elements are stored, emplace will need to move or copy the key-value once.
+ * The method is equivalent to insert(value_type(std::forward<Args>(args)...));
+ *
+ * Mainly here for compatibility with the std::unordered_map interface.
+ */
+ template<class... Args>
+ std::pair<iterator, bool> emplace(Args&&... args) {
+ return m_ht.emplace(std::forward<Args>(args)...);
+ }
+
+
+
+
+ /**
+ * Due to the way elements are stored, emplace_hint will need to move or copy the key-value once.
+ * The method is equivalent to insert(hint, value_type(std::forward<Args>(args)...));
+ *
+ * Mainly here for compatibility with the std::unordered_map interface.
+ */
+ template<class... Args>
+ iterator emplace_hint(const_iterator hint, Args&&... args) {
+ return m_ht.emplace_hint(hint, std::forward<Args>(args)...);
+ }
+
+
+
+
+ template<class... Args>
+ std::pair<iterator, bool> try_emplace(const key_type& k, Args&&... args) {
+ return m_ht.try_emplace(k, std::forward<Args>(args)...);
+ }
+
+ template<class... Args>
+ std::pair<iterator, bool> try_emplace(key_type&& k, Args&&... args) {
+ return m_ht.try_emplace(std::move(k), std::forward<Args>(args)...);
+ }
+
+ template<class... Args>
+ iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args) {
+ return m_ht.try_emplace(hint, k, std::forward<Args>(args)...);
+ }
+
+ template<class... Args>
+ iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args) {
+ return m_ht.try_emplace(hint, std::move(k), std::forward<Args>(args)...);
+ }
+
+
+
+
+ iterator erase(iterator pos) { return m_ht.erase(pos); }
+ iterator erase(const_iterator pos) { return m_ht.erase(pos); }
+ iterator erase(const_iterator first, const_iterator last) { return m_ht.erase(first, last); }
+ size_type erase(const key_type& key) { return m_ht.erase(key); }
+
+ /**
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup to the value if you already have the hash.
+ */
+ size_type erase(const key_type& key, std::size_t precalculated_hash) {
+ return m_ht.erase(key, precalculated_hash);
+ }
+
+ /**
+ * This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists.
+ * If so, K must be hashable and comparable to Key.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ size_type erase(const K& key) { return m_ht.erase(key); }
+
+ /**
+ * @copydoc erase(const K& key)
+ *
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup to the value if you already have the hash.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ size_type erase(const K& key, std::size_t precalculated_hash) {
+ return m_ht.erase(key, precalculated_hash);
+ }
+
+
+
+
+ void swap(hopscotch_map& other) { other.m_ht.swap(m_ht); }
+
+ /*
+ * Lookup
+ */
+ T& at(const Key& key) { return m_ht.at(key); }
+
+ /**
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ T& at(const Key& key, std::size_t precalculated_hash) { return m_ht.at(key, precalculated_hash); }
+
+
+ const T& at(const Key& key) const { return m_ht.at(key); }
+
+ /**
+ * @copydoc at(const Key& key, std::size_t precalculated_hash)
+ */
+ const T& at(const Key& key, std::size_t precalculated_hash) const { return m_ht.at(key, precalculated_hash); }
+
+
+ /**
+ * This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists.
+ * If so, K must be hashable and comparable to Key.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ T& at(const K& key) { return m_ht.at(key); }
+
+ /**
+ * @copydoc at(const K& key)
+ *
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ T& at(const K& key, std::size_t precalculated_hash) { return m_ht.at(key, precalculated_hash); }
+
+
+ /**
+ * @copydoc at(const K& key)
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ const T& at(const K& key) const { return m_ht.at(key); }
+
+ /**
+ * @copydoc at(const K& key, std::size_t precalculated_hash)
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ const T& at(const K& key, std::size_t precalculated_hash) const { return m_ht.at(key, precalculated_hash); }
+
+
+
+
+ T& operator[](const Key& key) { return m_ht[key]; }
+ T& operator[](Key&& key) { return m_ht[std::move(key)]; }
+
+
+
+
+ size_type count(const Key& key) const { return m_ht.count(key); }
+
+ /**
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ size_type count(const Key& key, std::size_t precalculated_hash) const {
+ return m_ht.count(key, precalculated_hash);
+ }
+
+ /**
+ * This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists.
+ * If so, K must be hashable and comparable to Key.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ size_type count(const K& key) const { return m_ht.count(key); }
+
+ /**
+ * @copydoc count(const K& key) const
+ *
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ size_type count(const K& key, std::size_t precalculated_hash) const { return m_ht.count(key, precalculated_hash); }
+
+
+
+
+ iterator find(const Key& key) { return m_ht.find(key); }
+
+ /**
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ iterator find(const Key& key, std::size_t precalculated_hash) { return m_ht.find(key, precalculated_hash); }
+
+ const_iterator find(const Key& key) const { return m_ht.find(key); }
+
+ /**
+ * @copydoc find(const Key& key, std::size_t precalculated_hash)
+ */
+ const_iterator find(const Key& key, std::size_t precalculated_hash) const {
+ return m_ht.find(key, precalculated_hash);
+ }
+
+ /**
+ * This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists.
+ * If so, K must be hashable and comparable to Key.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ iterator find(const K& key) { return m_ht.find(key); }
+
+ /**
+ * @copydoc find(const K& key)
+ *
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ iterator find(const K& key, std::size_t precalculated_hash) { return m_ht.find(key, precalculated_hash); }
+
+ /**
+ * @copydoc find(const K& key)
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ const_iterator find(const K& key) const { return m_ht.find(key); }
+
+ /**
+ * @copydoc find(const K& key)
+ *
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ const_iterator find(const K& key, std::size_t precalculated_hash) const {
+ return m_ht.find(key, precalculated_hash);
+ }
+
+
+
+
+ bool contains(const Key& key) const { return m_ht.contains(key); }
+
+ /**
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ bool contains(const Key& key, std::size_t precalculated_hash) const {
+ return m_ht.contains(key, precalculated_hash);
+ }
+
+ /**
+ * This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists.
+ * If so, K must be hashable and comparable to Key.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ bool contains(const K& key) const { return m_ht.contains(key); }
+
+ /**
+ * @copydoc contains(const K& key) const
+ *
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ bool contains(const K& key, std::size_t precalculated_hash) const {
+ return m_ht.contains(key, precalculated_hash);
+ }
+
+
+
+
+ std::pair<iterator, iterator> equal_range(const Key& key) { return m_ht.equal_range(key); }
+
+ /**
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ std::pair<iterator, iterator> equal_range(const Key& key, std::size_t precalculated_hash) {
+ return m_ht.equal_range(key, precalculated_hash);
+ }
+
+ std::pair<const_iterator, const_iterator> equal_range(const Key& key) const { return m_ht.equal_range(key); }
+
+ /**
+ * @copydoc equal_range(const Key& key, std::size_t precalculated_hash)
+ */
+ std::pair<const_iterator, const_iterator> equal_range(const Key& key, std::size_t precalculated_hash) const {
+ return m_ht.equal_range(key, precalculated_hash);
+ }
+
+ /**
+ * This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists.
+ * If so, K must be hashable and comparable to Key.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ std::pair<iterator, iterator> equal_range(const K& key) { return m_ht.equal_range(key); }
+
+
+ /**
+ * @copydoc equal_range(const K& key)
+ *
+ * Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same
+ * as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ std::pair<iterator, iterator> equal_range(const K& key, std::size_t precalculated_hash) {
+ return m_ht.equal_range(key, precalculated_hash);
+ }
+
+ /**
+ * @copydoc equal_range(const K& key)
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ std::pair<const_iterator, const_iterator> equal_range(const K& key) const { return m_ht.equal_range(key); }
+
+ /**
+ * @copydoc equal_range(const K& key, std::size_t precalculated_hash)
+ */
+ template<class K, class KE = KeyEqual, typename std::enable_if<has_is_transparent<KE>::value>::type* = nullptr>
+ std::pair<const_iterator, const_iterator> equal_range(const K& key, std::size_t precalculated_hash) const {
+ return m_ht.equal_range(key, precalculated_hash);
+ }
+
+
+
+
+ /*
+ * Bucket interface
+ */
+ size_type bucket_count() const { return m_ht.bucket_count(); }
+ size_type max_bucket_count() const { return m_ht.max_bucket_count(); }
+
+
+ /*
+ * Hash policy
+ */
+ float load_factor() const { return m_ht.load_factor(); }
+ float max_load_factor() const { return m_ht.max_load_factor(); }
+ void max_load_factor(float ml) { m_ht.max_load_factor(ml); }
+
+ void rehash(size_type count_) { m_ht.rehash(count_); }
+ void reserve(size_type count_) { m_ht.reserve(count_); }
+
+
+ /*
+ * Observers
+ */
+ hasher hash_function() const { return m_ht.hash_function(); }
+ key_equal key_eq() const { return m_ht.key_eq(); }
+
+ /*
+ * Other
+ */
+
+ /**
+ * Convert a const_iterator to an iterator.
+ */
+ iterator mutable_iterator(const_iterator pos) {
+ return m_ht.mutable_iterator(pos);
+ }
+
+ size_type overflow_size() const noexcept { return m_ht.overflow_size(); }
+
+ friend bool operator==(const hopscotch_map& lhs, const hopscotch_map& rhs) {
+ if(lhs.size() != rhs.size()) {
+ return false;
+ }
+
+ for(const auto& element_lhs : lhs) {
+ const auto it_element_rhs = rhs.find(element_lhs.first);
+ if(it_element_rhs == rhs.cend() || element_lhs.second != it_element_rhs->second) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ friend bool operator!=(const hopscotch_map& lhs, const hopscotch_map& rhs) {
+ return !operator==(lhs, rhs);
+ }
+
+ friend void swap(hopscotch_map& lhs, hopscotch_map& rhs) {
+ lhs.swap(rhs);
+ }
+
+
+
+private:
+ ht m_ht;
+};
+
+
+/**
+ * Same as `tsl::hopscotch_map<Key, T, Hash, KeyEqual, Allocator, NeighborhoodSize, StoreHash, tsl::hh::prime_growth_policy>`.
+ */
+template<class Key,
+ class T,
+ class Hash = std::hash<Key>,
+ class KeyEqual = std::equal_to<Key>,
+ class Allocator = std::allocator<std::pair<Key, T>>,
+ unsigned int NeighborhoodSize = 62,
+ bool StoreHash = false>
+using hopscotch_pg_map = hopscotch_map<Key, T, Hash, KeyEqual, Allocator, NeighborhoodSize, StoreHash, tsl::hh::prime_growth_policy>;
+
+} // end namespace tsl
+
+#endif