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 // Copyright 2018 The Abseil Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
 // -----------------------------------------------------------------------------
 // File: node_hash_map.h
 // -----------------------------------------------------------------------------
 //
 // An `absl::node_hash_map<K, V>` is an unordered associative container of
 // unique keys and associated values designed to be a more efficient replacement
 // for `std::unordered_map`. Like `unordered_map`, search, insertion, and
 // deletion of map elements can be done as an `O(1)` operation. However,
 // `node_hash_map` (and other unordered associative containers known as the
 // collection of Abseil "Swiss tables") contain other optimizations that result
 // in both memory and computation advantages.
 //
 // In most cases, your default choice for a hash map should be a map of type
 // `flat_hash_map`. However, if you need pointer stability and cannot store
 // a `flat_hash_map` with `unique_ptr` elements, a `node_hash_map` may be a
 // valid alternative. As well, if you are migrating your code from using
 // `std::unordered_map`, a `node_hash_map` provides a more straightforward
 // migration, because it guarantees pointer stability. Consider migrating to
 // `node_hash_map` and perhaps converting to a more efficient `flat_hash_map`
 // upon further review.
 //
 // `node_hash_map` is not exception-safe.
 
 #ifndef ABSL_CONTAINER_NODE_HASH_MAP_H_
 #define ABSL_CONTAINER_NODE_HASH_MAP_H_
 
 #include <cstddef>
 #include <memory>
 #include <type_traits>
 #include <utility>
 
 #include "absl/algorithm/container.h"
 #include "absl/base/attributes.h"
 #include "absl/container/hash_container_defaults.h"
 #include "absl/container/internal/container_memory.h"
 #include "absl/container/internal/node_slot_policy.h"
 #include "absl/container/internal/raw_hash_map.h"  // IWYU pragma: export
 #include "absl/memory/memory.h"
 #include "absl/meta/type_traits.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
 namespace container_internal {
 template <class Key, class Value>
 class NodeHashMapPolicy;
 }  // namespace container_internal
 
 // -----------------------------------------------------------------------------
 // absl::node_hash_map
 // -----------------------------------------------------------------------------
 //
 // An `absl::node_hash_map<K, V>` is an unordered associative container which
 // has been optimized for both speed and memory footprint in most common use
 // cases. Its interface is similar to that of `std::unordered_map<K, V>` with
 // the following notable differences:
 //
 // * Supports heterogeneous lookup, through `find()`, `operator[]()` and
 //   `insert()`, provided that the map is provided a compatible heterogeneous
 //   hashing function and equality operator. See below for details.
 // * Contains a `capacity()` member function indicating the number of element
 //   slots (open, deleted, and empty) within the hash map.
 // * Returns `void` from the `erase(iterator)` overload.
 //
 // By default, `node_hash_map` uses the `absl::Hash` hashing framework.
 // All fundamental and Abseil types that support the `absl::Hash` framework have
 // a compatible equality operator for comparing insertions into `node_hash_map`.
 // If your type is not yet supported by the `absl::Hash` framework, see
 // absl/hash/hash.h for information on extending Abseil hashing to user-defined
 // types.
 //
 // Using `absl::node_hash_map` at interface boundaries in dynamically loaded
 // libraries (e.g. .dll, .so) is unsupported due to way `absl::Hash` values may
 // be randomized across dynamically loaded libraries.
 //
 // To achieve heterogeneous lookup for custom types either `Hash` and `Eq` type
 // parameters can be used or `T` should have public inner types
 // `absl_container_hash` and (optionally) `absl_container_eq`. In either case,
 // `typename Hash::is_transparent` and `typename Eq::is_transparent` should be
 // well-formed. Both types are basically functors:
 // * `Hash` should support `size_t operator()(U val) const` that returns a hash
 // for the given `val`.
 // * `Eq` should support `bool operator()(U lhs, V rhs) const` that returns true
 // if `lhs` is equal to `rhs`.
 //
 // In most cases `T` needs only to provide the `absl_container_hash`. In this
 // case `std::equal_to<void>` will be used instead of `eq` part.
 //
 // Example:
 //
 //   // Create a node hash map of three strings (that map to strings)
 //   absl::node_hash_map<std::string, std::string> ducks =
 //     {{"a", "huey"}, {"b", "dewey"}, {"c", "louie"}};
 //
 //  // Insert a new element into the node hash map
 //  ducks.insert({"d", "donald"}};
 //
 //  // Force a rehash of the node hash map
 //  ducks.rehash(0);
 //
 //  // Find the element with the key "b"
 //  std::string search_key = "b";
 //  auto result = ducks.find(search_key);
 //  if (result != ducks.end()) {
 //    std::cout << "Result: " << result->second << std::endl;
 //  }
 template <class Key, class Value, class Hash = DefaultHashContainerHash<Key>,
           class Eq = DefaultHashContainerEq<Key>,
           class Alloc = std::allocator<std::pair<const Key, Value>>>
 class ABSL_INTERNAL_ATTRIBUTE_OWNER node_hash_map
     : public absl::container_internal::raw_hash_map<
           absl::container_internal::NodeHashMapPolicy<Key, Value>, Hash, Eq,
           Alloc> {
   using Base = typename node_hash_map::raw_hash_map;
 
  public:
   // Constructors and Assignment Operators
   //
   // A node_hash_map supports the same overload set as `std::unordered_map`
   // for construction and assignment:
   //
   // *  Default constructor
   //
   //    // No allocation for the table's elements is made.
   //    absl::node_hash_map<int, std::string> map1;
   //
   // * Initializer List constructor
   //
   //   absl::node_hash_map<int, std::string> map2 =
   //       {{1, "huey"}, {2, "dewey"}, {3, "louie"},};
   //
   // * Copy constructor
   //
   //   absl::node_hash_map<int, std::string> map3(map2);
   //
   // * Copy assignment operator
   //
   //  // Hash functor and Comparator are copied as well
   //  absl::node_hash_map<int, std::string> map4;
   //  map4 = map3;
   //
   // * Move constructor
   //
   //   // Move is guaranteed efficient
   //   absl::node_hash_map<int, std::string> map5(std::move(map4));
   //
   // * Move assignment operator
   //
   //   // May be efficient if allocators are compatible
   //   absl::node_hash_map<int, std::string> map6;
   //   map6 = std::move(map5);
   //
   // * Range constructor
   //
   //   std::vector<std::pair<int, std::string>> v = {{1, "a"}, {2, "b"}};
   //   absl::node_hash_map<int, std::string> map7(v.begin(), v.end());
   node_hash_map() {}
   using Base::Base;
 
   // node_hash_map::begin()
   //
   // Returns an iterator to the beginning of the `node_hash_map`.
   using Base::begin;
 
   // node_hash_map::cbegin()
   //
   // Returns a const iterator to the beginning of the `node_hash_map`.
   using Base::cbegin;
 
   // node_hash_map::cend()
   //
   // Returns a const iterator to the end of the `node_hash_map`.
   using Base::cend;
 
   // node_hash_map::end()
   //
   // Returns an iterator to the end of the `node_hash_map`.
   using Base::end;
 
   // node_hash_map::capacity()
   //
   // Returns the number of element slots (assigned, deleted, and empty)
   // available within the `node_hash_map`.
   //
   // NOTE: this member function is particular to `absl::node_hash_map` and is
   // not provided in the `std::unordered_map` API.
   using Base::capacity;
 
   // node_hash_map::empty()
   //
   // Returns whether or not the `node_hash_map` is empty.
   using Base::empty;
 
   // node_hash_map::max_size()
   //
   // Returns the largest theoretical possible number of elements within a
   // `node_hash_map` under current memory constraints. This value can be thought
   // of as the largest value of `std::distance(begin(), end())` for a
   // `node_hash_map<K, V>`.
   using Base::max_size;
 
   // node_hash_map::size()
   //
   // Returns the number of elements currently within the `node_hash_map`.
   using Base::size;
 
   // node_hash_map::clear()
   //
   // Removes all elements from the `node_hash_map`. Invalidates any references,
   // pointers, or iterators referring to contained elements.
   //
   // NOTE: this operation may shrink the underlying buffer. To avoid shrinking
   // the underlying buffer call `erase(begin(), end())`.
   using Base::clear;
 
   // node_hash_map::erase()
   //
   // Erases elements within the `node_hash_map`. Erasing does not trigger a
   // rehash. Overloads are listed below.
   //
   // void erase(const_iterator pos):
   //
   //   Erases the element at `position` of the `node_hash_map`, returning
   //   `void`.
   //
   //   NOTE: this return behavior is different than that of STL containers in
   //   general and `std::unordered_map` in particular.
   //
   // iterator erase(const_iterator first, const_iterator last):
   //
   //   Erases the elements in the open interval [`first`, `last`), returning an
   //   iterator pointing to `last`. The special case of calling
   //   `erase(begin(), end())` resets the reserved growth such that if
   //   `reserve(N)` has previously been called and there has been no intervening
   //   call to `clear()`, then after calling `erase(begin(), end())`, it is safe
   //   to assume that inserting N elements will not cause a rehash.
   //
   // size_type erase(const key_type& key):
   //
   //   Erases the element with the matching key, if it exists, returning the
   //   number of elements erased (0 or 1).
   using Base::erase;
 
   // node_hash_map::insert()
   //
   // Inserts an element of the specified value into the `node_hash_map`,
   // returning an iterator pointing to the newly inserted element, provided that
   // an element with the given key does not already exist. If rehashing occurs
   // due to the insertion, all iterators are invalidated. Overloads are listed
   // below.
   //
   // std::pair<iterator,bool> insert(const init_type& value):
   //
   //   Inserts a value into the `node_hash_map`. Returns a pair consisting of an
   //   iterator to the inserted element (or to the element that prevented the
   //   insertion) and a `bool` denoting whether the insertion took place.
   //
   // std::pair<iterator,bool> insert(T&& value):
   // std::pair<iterator,bool> insert(init_type&& value):
   //
   //   Inserts a moveable value into the `node_hash_map`. Returns a `std::pair`
   //   consisting of an iterator to the inserted element (or to the element that
   //   prevented the insertion) and a `bool` denoting whether the insertion took
   //   place.
   //
   // iterator insert(const_iterator hint, const init_type& value):
   // iterator insert(const_iterator hint, T&& value):
   // iterator insert(const_iterator hint, init_type&& value);
   //
   //   Inserts a value, using the position of `hint` as a non-binding suggestion
   //   for where to begin the insertion search. Returns an iterator to the
   //   inserted element, or to the existing element that prevented the
   //   insertion.
   //
   // void insert(InputIterator first, InputIterator last):
   //
   //   Inserts a range of values [`first`, `last`).
   //
   //   NOTE: Although the STL does not specify which element may be inserted if
   //   multiple keys compare equivalently, for `node_hash_map` we guarantee the
   //   first match is inserted.
   //
   // void insert(std::initializer_list<init_type> ilist):
   //
   //   Inserts the elements within the initializer list `ilist`.
   //
   //   NOTE: Although the STL does not specify which element may be inserted if
   //   multiple keys compare equivalently within the initializer list, for
   //   `node_hash_map` we guarantee the first match is inserted.
   using Base::insert;
 
   // node_hash_map::insert_or_assign()
   //
   // Inserts an element of the specified value into the `node_hash_map` provided
   // that a value with the given key does not already exist, or replaces it with
   // the element value if a key for that value already exists, returning an
   // iterator pointing to the newly inserted element. If rehashing occurs due to
   // the insertion, all iterators are invalidated. Overloads are listed
   // below.
   //
   // std::pair<iterator, bool> insert_or_assign(const init_type& k, T&& obj):
   // std::pair<iterator, bool> insert_or_assign(init_type&& k, T&& obj):
   //
   //   Inserts/Assigns (or moves) the element of the specified key into the
   //   `node_hash_map`.
   //
   // iterator insert_or_assign(const_iterator hint,
   //                           const init_type& k, T&& obj):
   // iterator insert_or_assign(const_iterator hint, init_type&& k, T&& obj):
   //
   //   Inserts/Assigns (or moves) the element of the specified key into the
   //   `node_hash_map` using the position of `hint` as a non-binding suggestion
   //   for where to begin the insertion search.
   using Base::insert_or_assign;
 
   // node_hash_map::emplace()
   //
   // Inserts an element of the specified value by constructing it in-place
   // within the `node_hash_map`, provided that no element with the given key
   // already exists.
   //
   // The element may be constructed even if there already is an element with the
   // key in the container, in which case the newly constructed element will be
   // destroyed immediately. Prefer `try_emplace()` unless your key is not
   // copyable or moveable.
   //
   // If rehashing occurs due to the insertion, all iterators are invalidated.
   using Base::emplace;
 
   // node_hash_map::emplace_hint()
   //
   // Inserts an element of the specified value by constructing it in-place
   // within the `node_hash_map`, using the position of `hint` as a non-binding
   // suggestion for where to begin the insertion search, and only inserts
   // provided that no element with the given key already exists.
   //
   // The element may be constructed even if there already is an element with the
   // key in the container, in which case the newly constructed element will be
   // destroyed immediately. Prefer `try_emplace()` unless your key is not
   // copyable or moveable.
   //
   // If rehashing occurs due to the insertion, all iterators are invalidated.
   using Base::emplace_hint;
 
   // node_hash_map::try_emplace()
   //
   // Inserts an element of the specified value by constructing it in-place
   // within the `node_hash_map`, provided that no element with the given key
   // already exists. Unlike `emplace()`, if an element with the given key
   // already exists, we guarantee that no element is constructed.
   //
   // If rehashing occurs due to the insertion, all iterators are invalidated.
   // Overloads are listed below.
   //
   //   std::pair<iterator, bool> try_emplace(const key_type& k, Args&&... args):
   //   std::pair<iterator, bool> try_emplace(key_type&& k, Args&&... args):
   //
   // Inserts (via copy or move) the element of the specified key into the
   // `node_hash_map`.
   //
   //   iterator try_emplace(const_iterator hint,
   //                        const key_type& k, Args&&... args):
   //   iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args):
   //
   // Inserts (via copy or move) the element of the specified key into the
   // `node_hash_map` using the position of `hint` as a non-binding suggestion
   // for where to begin the insertion search.
   //
   // All `try_emplace()` overloads make the same guarantees regarding rvalue
   // arguments as `std::unordered_map::try_emplace()`, namely that these
   // functions will not move from rvalue arguments if insertions do not happen.
   using Base::try_emplace;
 
   // node_hash_map::extract()
   //
   // Extracts the indicated element, erasing it in the process, and returns it
   // as a C++17-compatible node handle. Overloads are listed below.
   //
   // node_type extract(const_iterator position):
   //
   //   Extracts the key,value pair of the element at the indicated position and
   //   returns a node handle owning that extracted data.
   //
   // node_type extract(const key_type& x):
   //
   //   Extracts the key,value pair of the element with a key matching the passed
   //   key value and returns a node handle owning that extracted data. If the
   //   `node_hash_map` does not contain an element with a matching key, this
   //   function returns an empty node handle.
   //
   // NOTE: when compiled in an earlier version of C++ than C++17,
   // `node_type::key()` returns a const reference to the key instead of a
   // mutable reference. We cannot safely return a mutable reference without
   // std::launder (which is not available before C++17).
   using Base::extract;
 
   // node_hash_map::merge()
   //
   // Extracts elements from a given `source` node hash map into this
   // `node_hash_map`. If the destination `node_hash_map` already contains an
   // element with an equivalent key, that element is not extracted.
   using Base::merge;
 
   // node_hash_map::swap(node_hash_map& other)
   //
   // Exchanges the contents of this `node_hash_map` with those of the `other`
   // node hash map, avoiding invocation of any move, copy, or swap operations on
   // individual elements.
   //
   // All iterators and references on the `node_hash_map` remain valid, excepting
   // for the past-the-end iterator, which is invalidated.
   //
   // `swap()` requires that the node hash map's hashing and key equivalence
   // functions be Swappable, and are exchanged using unqualified calls to
   // non-member `swap()`. If the map's allocator has
   // `std::allocator_traits<allocator_type>::propagate_on_container_swap::value`
   // set to `true`, the allocators are also exchanged using an unqualified call
   // to non-member `swap()`; otherwise, the allocators are not swapped.
   using Base::swap;
 
   // node_hash_map::rehash(count)
   //
   // Rehashes the `node_hash_map`, setting the number of slots to be at least
   // the passed value. If the new number of slots increases the load factor more
   // than the current maximum load factor
   // (`count` < `size()` / `max_load_factor()`), then the new number of slots
   // will be at least `size()` / `max_load_factor()`.
   //
   // To force a rehash, pass rehash(0).
   using Base::rehash;
 
   // node_hash_map::reserve(count)
   //
   // Sets the number of slots in the `node_hash_map` to the number needed to
   // accommodate at least `count` total elements without exceeding the current
   // maximum load factor, and may rehash the container if needed.
   using Base::reserve;
 
   // node_hash_map::at()
   //
   // Returns a reference to the mapped value of the element with key equivalent
   // to the passed key.
   using Base::at;
 
   // node_hash_map::contains()
   //
   // Determines whether an element with a key comparing equal to the given `key`
   // exists within the `node_hash_map`, returning `true` if so or `false`
   // otherwise.
   using Base::contains;
 
   // node_hash_map::count(const Key& key) const
   //
   // Returns the number of elements with a key comparing equal to the given
   // `key` within the `node_hash_map`. note that this function will return
   // either `1` or `0` since duplicate keys are not allowed within a
   // `node_hash_map`.
   using Base::count;
 
   // node_hash_map::equal_range()
   //
   // Returns a closed range [first, last], defined by a `std::pair` of two
   // iterators, containing all elements with the passed key in the
   // `node_hash_map`.
   using Base::equal_range;
 
   // node_hash_map::find()
   //
   // Finds an element with the passed `key` within the `node_hash_map`.
   using Base::find;
 
   // node_hash_map::operator[]()
   //
   // Returns a reference to the value mapped to the passed key within the
   // `node_hash_map`, performing an `insert()` if the key does not already
   // exist. If an insertion occurs and results in a rehashing of the container,
   // all iterators are invalidated. Otherwise iterators are not affected and
   // references are not invalidated. Overloads are listed below.
   //
   // T& operator[](const Key& key):
   //
   //   Inserts an init_type object constructed in-place if the element with the
   //   given key does not exist.
   //
   // T& operator[](Key&& key):
   //
   //   Inserts an init_type object constructed in-place provided that an element
   //   with the given key does not exist.
   using Base::operator[];
 
   // node_hash_map::bucket_count()
   //
   // Returns the number of "buckets" within the `node_hash_map`.
   using Base::bucket_count;
 
   // node_hash_map::load_factor()
   //
   // Returns the current load factor of the `node_hash_map` (the average number
   // of slots occupied with a value within the hash map).
   using Base::load_factor;
 
   // node_hash_map::max_load_factor()
   //
   // Manages the maximum load factor of the `node_hash_map`. Overloads are
   // listed below.
   //
   // float node_hash_map::max_load_factor()
   //
   //   Returns the current maximum load factor of the `node_hash_map`.
   //
   // void node_hash_map::max_load_factor(float ml)
   //
   //   Sets the maximum load factor of the `node_hash_map` to the passed value.
   //
   //   NOTE: This overload is provided only for API compatibility with the STL;
   //   `node_hash_map` will ignore any set load factor and manage its rehashing
   //   internally as an implementation detail.
   using Base::max_load_factor;
 
   // node_hash_map::get_allocator()
   //
   // Returns the allocator function associated with this `node_hash_map`.
   using Base::get_allocator;
 
   // node_hash_map::hash_function()
   //
   // Returns the hashing function used to hash the keys within this
   // `node_hash_map`.
   using Base::hash_function;
 
   // node_hash_map::key_eq()
   //
   // Returns the function used for comparing keys equality.
   using Base::key_eq;
 };
 
 // erase_if(node_hash_map<>, Pred)
 //
 // Erases all elements that satisfy the predicate `pred` from the container `c`.
 // Returns the number of erased elements.
 template <typename K, typename V, typename H, typename E, typename A,
           typename Predicate>
 typename node_hash_map<K, V, H, E, A>::size_type erase_if(
     node_hash_map<K, V, H, E, A>& c, Predicate pred) {
   return container_internal::EraseIf(pred, &c);
 }
 
 namespace container_internal {
 
 // c_for_each_fast(node_hash_map<>, Function)
 //
 // Container-based version of the <algorithm> `std::for_each()` function to
 // apply a function to a container's elements.
 // There is no guarantees on the order of the function calls.
 // Erasure and/or insertion of elements in the function is not allowed.
 template <typename K, typename V, typename H, typename E, typename A,
           typename Function>
 decay_t<Function> c_for_each_fast(const node_hash_map<K, V, H, E, A>& c,
                                   Function&& f) {
   container_internal::ForEach(f, &c);
   return f;
 }
 template <typename K, typename V, typename H, typename E, typename A,
           typename Function>
 decay_t<Function> c_for_each_fast(node_hash_map<K, V, H, E, A>& c,
                                   Function&& f) {
   container_internal::ForEach(f, &c);
   return f;
 }
 template <typename K, typename V, typename H, typename E, typename A,
           typename Function>
 decay_t<Function> c_for_each_fast(node_hash_map<K, V, H, E, A>&& c,
                                   Function&& f) {
   container_internal::ForEach(f, &c);
   return f;
 }
 
 }  // namespace container_internal
 
 namespace container_internal {
 
 template <class Key, class Value>
 class NodeHashMapPolicy
     : public absl::container_internal::node_slot_policy<
           std::pair<const Key, Value>&, NodeHashMapPolicy<Key, Value>> {
   using value_type = std::pair<const Key, Value>;
 
  public:
   using key_type = Key;
   using mapped_type = Value;
   using init_type = std::pair</*non const*/ key_type, mapped_type>;
 
   template <class Allocator, class... Args>
   static value_type* new_element(Allocator* alloc, Args&&... args) {
     using PairAlloc = typename absl::allocator_traits<
         Allocator>::template rebind_alloc<value_type>;
     PairAlloc pair_alloc(*alloc);
     value_type* res =
         absl::allocator_traits<PairAlloc>::allocate(pair_alloc, 1);
     absl::allocator_traits<PairAlloc>::construct(pair_alloc, res,
                                                  std::forward<Args>(args)...);
     return res;
   }
 
   template <class Allocator>
   static void delete_element(Allocator* alloc, value_type* pair) {
     using PairAlloc = typename absl::allocator_traits<
         Allocator>::template rebind_alloc<value_type>;
     PairAlloc pair_alloc(*alloc);
     absl::allocator_traits<PairAlloc>::destroy(pair_alloc, pair);
     absl::allocator_traits<PairAlloc>::deallocate(pair_alloc, pair, 1);
   }
 
   template <class F, class... Args>
   static decltype(absl::container_internal::DecomposePair(
       std::declval<F>(), std::declval<Args>()...))
   apply(F&& f, Args&&... args) {
     return absl::container_internal::DecomposePair(std::forward<F>(f),
                                                    std::forward<Args>(args)...);
   }
 
   static size_t element_space_used(const value_type*) {
     return sizeof(value_type);
   }
 
   static Value& value(value_type* elem) { return elem->second; }
   static const Value& value(const value_type* elem) { return elem->second; }
 
   template <class Hash>
   static constexpr HashSlotFn get_hash_slot_fn() {
     return memory_internal::IsLayoutCompatible<Key, Value>::value
                ? &TypeErasedDerefAndApplyToSlotFn<Hash, Key>
                : nullptr;
   }
 };
 }  // namespace container_internal
 
 namespace container_algorithm_internal {
 
 // Specialization of trait in absl/algorithm/container.h
 template <class Key, class T, class Hash, class KeyEqual, class Allocator>
 struct IsUnorderedContainer<
     absl::node_hash_map<Key, T, Hash, KeyEqual, Allocator>> : std::true_type {};
 
 }  // namespace container_algorithm_internal
 
 ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_CONTAINER_NODE_HASH_MAP_H_

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