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 // Copyright (C) 2022-2023 Christian Mazakas
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 #ifndef BOOST_UNORDERED_UNORDERED_FLAT_MAP_HPP_INCLUDED
 #define BOOST_UNORDERED_UNORDERED_FLAT_MAP_HPP_INCLUDED
 
 #include <boost/config.hpp>
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #pragma once
 #endif
 
 #include <boost/unordered/concurrent_flat_map_fwd.hpp>
 #include <boost/unordered/detail/foa/flat_map_types.hpp>
 #include <boost/unordered/detail/foa/table.hpp>
 #include <boost/unordered/detail/serialize_container.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
 #include <boost/unordered/unordered_flat_map_fwd.hpp>
 
 #include <boost/core/allocator_access.hpp>
 #include <boost/container_hash/hash.hpp>
 #include <boost/throw_exception.hpp>
 
 #include <initializer_list>
 #include <iterator>
 #include <stdexcept>
 #include <type_traits>
 #include <utility>
 
 namespace boost {
   namespace unordered {
 
 #if defined(BOOST_MSVC)
 #pragma warning(push)
 #pragma warning(disable : 4714) /* marked as __forceinline not inlined */
 #endif
 
     template <class Key, class T, class Hash, class KeyEqual, class Allocator>
     class unordered_flat_map
     {
       template <class Key2, class T2, class Hash2, class Pred2,
         class Allocator2>
       friend class concurrent_flat_map;
 
       using map_types = detail::foa::flat_map_types<Key, T>;
 
       using table_type = detail::foa::table<map_types, Hash, KeyEqual,
         typename boost::allocator_rebind<Allocator,
           typename map_types::value_type>::type>;
 
       table_type table_;
 
       template <class K, class V, class H, class KE, class A>
       bool friend operator==(unordered_flat_map<K, V, H, KE, A> const& lhs,
         unordered_flat_map<K, V, H, KE, A> const& rhs);
 
       template <class K, class V, class H, class KE, class A, class Pred>
       typename unordered_flat_map<K, V, H, KE, A>::size_type friend erase_if(
         unordered_flat_map<K, V, H, KE, A>& set, Pred pred);
 
     public:
       using key_type = Key;
       using mapped_type = T;
       using value_type = typename map_types::value_type;
       using init_type = typename map_types::init_type;
       using size_type = std::size_t;
       using difference_type = std::ptrdiff_t;
       using hasher = typename boost::unordered::detail::type_identity<Hash>::type;
       using key_equal = typename boost::unordered::detail::type_identity<KeyEqual>::type;
       using allocator_type = typename boost::unordered::detail::type_identity<Allocator>::type;
       using reference = value_type&;
       using const_reference = value_type const&;
       using pointer = typename boost::allocator_pointer<allocator_type>::type;
       using const_pointer =
         typename boost::allocator_const_pointer<allocator_type>::type;
       using iterator = typename table_type::iterator;
       using const_iterator = typename table_type::const_iterator;
 
       unordered_flat_map() : unordered_flat_map(0) {}
 
       explicit unordered_flat_map(size_type n, hasher const& h = hasher(),
         key_equal const& pred = key_equal(),
         allocator_type const& a = allocator_type())
           : table_(n, h, pred, a)
       {
       }
 
       unordered_flat_map(size_type n, allocator_type const& a)
           : unordered_flat_map(n, hasher(), key_equal(), a)
       {
       }
 
       unordered_flat_map(size_type n, hasher const& h, allocator_type const& a)
           : unordered_flat_map(n, h, key_equal(), a)
       {
       }
 
       template <class InputIterator>
       unordered_flat_map(
         InputIterator f, InputIterator l, allocator_type const& a)
           : unordered_flat_map(f, l, size_type(0), hasher(), key_equal(), a)
       {
       }
 
       explicit unordered_flat_map(allocator_type const& a)
           : unordered_flat_map(0, a)
       {
       }
 
       template <class Iterator>
       unordered_flat_map(Iterator first, Iterator last, size_type n = 0,
         hasher const& h = hasher(), key_equal const& pred = key_equal(),
         allocator_type const& a = allocator_type())
           : unordered_flat_map(n, h, pred, a)
       {
         this->insert(first, last);
       }
 
       template <class Iterator>
       unordered_flat_map(
         Iterator first, Iterator last, size_type n, allocator_type const& a)
           : unordered_flat_map(first, last, n, hasher(), key_equal(), a)
       {
       }
 
       template <class Iterator>
       unordered_flat_map(Iterator first, Iterator last, size_type n,
         hasher const& h, allocator_type const& a)
           : unordered_flat_map(first, last, n, h, key_equal(), a)
       {
       }
 
       unordered_flat_map(unordered_flat_map const& other) : table_(other.table_)
       {
       }
 
       unordered_flat_map(
         unordered_flat_map const& other, allocator_type const& a)
           : table_(other.table_, a)
       {
       }
 
       unordered_flat_map(unordered_flat_map&& other)
         noexcept(std::is_nothrow_move_constructible<table_type>::value)
           : table_(std::move(other.table_))
       {
       }
 
       unordered_flat_map(unordered_flat_map&& other, allocator_type const& al)
           : table_(std::move(other.table_), al)
       {
       }
 
       unordered_flat_map(std::initializer_list<value_type> ilist,
         size_type n = 0, hasher const& h = hasher(),
         key_equal const& pred = key_equal(),
         allocator_type const& a = allocator_type())
           : unordered_flat_map(ilist.begin(), ilist.end(), n, h, pred, a)
       {
       }
 
       unordered_flat_map(
         std::initializer_list<value_type> il, allocator_type const& a)
           : unordered_flat_map(il, size_type(0), hasher(), key_equal(), a)
       {
       }
 
       unordered_flat_map(std::initializer_list<value_type> init, size_type n,
         allocator_type const& a)
           : unordered_flat_map(init, n, hasher(), key_equal(), a)
       {
       }
 
       unordered_flat_map(std::initializer_list<value_type> init, size_type n,
         hasher const& h, allocator_type const& a)
           : unordered_flat_map(init, n, h, key_equal(), a)
       {
       }
 
       unordered_flat_map(
         concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
 
       ~unordered_flat_map() = default;
 
       unordered_flat_map& operator=(unordered_flat_map const& other)
       {
         table_ = other.table_;
         return *this;
       }
 
       unordered_flat_map& operator=(unordered_flat_map&& other) noexcept(
         noexcept(std::declval<table_type&>() = std::declval<table_type&&>()))
       {
         table_ = std::move(other.table_);
         return *this;
       }
 
       allocator_type get_allocator() const noexcept
       {
         return table_.get_allocator();
       }
 
       /// Iterators
       ///
 
       iterator begin() noexcept { return table_.begin(); }
       const_iterator begin() const noexcept { return table_.begin(); }
       const_iterator cbegin() const noexcept { return table_.cbegin(); }
 
       iterator end() noexcept { return table_.end(); }
       const_iterator end() const noexcept { return table_.end(); }
       const_iterator cend() const noexcept { return table_.cend(); }
 
       /// Capacity
       ///
 
       BOOST_ATTRIBUTE_NODISCARD bool empty() const noexcept
       {
         return table_.empty();
       }
 
       size_type size() const noexcept { return table_.size(); }
 
       size_type max_size() const noexcept { return table_.max_size(); }
 
       /// Modifiers
       ///
 
       void clear() noexcept { table_.clear(); }
 
       template <class Ty>
       BOOST_FORCEINLINE auto insert(Ty&& value)
         -> decltype(table_.insert(std::forward<Ty>(value)))
       {
         return table_.insert(std::forward<Ty>(value));
       }
 
       BOOST_FORCEINLINE std::pair<iterator, bool> insert(init_type&& value)
       {
         return table_.insert(std::move(value));
       }
 
       template <class Ty>
       BOOST_FORCEINLINE auto insert(const_iterator, Ty&& value)
         -> decltype(table_.insert(std::forward<Ty>(value)).first)
       {
         return table_.insert(std::forward<Ty>(value)).first;
       }
 
       BOOST_FORCEINLINE iterator insert(const_iterator, init_type&& value)
       {
         return table_.insert(std::move(value)).first;
       }
 
       template <class InputIterator>
       BOOST_FORCEINLINE void insert(InputIterator first, InputIterator last)
       {
         for (auto pos = first; pos != last; ++pos) {
           table_.emplace(*pos);
         }
       }
 
       void insert(std::initializer_list<value_type> ilist)
       {
         this->insert(ilist.begin(), ilist.end());
       }
 
       template <class M>
       std::pair<iterator, bool> insert_or_assign(key_type const& key, M&& obj)
       {
         auto ibp = table_.try_emplace(key, std::forward<M>(obj));
         if (ibp.second) {
           return ibp;
         }
         ibp.first->second = std::forward<M>(obj);
         return ibp;
       }
 
       template <class M>
       std::pair<iterator, bool> insert_or_assign(key_type&& key, M&& obj)
       {
         auto ibp = table_.try_emplace(std::move(key), std::forward<M>(obj));
         if (ibp.second) {
           return ibp;
         }
         ibp.first->second = std::forward<M>(obj);
         return ibp;
       }
 
       template <class K, class M>
       typename std::enable_if<
         boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
         std::pair<iterator, bool> >::type
       insert_or_assign(K&& k, M&& obj)
       {
         auto ibp = table_.try_emplace(std::forward<K>(k), std::forward<M>(obj));
         if (ibp.second) {
           return ibp;
         }
         ibp.first->second = std::forward<M>(obj);
         return ibp;
       }
 
       template <class M>
       iterator insert_or_assign(const_iterator, key_type const& key, M&& obj)
       {
         return this->insert_or_assign(key, std::forward<M>(obj)).first;
       }
 
       template <class M>
       iterator insert_or_assign(const_iterator, key_type&& key, M&& obj)
       {
         return this->insert_or_assign(std::move(key), std::forward<M>(obj))
           .first;
       }
 
       template <class K, class M>
       typename std::enable_if<
         boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
         iterator>::type
       insert_or_assign(const_iterator, K&& k, M&& obj)
       {
         return this->insert_or_assign(std::forward<K>(k), std::forward<M>(obj))
           .first;
       }
 
       template <class... Args>
       BOOST_FORCEINLINE std::pair<iterator, bool> emplace(Args&&... args)
       {
         return table_.emplace(std::forward<Args>(args)...);
       }
 
       template <class... Args>
       BOOST_FORCEINLINE iterator emplace_hint(const_iterator, Args&&... args)
       {
         return table_.emplace(std::forward<Args>(args)...).first;
       }
 
       template <class... Args>
       BOOST_FORCEINLINE std::pair<iterator, bool> try_emplace(
         key_type const& key, Args&&... args)
       {
         return table_.try_emplace(key, std::forward<Args>(args)...);
       }
 
       template <class... Args>
       BOOST_FORCEINLINE std::pair<iterator, bool> try_emplace(
         key_type&& key, Args&&... args)
       {
         return table_.try_emplace(std::move(key), std::forward<Args>(args)...);
       }
 
       template <class K, class... Args>
       BOOST_FORCEINLINE typename std::enable_if<
         boost::unordered::detail::transparent_non_iterable<K,
           unordered_flat_map>::value,
         std::pair<iterator, bool> >::type
       try_emplace(K&& key, Args&&... args)
       {
         return table_.try_emplace(
           std::forward<K>(key), std::forward<Args>(args)...);
       }
 
       template <class... Args>
       BOOST_FORCEINLINE iterator try_emplace(
         const_iterator, key_type const& key, Args&&... args)
       {
         return table_.try_emplace(key, std::forward<Args>(args)...).first;
       }
 
       template <class... Args>
       BOOST_FORCEINLINE iterator try_emplace(
         const_iterator, key_type&& key, Args&&... args)
       {
         return table_.try_emplace(std::move(key), std::forward<Args>(args)...)
           .first;
       }
 
       template <class K, class... Args>
       BOOST_FORCEINLINE typename std::enable_if<
         boost::unordered::detail::transparent_non_iterable<K,
           unordered_flat_map>::value,
         iterator>::type
       try_emplace(const_iterator, K&& key, Args&&... args)
       {
         return table_
           .try_emplace(std::forward<K>(key), std::forward<Args>(args)...)
           .first;
       }
 
       BOOST_FORCEINLINE typename table_type::erase_return_type erase(
         iterator pos)
       {
         return table_.erase(pos);
       }
 
       BOOST_FORCEINLINE typename table_type::erase_return_type erase(
         const_iterator pos)
       {
         return table_.erase(pos);
       }
 
       iterator erase(const_iterator first, const_iterator last)
       {
         while (first != last) {
           this->erase(first++);
         }
         return iterator{detail::foa::const_iterator_cast_tag{}, last};
       }
 
       BOOST_FORCEINLINE size_type erase(key_type const& key)
       {
         return table_.erase(key);
       }
 
       template <class K>
       BOOST_FORCEINLINE typename std::enable_if<
         detail::transparent_non_iterable<K, unordered_flat_map>::value,
         size_type>::type
       erase(K const& key)
       {
         return table_.erase(key);
       }
 
       void swap(unordered_flat_map& rhs) noexcept(
         noexcept(std::declval<table_type&>().swap(std::declval<table_type&>())))
       {
         table_.swap(rhs.table_);
       }
 
       template <class H2, class P2>
       void merge(
         unordered_flat_map<key_type, mapped_type, H2, P2, allocator_type>&
           source)
       {
         table_.merge(source.table_);
       }
 
       template <class H2, class P2>
       void merge(
         unordered_flat_map<key_type, mapped_type, H2, P2, allocator_type>&&
           source)
       {
         table_.merge(std::move(source.table_));
       }
 
       /// Lookup
       ///
 
       mapped_type& at(key_type const& key)
       {
         auto pos = table_.find(key);
         if (pos != table_.end()) {
           return pos->second;
         }
         // TODO: someday refactor this to conditionally serialize the key and
         // include it in the error message
         //
         boost::throw_exception(
           std::out_of_range("key was not found in unordered_flat_map"));
       }
 
       mapped_type const& at(key_type const& key) const
       {
         auto pos = table_.find(key);
         if (pos != table_.end()) {
           return pos->second;
         }
         boost::throw_exception(
           std::out_of_range("key was not found in unordered_flat_map"));
       }
 
       template <class K>
       typename std::enable_if<
         boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
         mapped_type&>::type
       at(K&& key)
       {
         auto pos = table_.find(std::forward<K>(key));
         if (pos != table_.end()) {
           return pos->second;
         }
         boost::throw_exception(
           std::out_of_range("key was not found in unordered_flat_map"));
       }
 
       template <class K>
       typename std::enable_if<
         boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
         mapped_type const&>::type
       at(K&& key) const
       {
         auto pos = table_.find(std::forward<K>(key));
         if (pos != table_.end()) {
           return pos->second;
         }
         boost::throw_exception(
           std::out_of_range("key was not found in unordered_flat_map"));
       }
 
       BOOST_FORCEINLINE mapped_type& operator[](key_type const& key)
       {
         return table_.try_emplace(key).first->second;
       }
 
       BOOST_FORCEINLINE mapped_type& operator[](key_type&& key)
       {
         return table_.try_emplace(std::move(key)).first->second;
       }
 
       template <class K>
       typename std::enable_if<
         boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
         mapped_type&>::type
       operator[](K&& key)
       {
         return table_.try_emplace(std::forward<K>(key)).first->second;
       }
 
       BOOST_FORCEINLINE size_type count(key_type const& key) const
       {
         auto pos = table_.find(key);
         return pos != table_.end() ? 1 : 0;
       }
 
       template <class K>
       BOOST_FORCEINLINE typename std::enable_if<
         detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
       count(K const& key) const
       {
         auto pos = table_.find(key);
         return pos != table_.end() ? 1 : 0;
       }
 
       BOOST_FORCEINLINE iterator find(key_type const& key)
       {
         return table_.find(key);
       }
 
       BOOST_FORCEINLINE const_iterator find(key_type const& key) const
       {
         return table_.find(key);
       }
 
       template <class K>
       BOOST_FORCEINLINE typename std::enable_if<
         boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
         iterator>::type
       find(K const& key)
       {
         return table_.find(key);
       }
 
       template <class K>
       BOOST_FORCEINLINE typename std::enable_if<
         boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
         const_iterator>::type
       find(K const& key) const
       {
         return table_.find(key);
       }
 
       BOOST_FORCEINLINE bool contains(key_type const& key) const
       {
         return this->find(key) != this->end();
       }
 
       template <class K>
       BOOST_FORCEINLINE typename std::enable_if<
         boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
         bool>::type
       contains(K const& key) const
       {
         return this->find(key) != this->end();
       }
 
       std::pair<iterator, iterator> equal_range(key_type const& key)
       {
         auto pos = table_.find(key);
         if (pos == table_.end()) {
           return {pos, pos};
         }
 
         auto next = pos;
         ++next;
         return {pos, next};
       }
 
       std::pair<const_iterator, const_iterator> equal_range(
         key_type const& key) const
       {
         auto pos = table_.find(key);
         if (pos == table_.end()) {
           return {pos, pos};
         }
 
         auto next = pos;
         ++next;
         return {pos, next};
       }
 
       template <class K>
       typename std::enable_if<
         detail::are_transparent<K, hasher, key_equal>::value,
         std::pair<iterator, iterator> >::type
       equal_range(K const& key)
       {
         auto pos = table_.find(key);
         if (pos == table_.end()) {
           return {pos, pos};
         }
 
         auto next = pos;
         ++next;
         return {pos, next};
       }
 
       template <class K>
       typename std::enable_if<
         detail::are_transparent<K, hasher, key_equal>::value,
         std::pair<const_iterator, const_iterator> >::type
       equal_range(K const& key) const
       {
         auto pos = table_.find(key);
         if (pos == table_.end()) {
           return {pos, pos};
         }
 
         auto next = pos;
         ++next;
         return {pos, next};
       }
 
       /// Hash Policy
       ///
 
       size_type bucket_count() const noexcept { return table_.capacity(); }
 
       float load_factor() const noexcept { return table_.load_factor(); }
 
       float max_load_factor() const noexcept
       {
         return table_.max_load_factor();
       }
 
       void max_load_factor(float) {}
 
       size_type max_load() const noexcept { return table_.max_load(); }
 
       void rehash(size_type n) { table_.rehash(n); }
 
       void reserve(size_type n) { table_.reserve(n); }
 
       /// Observers
       ///
 
       hasher hash_function() const { return table_.hash_function(); }
 
       key_equal key_eq() const { return table_.key_eq(); }
     };
 
     template <class Key, class T, class Hash, class KeyEqual, class Allocator>
     bool operator==(
       unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
       unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
     {
       return lhs.table_ == rhs.table_;
     }
 
     template <class Key, class T, class Hash, class KeyEqual, class Allocator>
     bool operator!=(
       unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
       unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
     {
       return !(lhs == rhs);
     }
 
     template <class Key, class T, class Hash, class KeyEqual, class Allocator>
     void swap(unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& lhs,
       unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& rhs)
       noexcept(noexcept(lhs.swap(rhs)))
     {
       lhs.swap(rhs);
     }
 
     template <class Key, class T, class Hash, class KeyEqual, class Allocator,
       class Pred>
     typename unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>::size_type
     erase_if(
       unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& map, Pred pred)
     {
       return erase_if(map.table_, pred);
     }
 
     template <class Archive, class Key, class T, class Hash, class KeyEqual,
       class Allocator>
     void serialize(Archive& ar,
       unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& map,
       unsigned int version)
     {
       detail::serialize_container(ar, map, version);
     }
 
 #if defined(BOOST_MSVC)
 #pragma warning(pop) /* C4714 */
 #endif
 
 #if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
 
     template <class InputIterator,
       class Hash =
         boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
       class Pred =
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
       class Allocator = std::allocator<
         boost::unordered::detail::iter_to_alloc_t<InputIterator> >,
       class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
       class = std::enable_if_t<detail::is_pred_v<Pred> >,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(InputIterator, InputIterator,
       std::size_t = boost::unordered::detail::foa::default_bucket_count,
       Hash = Hash(), Pred = Pred(), Allocator = Allocator())
       -> unordered_flat_map<boost::unordered::detail::iter_key_t<InputIterator>,
         boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
         Allocator>;
 
     template <class Key, class T,
       class Hash = boost::hash<std::remove_const_t<Key> >,
       class Pred = std::equal_to<std::remove_const_t<Key> >,
       class Allocator = std::allocator<std::pair<const Key, T> >,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
       class = std::enable_if_t<detail::is_pred_v<Pred> >,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(std::initializer_list<std::pair<Key, T> >,
       std::size_t = boost::unordered::detail::foa::default_bucket_count,
       Hash = Hash(), Pred = Pred(), Allocator = Allocator())
       -> unordered_flat_map<std::remove_const_t<Key>, T, Hash, Pred,
         Allocator>;
 
     template <class InputIterator, class Allocator,
       class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(InputIterator, InputIterator, std::size_t, Allocator)
       -> unordered_flat_map<boost::unordered::detail::iter_key_t<InputIterator>,
         boost::unordered::detail::iter_val_t<InputIterator>,
         boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
     template <class InputIterator, class Allocator,
       class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(InputIterator, InputIterator, Allocator)
       -> unordered_flat_map<boost::unordered::detail::iter_key_t<InputIterator>,
         boost::unordered::detail::iter_val_t<InputIterator>,
         boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
     template <class InputIterator, class Hash, class Allocator,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
       class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(
       InputIterator, InputIterator, std::size_t, Hash, Allocator)
       -> unordered_flat_map<boost::unordered::detail::iter_key_t<InputIterator>,
         boost::unordered::detail::iter_val_t<InputIterator>, Hash,
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
     template <class Key, class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
       Allocator) -> unordered_flat_map<std::remove_const_t<Key>, T,
       boost::hash<std::remove_const_t<Key> >,
       std::equal_to<std::remove_const_t<Key> >, Allocator>;
 
     template <class Key, class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(std::initializer_list<std::pair<Key, T> >, Allocator)
       -> unordered_flat_map<std::remove_const_t<Key>, T,
         boost::hash<std::remove_const_t<Key> >,
         std::equal_to<std::remove_const_t<Key> >, Allocator>;
 
     template <class Key, class T, class Hash, class Allocator,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
       Hash, Allocator) -> unordered_flat_map<std::remove_const_t<Key>, T,
       Hash, std::equal_to<std::remove_const_t<Key> >, Allocator>;
 #endif
 
   } // namespace unordered
 } // namespace boost
 
 #endif

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