namespace boost {
  namespace container {
    template<typename T, std::size_t NodesPerBlock = ADP_nodes_per_block, 
             std::size_t MaxFreeBlocks = ADP_max_free_blocks, 
             std::size_t OverheadPercent = ADP_overhead_percent> 
      class adaptive_pool;
  }
}

namespace boost {
  namespace container {
    template<typename T, unsigned Version = 2, 
             unsigned int AllocationDisableMask = 0> 
      class allocator;
  }
}

namespace boost {
  namespace container {
    template<typename Allocator> struct allocator_traits;
  }
}

Этот файл заголовка вперед объявляет следующие контейнеры:

Форвард объявляет следующие распределители:

Forward объявляет следующие классы полиморфных ресурсов:

И, наконец, он определяет следующие типы

namespace boost {
  namespace container {
    struct ordered_range_t;
    struct ordered_unique_range_t;
    struct default_init_t;
    enum tree_type_enum;
    typedef implementation_defined tree_assoc_defaults;
    static const ordered_range_t ordered_range;
    static const ordered_unique_range_t ordered_unique_range;
    static const default_init_t default_init;
  }
}

namespace boost {
  namespace container {
    template<typename T, typename Allocator = new_allocator<T> > class deque;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename T> struct deque_of;
      typedef boost::container::deque< T, polymorphic_allocator< T >> deque;
    }
  }
}

namespace boost {
  namespace container {
    template<typename Key, typename T, typename Compare = std::less<Key>, 
             typename Allocator = new_allocator< std::pair< Key, T> > > 
      class flat_map;
    template<typename Key, typename T, typename Compare = std::less<Key>, 
             typename Allocator = new_allocator< std::pair< Key, T> > > 
      class flat_multimap;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename Key, typename T, typename Compare = std::less<Key>, 
               typename Options = tree_assoc_defaults> 
        struct flat_map_of;
      template<typename Key, typename T, typename Compare = std::less<Key>, 
               typename Options = tree_assoc_defaults> 
        struct flat_multimap_of;
      typedef boost::container::flat_map< Key, T, Compare, polymorphic_allocator< std::pair< Key, T > > > flat_map;
      typedef boost::container::flat_multimap< Key, T, Compare, polymorphic_allocator< std::pair< Key, T > > > flat_multimap;
    }
  }
}

namespace boost {
  namespace container {
    template<typename Key, typename Compare = std::less<Key>, 
             typename Allocator = new_allocator<Key> > 
      class flat_set;
    template<typename Key, typename Compare = std::less<Key>, 
             typename Allocator = new_allocator<Key> > 
      class flat_multiset;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename Key, typename Compare = std::less<Key>, 
               typename Options = tree_assoc_defaults> 
        struct flat_set_of;
      template<typename Key, typename Compare = std::less<Key>, 
               typename Options = tree_assoc_defaults> 
        struct flat_multiset_of;
      typedef boost::container::flat_set< Key, Compare, polymorphic_allocator< Key > > flat_set;
      typedef boost::container::flat_multiset< Key, Compare, polymorphic_allocator< Key > > flat_multiset;
    }
  }
}

namespace boost {
  namespace container {
    template<typename T, typename Allocator = new_allocator<T> > class list;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename T> struct list_of;
      typedef boost::container::list< T, polymorphic_allocator< T >> list;
    }
  }
}

namespace boost {
  namespace container {
    template<typename Key, typename T, typename Compare = std::less<Key>, 
             typename Allocator = new_allocator< std::pair< const Key, T> >, 
             typename Options = tree_assoc_defaults> 
      class map;
    template<typename Key, typename T, typename Compare = std::less<Key>, 
             typename Allocator = new_allocator< std::pair< const Key, T> >, 
             typename Options = tree_assoc_defaults> 
      class multimap;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename Key, typename T, typename Compare = std::less<Key>, 
               typename Options = tree_assoc_defaults> 
        struct map_of;
      template<typename Key, typename T, typename Compare = std::less<Key>, 
               typename Options = tree_assoc_defaults> 
        struct multimap_of;
      typedef boost::container::map< Key, T, Compare, polymorphic_allocator< std::pair< const Key, T > >, Options > map;
      typedef boost::container::multimap< Key, T, Compare, polymorphic_allocator< std::pair< const Key, T > >, Options > multimap;
    }
  }
}

namespace boost {
  namespace container {
    template<> class new_allocator<void>;
    template<typename T> class new_allocator;
  }
}

namespace boost {
  namespace container {
    template<typename T, 
             std::size_t NodesPerBlock = NodeAlloc_nodes_per_block> 
      class node_allocator;
  }
}

namespace boost {
  namespace container {
    template<typename NodeType, typename Value, typename Allocator, 
             typename KeyMapped = void> 
      class node_handle;
    template<typename Iterator, typename NodeType> 
      struct insert_return_type_base;
  }
}

namespace boost {
  namespace container {
    template<tree_type_enum TreeType> struct tree_type;
    template<bool Enabled> struct optimize_size;
    template<class... Options> struct tree_assoc_options;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      memory_resource * new_delete_resource();
      memory_resource * null_memory_resource();
      memory_resource * set_default_resource(memory_resource *);
      memory_resource * get_default_resource();
    }
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      class memory_resource;
    }
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      class monotonic_buffer_resource;
    }
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename T> class polymorphic_allocator;
      template<typename T1, typename T2> 
        bool operator==(const polymorphic_allocator< T1 > &, 
                        const polymorphic_allocator< T2 > &);
      template<typename T1, typename T2> 
        bool operator!=(const polymorphic_allocator< T1 > &, 
                        const polymorphic_allocator< T2 > &);
    }
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      struct pool_options;
    }
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename Allocator> class resource_adaptor_imp;
      typedef resource_adaptor_imp< typename allocator_traits< Allocator >::template rebind_alloc< char > > resource_adaptor;
    }
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      class synchronized_pool_resource;
    }
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      class unsynchronized_pool_resource;
    }
  }
}

namespace boost {
  namespace container {
    template<typename OuterAlloc, typename... InnerAllocs> 
      class scoped_allocator_adaptor;
    template<typename OuterA1, typename OuterA2, 
             BOOST_CONTAINER_SCOPEDALLOC_ALLINNERCLASS > 
      bool operator==(const scoped_allocator_adaptor< OuterA1, InnerAllocs...> & a, 
                      const scoped_allocator_adaptor< OuterA2, InnerAllocs...> & b);
    template<typename OuterA1, typename OuterA2, 
             BOOST_CONTAINER_SCOPEDALLOC_ALLINNERCLASS > 
      bool operator!=(const scoped_allocator_adaptor< OuterA1, InnerAllocs...> & a, 
                      const scoped_allocator_adaptor< OuterA2, InnerAllocs...> & b);
  }
}

Этот файл заголовка вперед объявляетboost::container::scoped_allocator_adaptor

namespace boost {
  namespace container {
    template<typename Key, typename Compare = std::less<Key>, 
             typename Allocator = new_allocator<Key>, 
             typename Options = tree_assoc_defaults> 
      class set;
    template<typename Key, typename Compare = std::less<Key>, 
             typename Allocator = new_allocator<Key>, 
             typename Options = tree_assoc_defaults> 
      class multiset;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename Key, typename Compare = std::less<Key>, 
               typename Options = tree_assoc_defaults> 
        struct set_of;
      template<typename Key, typename Compare = std::less<Key>, 
               typename Options = tree_assoc_defaults> 
        struct multiset_of;
      typedef boost::container::set< Key, Compare, polymorphic_allocator< Key >, Options > set;
      typedef boost::container::multiset< Key, Compare, polymorphic_allocator< Key >, Options > multiset;
    }
  }
}

namespace boost {
  namespace container {
    template<typename T, typename Allocator = new_allocator<T> > class slist;
  }
}namespace std {
  template<typename T, typename Allocator> 
    class insert_iterator<boost::container::slist< T, Allocator >>;
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename T> struct slist_of;
      typedef boost::container::slist< T, polymorphic_allocator< T >> slist;
    }
  }
}

namespace boost {
  namespace container {
    template<typename Allocator> class small_vector_allocator;
    template<typename T, typename SecondaryAllocator> class small_vector_base;
    template<typename T, std::size_t N, 
             typename Allocator = new_allocator<T> > 
      class small_vector;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename T, std::size_t N> struct small_vector_of;
      typedef boost::container::small_vector< T, N, polymorphic_allocator< T >> small_vector;
    }
  }
}

namespace boost {
  namespace container {
    template<typename T, typename Allocator = new_allocator<T> > 
      class stable_vector;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename T> struct stable_vector_of;
      typedef boost::container::stable_vector< T, polymorphic_allocator< T >> stable_vector;
    }
  }
}

namespace boost {
  namespace container {
    template<typename Value, std::size_t Capacity> class static_vector;
    template<typename V, std::size_t C1, std::size_t C2> 
      bool operator==(static_vector< V, C1 > const &, 
                      static_vector< V, C2 > const &);
    template<typename V, std::size_t C1, std::size_t C2> 
      bool operator!=(static_vector< V, C1 > const &, 
                      static_vector< V, C2 > const &);
    template<typename V, std::size_t C1, std::size_t C2> 
      bool operator<(static_vector< V, C1 > const &, 
                     static_vector< V, C2 > const &);
    template<typename V, std::size_t C1, std::size_t C2> 
      bool operator>(static_vector< V, C1 > const &, 
                     static_vector< V, C2 > const &);
    template<typename V, std::size_t C1, std::size_t C2> 
      bool operator<=(static_vector< V, C1 > const &, 
                      static_vector< V, C2 > const &);
    template<typename V, std::size_t C1, std::size_t C2> 
      bool operator>=(static_vector< V, C1 > const &, 
                      static_vector< V, C2 > const &);
    template<typename V, std::size_t C1, std::size_t C2> 
      void swap(static_vector< V, C1 > &, static_vector< V, C2 > &);
  }
}

namespace boost {
  namespace container {
    template<typename CharT, typename Traits = std::char_traits<CharT>, 
             typename Allocator = new_allocator<CharT> > 
      class basic_string;
    typedef basic_string< char,std::char_traits< char >,new_allocator< char > > string;
    typedef basic_string< wchar_t,std::char_traits< wchar_t >,new_allocator< wchar_t > > wstring;
    template<typename CharT, typename Traits, typename Allocator> 
      basic_string< CharT, Traits, Allocator > 
      operator+(const basic_string< CharT, Traits, Allocator > & x, 
                const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      basic_string< CharT, Traits, Allocator > 
      operator+(basic_string< CharT, Traits, Allocator > && x, 
                basic_string< CharT, Traits, Allocator > && y);
    template<typename CharT, typename Traits, typename Allocator> 
      basic_string< CharT, Traits, Allocator > 
      operator+(basic_string< CharT, Traits, Allocator > && x, 
                const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      basic_string< CharT, Traits, Allocator > 
      operator+(const basic_string< CharT, Traits, Allocator > & x, 
                basic_string< CharT, Traits, Allocator > && y);
    template<typename CharT, typename Traits, typename Allocator> 
      basic_string< CharT, Traits, Allocator > 
      operator+(const CharT * s, basic_string< CharT, Traits, Allocator > y);
    template<typename CharT, typename Traits, typename Allocator> 
      basic_string< CharT, Traits, Allocator > 
      operator+(basic_string< CharT, Traits, Allocator > x, const CharT * s);
    template<typename CharT, typename Traits, typename Allocator> 
      basic_string< CharT, Traits, Allocator > 
      operator+(CharT c, basic_string< CharT, Traits, Allocator > y);
    template<typename CharT, typename Traits, typename Allocator> 
      basic_string< CharT, Traits, Allocator > 
      operator+(basic_string< CharT, Traits, Allocator > x, const CharT c);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator==(const basic_string< CharT, Traits, Allocator > & x, 
                      const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator==(const CharT * s, 
                      const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator==(const basic_string< CharT, Traits, Allocator > & x, 
                      const CharT * s);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator!=(const basic_string< CharT, Traits, Allocator > & x, 
                      const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator!=(const CharT * s, 
                      const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator!=(const basic_string< CharT, Traits, Allocator > & x, 
                      const CharT * s);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator<(const basic_string< CharT, Traits, Allocator > & x, 
                     const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator<(const CharT * s, 
                     const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator<(const basic_string< CharT, Traits, Allocator > & x, 
                     const CharT * s);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator>(const basic_string< CharT, Traits, Allocator > & x, 
                     const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator>(const CharT * s, 
                     const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator>(const basic_string< CharT, Traits, Allocator > & x, 
                     const CharT * s);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator<=(const basic_string< CharT, Traits, Allocator > & x, 
                      const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator<=(const CharT * s, 
                      const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator<=(const basic_string< CharT, Traits, Allocator > & x, 
                      const CharT * s);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator>=(const basic_string< CharT, Traits, Allocator > & x, 
                      const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator>=(const CharT * s, 
                      const basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      bool operator>=(const basic_string< CharT, Traits, Allocator > & x, 
                      const CharT * s);
    template<typename CharT, typename Traits, typename Allocator> 
      void swap(basic_string< CharT, Traits, Allocator > & x, 
                basic_string< CharT, Traits, Allocator > & y);
    template<typename CharT, typename Traits, typename Allocator> 
      std::basic_ostream< CharT, Traits > & 
      operator<<(std::basic_ostream< CharT, Traits > & os, 
                 const basic_string< CharT, Traits, Allocator > & s);
    template<typename CharT, typename Traits, typename Allocator> 
      std::basic_istream< CharT, Traits > & 
      operator>>(std::basic_istream< CharT, Traits > & is, 
                 basic_string< CharT, Traits, Allocator > & s);
    template<typename CharT, typename Traits, typename Allocator> 
      std::basic_istream< CharT, Traits > & 
      getline(std::istream & is, basic_string< CharT, Traits, Allocator > & s, 
              CharT delim);
    template<typename CharT, typename Traits, typename Allocator> 
      std::basic_istream< CharT, Traits > & 
      getline(std::basic_istream< CharT, Traits > & is, 
              basic_string< CharT, Traits, Allocator > & s);
    template<typename Ch, typename Allocator> 
      std::size_t hash_value(basic_string< Ch, std::char_traits< Ch >, Allocator > const & v);
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename CharT, typename Traits = std::char_traits<CharT> > 
        struct basic_string_of;
      typedef boost::container::basic_string< CharT, Traits, polymorphic_allocator< CharT > > basic_string;
      typedef basic_string_of< char >::type string;
      typedef basic_string_of< wchar_t >::type wstring;
    }
  }
}

namespace boost {
  namespace container {
    void throw_bad_alloc();
    void throw_out_of_range(const char *);
    void throw_length_error(const char *);
    void throw_logic_error(const char *);
    void throw_runtime_error(const char *);
  }
}

namespace boost {
  namespace container {
    template<typename T> struct constructible_with_allocator_suffix;
    template<typename T> struct constructible_with_allocator_prefix;
    template<typename T, typename Allocator> struct uses_allocator;
  }
}

Этот заголовок вперед заявляет:boost::container::constructible_with_allocator_prefix,boost::container::constructible_with_allocator_suffixиboost::container::uses_allocator. Также определяются следующие виды:

namespace boost {
  namespace container {
    struct erased_type;
    typedef unspecified allocator_arg_t;
    static allocator_arg_t allocator_arg;
  }
}

namespace boost {
  namespace container {
    template<typename T, typename Allocator = new_allocator<T> > class vector;
  }
}

namespace boost {
  namespace container {
    namespace pmr {
      template<typename T> struct vector_of;
      typedef boost::container::vector< T, polymorphic_allocator< T >> vector;
    }
  }
}