namespace boost {
  namespace intrusive {
    template<class ... Options> class any_base_hook;
    template<class ... Options> class any_member_hook;

    template<typename BasicHook> struct any_to_avl_set_hook;
    template<typename BasicHook> struct any_to_bs_set_hook;
    template<typename BasicHook> struct any_to_list_hook;
    template<typename BasicHook> struct any_to_set_hook;
    template<typename BasicHook> struct any_to_slist_hook;
    template<typename BasicHook> struct any_to_unordered_set_hook;
    template<class ... Options> struct make_any_base_hook;
    template<class ... Options> struct make_any_member_hook;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> class avl_multiset;
    template<typename T, class ... Options> class avl_set;

    template<typename T, class ... Options> struct make_avl_multiset;
    template<typename T, class ... Options> struct make_avl_set;
    template<typename T, class ... Options> 
      bool operator!=(const avl_set< T, Options... > & x, 
                      const avl_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const avl_set< T, Options... > & x, 
                     const avl_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const avl_set< T, Options... > & x, 
                      const avl_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const avl_set< T, Options... > & x, 
                      const avl_set< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(avl_set< T, Options... > & x, avl_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator!=(const avl_multiset< T, Options... > & x, 
                      const avl_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const avl_multiset< T, Options... > & x, 
                     const avl_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const avl_multiset< T, Options... > & x, 
                      const avl_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const avl_multiset< T, Options... > & x, 
                      const avl_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(avl_multiset< T, Options... > & x, 
                avl_multiset< T, Options... > & y);
  }
}

namespace boost {
  namespace intrusive {
    template<class ... Options> class avl_set_base_hook;
    template<class ... Options> class avl_set_member_hook;

    template<class ... Options> struct make_avl_set_base_hook;
    template<class ... Options> struct make_avl_set_member_hook;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> class avltree;

    template<typename T, class ... Options> struct make_avltree;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class avltree_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> class bs_multiset;
    template<typename T, class ... Options> class bs_set;

    template<typename T, class ... Options> struct make_bs_multiset;
    template<typename T, class ... Options> struct make_bs_set;
    template<typename T, class ... Options> 
      bool operator!=(const bs_set< T, Options... > & x, 
                      const bs_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const bs_set< T, Options... > & x, 
                     const bs_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const bs_set< T, Options... > & x, 
                      const bs_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const bs_set< T, Options... > & x, 
                      const bs_set< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(bs_set< T, Options... > & x, bs_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator!=(const bs_multiset< T, Options... > & x, 
                      const bs_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const bs_multiset< T, Options... > & x, 
                     const bs_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const bs_multiset< T, Options... > & x, 
                      const bs_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const bs_multiset< T, Options... > & x, 
                      const bs_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(bs_multiset< T, Options... > & x, 
                bs_multiset< T, Options... > & y);
  }
}

namespace boost {
  namespace intrusive {
    template<class ... Options> class bs_set_base_hook;
    template<class ... Options> class bs_set_member_hook;

    template<class ... Options> struct make_bs_set_base_hook;
    template<class ... Options> struct make_bs_set_member_hook;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> class bstree;

    template<typename T, class ... Options> struct make_bstree;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class bstree_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class circular_list_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class circular_slist_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, typename NodeTraits, 
             link_mode_type LinkMode = safe_link> 
      struct derivation_value_traits;
  }
}

namespace boost {
  namespace intrusive {
    template<typename ValueTraits, typename VoidOrKeyOfValue, 
             typename VoidOrKeyHash, typename VoidOrKeyEqual, 
             typename BucketTraits, bool LinearBuckets, bool > 
      struct bucket_hash_equal_t;

    template<typename ValueTraits, typename VoidOrKeyOfValue, 
             typename VoidOrKeyHash, typename VoidOrKeyEqual, 
             typename BucketTraits, bool LinearBuckets> 
      struct bucket_hash_equal_t<ValueTraits, VoidOrKeyOfValue, VoidOrKeyHash, VoidOrKeyEqual, BucketTraits, LinearBuckets, true>;

    template<typename ValueTraits, typename VoidOrKeyOfValue, 
             typename VoidOrKeyHash, typename BucketTraits, 
             bool LinearBuckets> 
      struct bucket_hash_t;
    template<typename ValueTraits, typename BucketTraits, bool LinearBuckets> 
      struct bucket_plus_vtraits;
    template<typename BucketPtr, typename SizeType> struct bucket_traits_impl;
    struct default_hashtable_hook_applier;
    template<typename ValueTraits, bool IsConst> 
      struct downcast_node_to_value_t;

    template<typename Bucket, typename Algo, typename Disposer, 
             typename SizeType> 
      class exception_bucket_disposer;

    template<typename EqualTo, typename > struct get_equal_to;

    template<typename T> struct get_equal_to<void, T>;

    template<typename Hash, typename > struct get_hash;

    template<typename T> struct get_hash<void, T>;

    template<typename KeyOfValue, typename T> struct get_hash_key_of_value;

    template<typename T> struct get_hash_key_of_value<void, T>;

    template<typename ValueTraits, typename VoidOrKeyOfValue, 
             typename VoidOrKeyHash, typename VoidOrKeyEqual, 
             typename BucketTraits, typename SizeType, std::size_t BoolFlags> 
      struct get_hashtable_size_wrapper_bucket;
    template<typename ValueTraits, typename VoidOrKeyOfValue, 
             typename VoidOrKeyHash, typename VoidOrKeyEqual, 
             typename BucketTraits, typename SizeType, std::size_t BoolFlags> 
      struct get_hashtable_size_wrapper_internal;
    template<typename NodeTraits> struct group_functions;
    struct hash_bool_flags;
    template<typename T, typename VoidOrKeyOfValue, typename VoidOrKeyEqual> 
      struct hash_key_equal;
    template<typename T, typename VoidOrKeyOfValue, typename VoidOrKeyHash> 
      struct hash_key_hash;
    template<typename T, typename VoidOrKeyOfValue> struct hash_key_types_base;
    template<typename ValueTraits, typename VoidOrKeyOfValue, 
             typename VoidOrKeyHash, typename VoidOrKeyEqual, 
             typename BucketTraits, typename SizeType, std::size_t BoolFlags> 
      struct hashdata_internal;

    template<typename T, class ... Options> class hashtable;

    struct hashtable_defaults;
    template<typename ValueTraits, typename BucketTraits, 
             typename VoidOrKeyOfValue, typename VoidOrKeyEqual, 
             bool LinearBuckets> 
      struct hashtable_equal_holder;
    template<typename DeriveFrom, typename SizeType, bool > 
      struct hashtable_size_wrapper;

    template<typename DeriveFrom, typename SizeType> 
      struct hashtable_size_wrapper<DeriveFrom, SizeType, false>;

    template<typename BucketType, typename SplitTraits, 
             typename SlistNodeAlgorithms> 
      class incremental_rehash_rollback;

    template<bool StoreHash> struct insert_commit_data_impl;

    template<> struct insert_commit_data_impl<false>;
    template<> struct is_default_hook_tag<default_hashtable_hook_applier>;

    template<typename T, class ... Options> struct make_hashtable;
    template<typename F, typename SlistNodePtr, typename NodePtr> 
      struct node_cast_adaptor;
    template<typename NodeTraits> struct node_functions;
    template<typename T> struct optimize_multikey_is_true;
    template<typename T> struct store_hash_is_true;
    template<typename ValueTraitsOrHookOption> struct unordered_bucket;
    template<typename SupposedValueTraits> struct unordered_bucket_impl;
    template<typename ValueTraitsOrHookOption> struct unordered_bucket_ptr;
    template<typename SupposedValueTraits> struct unordered_bucket_ptr_impl;
    template<typename ValueTraitsOrHookOption> 
      struct unordered_default_bucket_traits;
    template<typename InputIt, typename T> 
      InputIt priv_algo_find(InputIt first, InputIt last, const T & value);
    template<typename InputIt, typename T> 
      boost::intrusive::iterator_traits< InputIt >::difference_type 
      priv_algo_count(InputIt first, InputIt last, const T & value);
    template<typename ForwardIterator1, typename ForwardIterator2> 
      bool priv_algo_is_permutation(ForwardIterator1 first1, 
                                    ForwardIterator1 last1, 
                                    ForwardIterator2 first2);
    template<typename Node, typename SlistNodePtr> 
      pointer_traits< SlistNodePtr >::template rebind_pointer< Node >::type 
      dcast_bucket_ptr(const SlistNodePtr & p);
    std::size_t hash_to_bucket(std::size_t hash_value, std::size_t bucket_cnt, 
                               unspecified);
    std::size_t hash_to_bucket(std::size_t hash_value, std::size_t bucket_cnt, 
                               unspecified);

    // fastmod_buckets
    template<bool Power2Buckets, bool Incremental> 
      std::size_t hash_to_bucket_split(std::size_t hash_value, 
                                       std::size_t bucket_cnt, 
                                       std::size_t split, unspecified);
    template<bool Power2Buckets, bool Incremental> 
      std::size_t hash_to_bucket_split(std::size_t hash_value, std::size_t, 
                                       std::size_t split, unspecified);
  }
}

This header file forward declares most Intrusive classes.

It forward declares the following containers and hooks:

It forward declares the following container or hook options:

It forward declares the following value traits utilities:

Finally it forward declares the following general purpose utilities:

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class linear_slist_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    enum link_mode_type;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> class list;

    template<typename T, class ... Options> struct make_list;
  }
}

namespace boost {
  namespace intrusive {
    template<class ... Options> class list_base_hook;
    template<class ... Options> class list_member_hook;

    template<class ... Options> struct make_list_base_hook;
    template<class ... Options> struct make_list_member_hook;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, typename NodeTraits, 
             typename NodeTraits::node T::* PtrToMember, 
             link_mode_type LinkMode = safe_link> 
      struct member_value_traits;
  }
}

namespace boost {
  namespace intrusive {
    template<typename BaseHook> struct base_hook;
    template<typename BucketTraits> struct bucket_traits;
    template<bool Enabled> struct cache_begin;
    template<bool Enabled> struct cache_last;
    template<typename Compare> struct compare;
    template<bool Enabled> struct compare_hash;
    template<bool Enabled> struct constant_time_size;
    template<typename Equal> struct equal;
    template<bool Enabled> struct fastmod_buckets;
    template<bool Enabled> struct floating_point;
    template<typename Functor> struct function_hook;
    template<typename Hash> struct hash;
    template<typename HeaderHolder> struct header_holder_type;
    template<bool Enabled> struct incremental;
    template<typename KeyOfValue> struct key_of_value;
    template<bool Enabled> struct linear;
    template<bool Enabled> struct linear_buckets;
    template<link_mode_type LinkType> struct link_mode;
    template<typename Parent, typename MemberHook, 
             MemberHook Parent::* PtrToMember> 
      struct member_hook;
    template<bool Enabled> struct optimize_multikey;
    template<bool Enabled> struct optimize_size;
    template<bool Enabled> struct power_2_buckets;
    template<typename Priority> struct priority;
    template<typename PrioOfValue> struct priority_of_value;
    template<typename SizeType> struct size_type;
    template<bool Enabled> struct store_hash;
    template<typename Tag> struct tag;
    template<typename ValueTraits> struct value_traits;
    template<typename VoidPointer> struct void_pointer;
  }
}

BOOST_INTRUSIVE_OPTION_TYPE(OPTION_NAME, TYPE, TYPEDEF_EXPR, TYPEDEF_NAME)
BOOST_INTRUSIVE_OPTION_CONSTANT(OPTION_NAME, TYPE, VALUE, CONSTANT_NAME)

namespace boost {
  namespace intrusive {
    template<typename DefaultOptions, class ... Options> struct pack_options;
  }
}

namespace boost {
  namespace intrusive {
    template<typename Parent, typename Member> 
      Parent * get_parent_from_member(Member *, const Member Parent::*);
    template<typename Parent, typename Member> 
      const Parent * 
      get_parent_from_member(const Member *, const Member Parent::*);
  }
}

namespace boost {
  namespace intrusive {
    template<typename VoidPointer, std::size_t Alignment> 
      struct max_pointer_plus_bits;

    template<std::size_t Alignment> 
      struct max_pointer_plus_bits<void *, Alignment>;

    template<typename Pointer, std::size_t NumBits> struct pointer_plus_bits;

    template<typename T, std::size_t NumBits> 
      struct pointer_plus_bits<T *, NumBits>;
  }
}

namespace boost {
  namespace intrusive {
    template<typename Ptr, typename U> struct pointer_has_rebind;
    template<typename Ptr, typename U> struct pointer_has_rebind_other;
    template<typename Ptr, typename U> struct pointer_rebind;

    template<typename T, typename U> struct pointer_rebind<T *, U>;

    template<typename Ptr, typename U> struct pointer_rebind_mode;
    template<typename Ptr, typename U, unsigned int RebindMode> 
      struct pointer_rebinder;

    template<typename Ptr, typename U> struct pointer_rebinder<Ptr, U, 1u>;
    template<typename Ptr, typename U> struct pointer_rebinder<Ptr, U, 2u>;
    template<template< class > class Ptr, typename A, typename U> 
      struct pointer_rebinder<Ptr< A >, U, 0u>;
    template<template< class, class... > class Ptr, typename A, class... An, 
             typename U> 
      struct pointer_rebinder<Ptr< A, An... >, U, 0u>;
  }
}

namespace boost {
  namespace intrusive {
    template<typename Ptr> struct pointer_traits;

    template<typename T> struct pointer_traits<T *>;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T = void> struct priority_compare;

    template<> struct priority_compare<void>;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_rbtree;

    template<typename T, class ... Options> class rbtree;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class rbtree_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_multiset;
    template<typename T, class ... Options> struct make_set;

    template<typename T, class ... Options> class multiset;
    template<typename T, class ... Options> class set;
    template<typename T, class ... Options> 
      bool operator!=(const set< T, Options... > & x, 
                      const set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const set< T, Options... > & x, 
                     const set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const set< T, Options... > & x, 
                      const set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const set< T, Options... > & x, 
                      const set< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(set< T, Options... > & x, set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator!=(const multiset< T, Options... > & x, 
                      const multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const multiset< T, Options... > & x, 
                     const multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const multiset< T, Options... > & x, 
                      const multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const multiset< T, Options... > & x, 
                      const multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(multiset< T, Options... > & x, multiset< T, Options... > & y);
  }
}

namespace boost {
  namespace intrusive {
    template<class ... Options> struct make_set_base_hook;
    template<class ... Options> struct make_set_member_hook;

    template<class ... Options> class set_base_hook;
    template<class ... Options> class set_member_hook;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_sg_multiset;
    template<typename T, class ... Options> struct make_sg_set;

    template<typename T, class ... Options> class sg_multiset;
    template<typename T, class ... Options> class sg_set;
    template<typename T, class ... Options> 
      bool operator!=(const sg_set< T, Options... > & x, 
                      const sg_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const sg_set< T, Options... > & x, 
                     const sg_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const sg_set< T, Options... > & x, 
                      const sg_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const sg_set< T, Options... > & x, 
                      const sg_set< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(sg_set< T, Options... > & x, sg_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator!=(const sg_multiset< T, Options... > & x, 
                      const sg_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const sg_multiset< T, Options... > & x, 
                     const sg_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const sg_multiset< T, Options... > & x, 
                      const sg_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const sg_multiset< T, Options... > & x, 
                      const sg_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(sg_multiset< T, Options... > & x, 
                sg_multiset< T, Options... > & y);
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_sgtree;

    template<typename T, class ... Options> class sgtree;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class sgtree_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_slist;

    template<typename T, class ... Options> class slist;
  }
}

namespace boost {
  namespace intrusive {
    template<class ... Options> struct make_slist_base_hook;
    template<class ... Options> struct make_slist_member_hook;

    template<class ... Options> class slist_base_hook;
    template<class ... Options> class slist_member_hook;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_splay_multiset;
    template<typename T, class ... Options> struct make_splay_set;

    template<typename T, class ... Options> class splay_multiset;
    template<typename T, class ... Options> class splay_set;
    template<typename T, class ... Options> 
      bool operator!=(const splay_set< T, Options... > & x, 
                      const splay_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const splay_set< T, Options... > & x, 
                     const splay_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const splay_set< T, Options... > & x, 
                      const splay_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const splay_set< T, Options... > & x, 
                      const splay_set< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(splay_set< T, Options... > & x, 
                splay_set< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator!=(const splay_multiset< T, Options... > & x, 
                      const splay_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>(const splay_multiset< T, Options... > & x, 
                     const splay_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator<=(const splay_multiset< T, Options... > & x, 
                      const splay_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      bool operator>=(const splay_multiset< T, Options... > & x, 
                      const splay_multiset< T, Options... > & y);
    template<typename T, class ... Options> 
      void swap(splay_multiset< T, Options... > & x, 
                splay_multiset< T, Options... > & y);
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_splaytree;

    template<typename T, class ... Options> class splaytree;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class splaytree_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_treap;

    template<typename T, class ... Options> class treap;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits> class treap_algorithms;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_treap_multiset;
    template<typename T, class ... Options> struct make_treap_set;

    template<typename T, class ... Options> class treap_multiset;
    template<typename T, class ... Options> class treap_set;
  }
}

namespace boost {
  namespace intrusive {
    template<typename NodeTraits, link_mode_type LinkMode = safe_link> 
      struct trivial_value_traits;
  }
}

namespace boost {
  namespace intrusive {
    template<typename T, class ... Options> struct make_unordered_multiset;
    template<typename T, class ... Options> struct make_unordered_set;

    template<typename T, class ... Options> class unordered_multiset;
    template<typename T, class ... Options> class unordered_set;
  }
}

namespace boost {
  namespace intrusive {
    template<class ... Options> struct make_unordered_set_base_hook;
    template<class ... Options> struct make_unordered_set_member_hook;

    template<class ... Options> class unordered_set_base_hook;
    template<class ... Options> class unordered_set_member_hook;
  }
}