Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for an old version of boost. Click here for the latest Boost documentation.
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Reference

Header <boost/unordered_set.hpp>
Header <boost/unordered_map.hpp>
namespace boost {
  template<typename Value, typename Hash = boost::hash<Value>, 
           typename Pred = std::equal_to<Value>, 
           typename Alloc = std::allocator<Value> > 
    class unordered_set;
  template<typename Value, typename Hash, typename Pred, typename Alloc> 
    bool operator==(unordered_set<Value, Hash, Pred, Alloc> const&, 
                    unordered_set<Value, Hash, Pred, Alloc> const&);
  template<typename Value, typename Hash, typename Pred, typename Alloc> 
    bool operator!=(unordered_set<Value, Hash, Pred, Alloc> const&, 
                    unordered_set<Value, Hash, Pred, Alloc> const&);
  template<typename Value, typename Hash, typename Pred, typename Alloc> 
    void swap(unordered_set<Value, Hash, Pred, Alloc>&, 
              unordered_set<Value, Hash, Pred, Alloc>&);
  template<typename Value, typename Hash = boost::hash<Value>, 
           typename Pred = std::equal_to<Value>, 
           typename Alloc = std::allocator<Value> > 
    class unordered_multiset;
  template<typename Value, typename Hash, typename Pred, typename Alloc> 
    bool operator==(unordered_multiset<Value, Hash, Pred, Alloc> const&, 
                    unordered_multiset<Value, Hash, Pred, Alloc> const&);
  template<typename Value, typename Hash, typename Pred, typename Alloc> 
    bool operator!=(unordered_multiset<Value, Hash, Pred, Alloc> const&, 
                    unordered_multiset<Value, Hash, Pred, Alloc> const&);
  template<typename Value, typename Hash, typename Pred, typename Alloc> 
    void swap(unordered_multiset<Value, Hash, Pred, Alloc>&, 
              unordered_multiset<Value, Hash, Pred, Alloc>&);
}
namespace boost {
  template<typename Key, typename Mapped, typename Hash = boost::hash<Key>, 
           typename Pred = std::equal_to<Key>, 
           typename Alloc = std::allocator<std::pair<Key const, Mapped>> > 
    class unordered_map;
  template<typename Key, typename Mapped, typename Hash, typename Pred, 
           typename Alloc> 
    bool operator==(unordered_map<Key, Mapped, Hash, Pred, Alloc> const&, 
                    unordered_map<Key, Mapped, Hash, Pred, Alloc> const&);
  template<typename Key, typename Mapped, typename Hash, typename Pred, 
           typename Alloc> 
    bool operator!=(unordered_map<Key, Mapped, Hash, Pred, Alloc> const&, 
                    unordered_map<Key, Mapped, Hash, Pred, Alloc> const&);
  template<typename Key, typename Mapped, typename Hash, typename Pred, 
           typename Alloc> 
    void swap(unordered_map<Key, Mapped, Hash, Pred, Alloc>&, 
              unordered_map<Key, Mapped, Hash, Pred, Alloc>&);
  template<typename Key, typename Mapped, typename Hash = boost::hash<Key>, 
           typename Pred = std::equal_to<Key>, 
           typename Alloc = std::allocator<std::pair<Key const, Mapped>> > 
    class unordered_multimap;
  template<typename Key, typename Mapped, typename Hash, typename Pred, 
           typename Alloc> 
    bool operator==(unordered_multimap<Key, Mapped, Hash, Pred, Alloc> const&, 
                    unordered_multimap<Key, Mapped, Hash, Pred, Alloc> const&);
  template<typename Key, typename Mapped, typename Hash, typename Pred, 
           typename Alloc> 
    bool operator!=(unordered_multimap<Key, Mapped, Hash, Pred, Alloc> const&, 
                    unordered_multimap<Key, Mapped, Hash, Pred, Alloc> const&);
  template<typename Key, typename Mapped, typename Hash, typename Pred, 
           typename Alloc> 
    void swap(unordered_multimap<Key, Mapped, Hash, Pred, Alloc>&, 
              unordered_multimap<Key, Mapped, Hash, Pred, Alloc>&);
}

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