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### Header <boost/unordered_map.hpp>

    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>&);
    }