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Showing content from https://timsong-cpp.github.io/cppwp/n4659/unord.map.syn below:

[unord.map.syn]

26 Containers library [containers] 26.5 Unordered associative containers [unord] 26.5.2 Header <unordered_­map> synopsis [unord.map.syn]
#include <initializer_list>

namespace std {
    template <class Key,
            class T,
            class Hash = hash<Key>,
            class Pred = equal_to<Key>,
            class Alloc = allocator<pair<const Key, T>>>
    class unordered_map;

    template <class Key,
            class T,
            class Hash = hash<Key>,
            class Pred = equal_to<Key>,
            class Alloc = allocator<pair<const Key, T>>>
    class unordered_multimap;

  template <class Key, class T, class Hash, class Pred, class Alloc>
    void swap(unordered_map<Key, T, Hash, Pred, Alloc>& x,
              unordered_map<Key, T, Hash, Pred, Alloc>& y)
      noexcept(noexcept(x.swap(y)));

  template <class Key, class T, class Hash, class Pred, class Alloc>
    void swap(unordered_multimap<Key, T, Hash, Pred, Alloc>& x,
              unordered_multimap<Key, T, Hash, Pred, Alloc>& y)
      noexcept(noexcept(x.swap(y)));

  template <class Key, class T, class Hash, class Pred, class Alloc>
    bool operator==(const unordered_map<Key, T, Hash, Pred, Alloc>& a,
                    const unordered_map<Key, T, Hash, Pred, Alloc>& b);
  template <class Key, class T, class Hash, class Pred, class Alloc>
    bool operator!=(const unordered_map<Key, T, Hash, Pred, Alloc>& a,
                    const unordered_map<Key, T, Hash, Pred, Alloc>& b);
  template <class Key, class T, class Hash, class Pred, class Alloc>
    bool operator==(const unordered_multimap<Key, T, Hash, Pred, Alloc>& a,
                    const unordered_multimap<Key, T, Hash, Pred, Alloc>& b);
  template <class Key, class T, class Hash, class Pred, class Alloc>
    bool operator!=(const unordered_multimap<Key, T, Hash, Pred, Alloc>& a,
                    const unordered_multimap<Key, T, Hash, Pred, Alloc>& b);

  namespace pmr {
    template <class Key,
              class T,
              class Hash = hash<Key>,
              class Pred = equal_to<Key>>
      using unordered_map =
        std::unordered_map<Key, T, Hash, Pred,
                           polymorphic_allocator<pair<const Key, T>>>;
    template <class Key,
              class T,
              class Hash = hash<Key>,
              class Pred = equal_to<Key>>
      using unordered_multimap =
        std::unordered_multimap<Key, T, Hash, Pred,
                                polymorphic_allocator<pair<const Key, T>>>;

  }
}

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