```cpp template < class Key, class Mapped, class Hash = boost::hash<Key>, class Pred = std::equal_to<Key>, class Alloc = std::allocator<std::pair<Key const, Mapped> > > class unordered_map; ```

bool operator==(point const& p1, point const& p2) { return p1.x == p2.x && p1.y == p2.y; }

bool operator==(point const& p1, point const& p2) { return p1.x == p2.x && p1.y == p2.y; }