Web Reference: Dec 8, 2009 · You could, for instance, make an allocator with a method called preallocate(int N) which would reserve N bytes, then use unordered_map::get_allocator() for all your fun. Since Boost.Unordered uses boost::hash it also supports some other types, including standard containers. To use any types not supported by these methods you have to extend Boost.Hash to support the type or use your own custom equality predicates and hash functions. Fully conformant implementations of std::unordered_[multi](set|map), but faster and up to the latest revisions of the standard even if you're working in an older version of C++ (heterogeneous lookup, try_emplace, contains, etc.)
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