An extremely memory-efficient hash map implementation. 2 bits/entry overhead! The SparseHash library contains several hash map implementations, including implementations that optimize for space or speed. These hashtable implementations are similar in API to SGI's hash_map class and the tr1 unordered_map class, but with different performance characteristics. It's easy to replace hash_map or unordered_map by sparse_hash_map or dense_hash_map in C++ code. They also contain code to serialize and unserialize from disk.
WWW: https://github.com/geoffpike/sparsehash
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