sparsehash: SparseHash (Hash_map Implementation Library)
sparsehash:
sparsehash: SparseHash is a extremely memory-efficient hash_map implementation
sparsehash: 2 bits/entry overhead! The  SparseHash  library  contains  several
sparsehash: hash-map implementations, including implementations  that optimize
sparsehash: for space or speed. 
sparsehash:
sparsehash:
sparsehash:
sparsehash:
sparsehash: