libcppa uses some C++11 compile-time tricks to generate 64-bit hashes from 10 character atoms (simple 6-bit lookup table, really):

https://groups.google.com/d/msg/boost-developers-archive/UKeAbZfQwEk/_SyEAVxpplAJ

10 characters gives a useful set of primitives. 128-bits would probably better (assuming this less dynamic use case where compile time determinism is a "feature").

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