Re: [Boost-bugs] [Boost C++ Libraries] #2841: boost::hash to support boost::dynamic_bitset

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #2841: boost::hash to support boost::dynamic_bitset
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-03-09 22:36:20

#2841: boost::hash to support boost::dynamic_bitset
  Reporter: astukalov_at_[hidden] | Owner: gennaro_prota
      Type: Feature Requests | Status: new
 Milestone: Boost 1.39.0 | Component: dynamic_bitset
   Version: Boost 1.38.0 | Severity: Optimization
Resolution: | Keywords:

Comment(by astukalov_at_[hidden]):

 Replying to [comment:3 danieljames]:
> '0', '00', '000' and '0000' should have different hash values, but
 unless I've misunderstood dynamic_bitset m_bits will be the same for all
 of them.
 I think so too. It should be true for all zero bitsets with lengths <=
 bits per bitset block. For bigger lengths - two and more values would be
 hash_combined, resulting in different hash key.

 Anyway, not including bitset length into hashing directly would have so
 small performance improvement, that I withdraw my previous comment. :)

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