From: John Maddock (john_at_[hidden])
Date: 2005-04-02 10:23:55
> * boost::hash derived from std::unary_function
> This introduces a completely unnecessary dependency on <functional>.
> boost::hash only needs to define result_type and argument_type.
As far as the TR is concerned it's a requirement for std::tr1::hash to
derive from std::unary_function, there's no leeway permitted.
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