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Subject: Re: [boost] [UUID] Still alive?
From: Andy Tompkins (atompkins_at_[hidden])
Date: 2008-09-18 23:06:02

On Thu, 18 Sep 2008 01:26:27 +0200, "Manuel Fiorelli"
<manuel.fiorelli_at_[hidden]> said:
> Since UUIDs are generally used to identify resources, it could be that
> someone wants to instantiate Boost.Unordered with UUID. I don't know
> exectly what are the requirements for the type parameter of
> Boost.Unorder, but I hope that most of them are yet met by UUID.
> Surely it is necessary to extend Boost.Hash, but according to <
>> this
> can be done defining a free function without any explicit coupling
> with Boost.Unordered/Hash.
> Summarizing the support for Boost.Hash/Unorded should be a zero-cost
> addition which should't cause the inclusion of no headers from those
> libraries.
> Best regards, Manuel Fiorelli

I will add support for this (without including
boost\functional\hash.hpp as follows (in namespace boost::uuids):
std::size_t hash_value(uuid const& u)
    size_t seed = 0;
    for(uuid::const_iterator i=u.begin(); i != u.end(); ++u) {
        seed ^= static_cast<size_t>(*i) + 0x9e3779b9 + (seed << 6) +
        (seed >> 2);
    return seed;

Andy Tompkins

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