________________________________________ De: boost-users-bounces@lists.boost.org [boost-users-bounces@lists.boost.org] En nombre de Daniel James [daniel_james@fmail.co.uk] Enviado el: jueves, 21 de mayo de 2009 21:36 Para: boost-users@lists.boost.org Asunto: Re: [Boost-users] Boost.Unordered throws 64-bit portability warnings 2009/5/21 Dominique Devienne :

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FWIW, I'm getting these as well when using boost::hash_combine(hash_value(this->member_)); to implement hashes for my classes. We also use VS2005 with the compiler switch that raises these warnings. My work around below is not pretty... --DD

#if ACME_SIZEOF_SIZE_T == 4 // Avoid warning C4267: 'argument' : // conversion from 'size_t' to 'unsigned int', possible loss of data boost::hash_combine( seed, static_cast<unsigned int>(hash_value(member_)) ); #else boost::hash_combine(seed, hash_value(member_)); #endif

Doesn't 'boost::hash_combine(seed, member_)' work?

I'll have a look at the warning when I get the chance, but AFAICT they're wrong since when compiling for 64-bit a different overload or template resolution would be chosen.

Is this maybe related to http://lists.boost.org/boost-users/2007/03/26388.php ? Joaquín M López Muñoz Telefónica, Investigación y Desarrollo