Re: [Boost-users] Unexpected warning relating to boost::function, and size_t / unsigned

From: Anders Dalvander (anders_at_[hidden])
Date: 2008-07-14 04:51:38

Hi Matt,

Disable the /Wp64 switch. It is deprecated, as it gave false-positives 
and false-negatives, for explanation see: 
http://blogs.msdn.com/vcblog/archive/2007/08/10/the-future-of-the-c-language.aspx#4421146

Regards,
Anders Dalvander

> Hello,
>
> I'm receiving a compiler warning (MSVC8.0) that does not make sense to 
> me, and I wonder if this might be a boost related issue:
>
> int main()
> {
>     std::vector< std::size_t > sizes;
>     std::vector< unsigned > data;
>    
>     boost::function< bool (unsigned, unsigned) > fn = std::greater< 
> unsigned >();   
>     fn( data.front(), 10 ); // NOTE: data is empty - will cause runtime 
> error
> }
>
> The warning I get is:
> warning C4267: 'argument' : conversion from 'size_t' to 'unsigned int', 
> possible loss of data
> referring to the last line in main().
>
> Matt