Re: Unexpected compiler behavior relating to size_t and boost - Visual Studio 2005.

From:
Unknownmat <unknownmat@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Sun, 13 Jul 2008 12:42:00 -0700 (PDT)
Message-ID:
<bf2e7a05-7ca0-4ba3-8e61-0326345fd5fc@p25g2000hsf.googlegroups.com>

Here is the smallest code I could come up with to reproduce the
behavior:

#include <vector>
#include <functional>
#include <boost/function.hpp>

template< class T >
void test()
{
        typedef std::vector< T > TItems;
        typedef boost::function< bool (T, T) > TCompFn;
        typedef std::vector< std::size_t > TSizes;

        TItems data;
        TCompFn fn = TCompFn( std::greater< T >() );
        fn( data.front(), data.front() ); // NOTE: data is empty - will
cause a runtime error if run

}

int main()
{
        test< int >();
        test< unsigned >();

}


I was able to reproduce the warning with an even smaller snippet of
code:

#include <vector>
#include <functional>
#include <boost/function.hpp>

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 );
}

The warning goes away if I comment out the line "std::vector<
std::size_t > sizes;". This behavior baffles me. Any insight would
again be appreciated.

Thanks,
Matt

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