RE: [Boost-Users] pool_allocator problems on VC7.1 (real release)

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2003-04-23 09:09:23

John Harris <john.harris_at_[hidden]> wrote:
> scleary_at_[hidden] wrote:
> > John -
> > 
> > Sorry, Boost.Pool does not currently support MSVC, due to that
compiler's
> > extreme lack of template support.
> > 
> 
> I also tried this on the real released VC7.1 (which has been on MSDN 
> subscriber downloads for a couple of weeks, now), and, while it 
> compiles, I get warnings that point me to some code that looks like 
> it's losing precision (size_type reduced to bool) in a calculation.

VC++ has produced that warning for a while now, and it's totally bogus.
Notice that it's a "performance warning" not an "are you sure this is
that you want?" warning, and it's being generated here for *casts* not
implicit conversions.

<snip> 
> Another test I tried was a map<string,string>, actually declared like 
> this:
> 
> typedef 
> std::basic_string<char,std::char_traits<char>,boost::pool_allocator<ch
> ar> > t;
> std::map<t, t, std::less<t>, boost::pool_allocator<std::pair<const t, 
> t> > > m;
> 
> ...and got these errors:
<snip>

I compiled almost the exact same code:

    #include <boost/pool/pool_alloc.hpp>
    #include <map>
    #include <utility>

    typedef
std::basic_string<char,std::char_traits<char>,boost::pool_allocator<char
> > t;

    int main()
    {
        std::map<t, t, std::less<t>,
boost::pool_allocator<std::pair<const t, t> > > m;
    }

with VC++ 7.0 and Boost 1.29, and got no warnings or errors at all.

The command line was:

    cl /D__WIN32__ /EHsc /I"c:\program files\boost" test.cpp

I repeated this with Boost 1.30 and again got no warnings or errors.

I don't have VC++ 7.1 to hand, but I would be surprised if it broke
anything
that worked in 7.0.