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

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2003-04-23 10:46:13

John Harris <john.harris_at_[hidden]> wrote:
> Ben Hutchings wrote:
> > 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.
> > 
> 
> Ah, yes, that works for me, too (no warning, either), but try adding 
> a line of code that actually uses the map, like this:
> 
> m["abc"] = "def";
> 
> and you get the following cascade of errors:
<snip>

Which all indicates that operator< is not defined for t, because we
didn't include <string>.

Let's not be so quick to blame the compiler.  VC++ 7 is a long way
ahead of version 6.