John Harris wrote:

Ben Hutchings wrote:

...

I compiled almost the exact same code:

#include #include <map> #include <utility>

typedef std::basic_string t;

int main() { std::map > > 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.