Compiler namespace support

I was thinking of cleaning up the library code a little bit by removing
all the STDNS macro stuff, to be replaced with actual namespace support.
I believe that most C++ compilers by now support namespaces more
thoroughly than when I originally wrote the code.  I know gcc has worked
with namespaces for perhaps the last 3 major revisions.

My question is this: is anyone using a compiler that, were I to remove
the STDNS macro and require namespace support, would not be able to
compile the library?

-Stephen