Re: Question about compiling some C++ code.

Note it makes a difference what you name your file.  If you
name your file something.c, then gcc is invoked, and the code
is compiled as if it were a C program, so standard C++ 
libraries are not linked automatically.  If you name something
on the other hand something.cpp, g++ is used, and the code is 
compiled as C++ code, linking libstdc++ and making C++ functions
available...

Wayne Keen