Adding types to the std namespace

Question

Is it acceptable to add types to the std namespace. For example, I want a TCHAR-friendly string, so is the following acceptable?

#include 

        

Answer 1

No ... part of the point of a namespace is to prevent name collisions on upgrade.

If you add things to the std namespace, then your code might break with the next release of the library if they decide to add something with the same name.