At the time of writing, GCC does not support the new C++
keyword (GCC 3.4.4).
This keyword was proposed as a way of separating the interface of
templates from their implementation. However it adds its own complexity
to the linking process, which can detract from any advantages in
export keyword is not widely used, and most other compilers
do not support it either. The inclusion compilation model described
earlier is recommended as the simplest and most portable way to use