=====export=====
The export keyword is intended to allow definitions of C++ templates to be
separated from their declarations. While officially part of the C++ standard,
the export keyword is only supported by a few compilers (such as the 
[[http://www.comeaucomputing.com/| Comeau C++]] compiler) and is not supported 
by such mainstream compilers as [[http://gcc.gnu.org/|GCC]] and 
[[http://msdn.microsoft.com/en-us/library/60k1461a.aspx|Visual C++]].