[antlr-interest] C++ compliance of antlr generated code

[sohail at taggedtype.net]

Quoting Maurizio de Pascale <mdepascale at dii.unisi.it>:

> the C++ code generated by ANTLR (latest 2.7.X) uses lots of variables
> starting with '_', which is however forbidden by the standard since
> symbols starting with an underscore are reserved to the implementation.
> I suggest taking care of this for the ANTLR 3 C++ target.

 From what I recall, symbols starting with _ are reserved in the  
global namespace.