[antlr-interest] Simple C++ Support

[Christian Schladetsch]

Hello [Jim],

There is a very simple way to allow C++ support via your C target (for ANTLR
3.1b). All that has to happen is that the StringTemplate that generates the
FooParser.c from Foo.g3pl generates:

/* End of Header action.
 *
=============================================================================
 */
/* -----------------------------------------
 * Include the ANTLR3 generated header file.
 */
extern "C"
{
#include    "FooParser.h"
}

/* ----------------------------------------- */

That is, wrap the header include with extern "C", set the generated file to
build using C++ and away you go. I have tried this and it works, but I have
not changed the template as I only started using ANTLR today. Of course, it
would be nice if you could specify the generated file to have a .cpp
extension (or .cxx or .C).

Could this make it into a build soon? It is a trivial change and yet would
allow us to use C++ code in actions and predicates for parser and trees
which would be great for those of us that are writing C++ systems.

Regards,
Christian.
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