DECO

"DECO (Dynamic Encapsulator of C++ Objects) converts DC++, essentially C++ with extensions for "dynamic encapsulation," into standard C++. Used as-is, DECO can only convert the simplest form of interfaces (types) and implementations to C++, so although it could be interesting, its most practical use is probably to provide a start for parsing C++. Note that template and exception handling support is incomplete in the parser, since DC++ did not make use of these features." (Description on Freshmeat)