This method has three variants:
*:int EvalString(const char*, const class AttrList*, char*)
*:int EvalString(const char*, const class AttrList*, char **value)
*:int EvalString(const char*, const class AttrList*, MyString& value)

New {quote:ClassAds} already have a compatibility version of the first variant. Writing compatibility methods for the other two will be easy.

Developer time: 1 hour