bool Get(const OEExprBase *&expr,
const char *&label,
const char *smarts) const
This method retrieves the ''label'' and corresponding
OEExprBase pointer reference as the first and second method
arguments, respectively, given a pointer to a position within a SMARTS
string given as the final argument. If the SMARTS string position
points to the beginning of a vector bound ''label'' contained in the
OEVectorBindings instance then the method will return boolean true.
If the vector binding cannot be identified then the method will return
boolean false.