Sometimes you might want to use a template class that would inherit Standard_Transient (or its subclass). As you need to pair it with a handle counterpart (which would have to inherit respective Handle_Standard_Transient subclass), you can't do this with the DEFINE_STANDARD_HANDLE macro directly. This post explains how you could do this.ACIS and Parasolid formats (like IGES or STEP for instance) represent a file...
