[ns] TclObject Lookup function

[Safiya Nureen]

I searched pointers but i did not find any help about this kind of statement 
like below. anybody knows about the what exactly this means. I am new to C 
pointers.
 
mac_ = (Mac*) TclObject::lookup(argv[2]);

in these lines
 
if (strcmp(argv[1], "mac") == 0) {
   mac_ = (Mac*) TclObject::lookup(argv[2]);
                        assert(mac_);
   return (TCL_OK);
  }
 
 

Safiya
King Faisal Univ.
Saudi Arabia