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valid_override - controls the use of efun::


int valid_override( string file, string efun_name , string main_file );


Add  valid_override  to  master.c  in  order  to control the use of the
efun:: prefix.  The valid_override function in master.c will be  called
each  time  the  driver attempts to compile a function call that begins
with efun::.  If valid_override returns 0, then that compile will fail.
Thus valid_override provides a way to modify the behavior of efuns that
isn't circumventable via the efun:: prefix (by having a  simul_efun  of
the same name as the efun to be modified and having valid_override dis‐
allow that simul_efun from being overriden).  File will be  the  actual
file the call appears in; mainfile will be the file being compiled (the
two can differ due to #include)

If you wish to have the original 3.1.2 efun:: behavior,  simply  add  a
line to master.c that looks like this:

   int  valid_override(string  file,  string  efun, string main_file) {
return 1; }

Here is an example valid_override that is more restrictive:

  valid_override(string file, string name, string main_file)
      if (file == "/adm/obj/simul_efun") {
          return 1;
      if (name == "destruct")
          return 0;
      if (name == "shutdown")
          return 0;
      if (name == "snoop")
          return 0;
      if (name == "exec")
          return 0;
      return 1;




valid_object(4), function_exists(3)