_last() Method - Object Cleanup

∟_last() Method - Object Cleanup

This section describes the _first() method for object cleanup.

The _last() method is for object cleanup during the object destruction process. To write the _last() method, you need to follow these rules:

The _last() method is located in the $instance definition body.
There is no arguments passed to the _last() method.
No need to return any data object from the _last() method.
The _last() will be called only by the H system.

Example of specifying the _last() method:

$class user: {
   
   counts = 0;
   
   $instance x: {
      x.login;
      x.password;
      $method x._first(l="guest", p="DontTell"): {
         x.login = l;
		 x.password = p;
		 ^.^.counts++;
      };
      $method x._last(): {
		 ^.^.counts--;
      };
   }
}

a = user(); 
b = user("herong"); 
c = user(p="******"); 
write(user.counts); # prints 3

$delete a;
write(user.counts); # prints 2