UPDATE_FVWM_SCREEN macro?

Does anybody know why this is a macro and not a function?
(screen.h)

#define UPDATE_FVWM_SCREEN(fw)						   \
	do {								   \
		rectangle g;						   \
		struct monitor *mnew;					   \
									   \
		get_unshaded_geometry((fw), &g);			   \
		mnew =3D FindScreenOfXY((fw)->g.frame.x, (fw)->g.frame.y);   \
		/* Avoid unnecessary updates. */			   \
		if (mnew =3D=3D (fw)->m)					   \
			break;						   \
		(fw)->m_prev =3D (fw)->m;					   \
		(fw)->m =3D mnew;						   \
		(fw)->Desk =3D mnew->virtual_scr.CurrentDesk;		   \
		EWMH_SetCurrentDesktop((fw)->m);			   \
		desk_add_fw((fw));					   \
		BroadcastConfig(M_CONFIGURE_WINDOW, (fw));		   \
	} while(0)

The "do { ... } while (0)" was probably written by me.

Ciao

Dominik ^_^  ^_^

=2D-

Dominik Vogt