samer@0: function u=construct(s,sizes_in)
samer@0: 	u=mkunit(s);
samer@0: 	state=s.s0; fn=s.fn;
samer@0: 	u.sizes_out = guess_sizes(fn,state);
samer@0: 	u.get_state = @get_state;
samer@0: 	u.set_state = @set_state;
samer@0: 	u.process   = @proc;
samer@0: 
samer@0: 	function out=proc, [out,state]=fn(state); end
samer@0: 	function s=get_state, s=state; end
samer@0: 	function set_state(s), state=s; end
samer@0: end
samer@0: 
samer@0: function sz_out=guess_sizes(fn,st)
samer@0: 	[out,s1] = fn(st);
samer@0: 	sz_out = {size(out)};
samer@0: end
samer@0: