view sequences/+seq/nil.m @ 61:eff6bddf82e3 tip

Finally implemented perceptual brightness thing.

% nil - empty sequence constructor
%
% nil :: void -> seq(_).
classdef nil < seq
	methods
		function o=nil, end
		function x=head(o), error('nil: no head'); end
		function b=next(o), error('nil: no next'); end
		function z=elsize(o), z=[nan,nan]; end
		function s=tostring(o), s='nil'; end
		function f=isempty(o), f=true; end
	end
end