This and other RFCs are available on the web at http://dev.perl.org/rfc/ =head1 TITLE Data types: Semi-finite (lazy) lists =head1 VERSION Maintainer: Damian Conway <[EMAIL PROTECTED]> Date: 4 Aug 2000 Last Modified: 18 Sep 2000 Mailing List: [EMAIL PROTECTED] Number: 24 Version: 2 Status: Withdrawn =head1 ABSTRACT This RFC proposes that the right operand of a C<..> operator may be omitted in a list context, producing a lazily evaluated semi-finite list. It is further proposed that operations on such lists also be carried out lazily. =head1 DESCRIPTION It is proposed that the right operand of a list context range operation be made optional. If omitted, the resulting range would become semi-infinite: for (1..) { print "The next number is: $_\n"; } @odds = grep { $_%2 } (1..); switch ($n) { case [32..] { print "Two many characters in filename" } case (@odds) { print "That's odd!" } } Note that the values in @odds would also be lazily generated (otherwise the C<grep> would never finish). =head1 IMPLEMENTATION Ask MJD. =head1 REFERENCES RFC proposing a co-routine mechanism The thoughts and writings of Mark-Jason Dominus.
