From: Trans <transfire@...>
Date: 2005-11-24T04:12:25+09:00
Subject: Re: string range membership

> I can't find this discussion in the archive.  Can you give me a link
> or a message number?

Largely from Ruby-talk 115120, although the solution really came about
on the old suby-muse mailing list.

I'm not sure everyone understood me though. The problem is that
String's #<=> and #succ methods are not compatible. Therefore
Range#member? and Rage#include? which use #<=> can not provide proper
results for String-based Ranges. The solution is to have Range use a
different comparision method, namely #cmp. In most classes #cmp will of
course just be an alias for #<=>, but it String is would differ to be
compatible with #succ, and then #include and #member would be correct.
Q.E.D.

T.