Path: utzoo!attcan!uunet!ginosko!brutus.cs.uiuc.edu!usc!ucsd!ogccse!cvedc!nosun!qiclab!m2xenix!randy From: randy@m2xenix.UUCP (Randy Bush) Newsgroups: comp.lang.modula2 Subject: Re: Question on Logitech Type Conversion Keywords: Logitech, Type Conversion, Opaque types Message-ID: <393@m2xenix.UUCP> Date: 30 Sep 89 06:51:54 GMT References: <35093@apple.Apple.COM> Reply-To: randy@m2xenix.UUCP (Randy Bush) Organization: Pacific Systems Group, Portland Oregon US Lines: 25 In article <35093@apple.Apple.COM> lins@Apple.COM (Chuck Lins) writes: > DEFINITION MODULE Items; > TYPE Item; > END Items. > ... > PROCEDURE CharCompare (left:Item; right:Item): Relation; > VAR leftChar : CHAR; > BEGIN > leftChar := CHAR(left); (* error: 'uncompatible types in conversion' *) But, the type transfer CHAR(left) requires that left occupy the same number of bits as a CHAR, and this would not seem to be the case here, where left would seem to be a pointer. Also, the importing module would seem to be trying to peek through the opaque if it tried something like CHAR(left^). >This all compiles fine under JPI's TopSpeed Modula-2. This may not be to their credit. -- uunet!tektronix ----\ sun!nosun --------- qiclab ---- m2xenix!randy or randy@m2xenix.uucp uunet!oresoft ------------------/