Path: utzoo!yunexus!geac!syntron!jtsv16!uunet!lll-winken!lll-tis!ames!think!bloom-beacon!ATHENA.MIT.EDU!swick
From: swick@ATHENA.MIT.EDU (Ralph R. Swick)
Newsgroups: comp.windows.x
Subject: Re: Size of double is 64 bits on Sun-386i
Message-ID: <8810241206.AA24561@LYRE.MIT.EDU>
Date: 24 Oct 88 12:06:28 GMT
Article-I.D.: LYRE.8810241206.AA24561
References: <8810181816.AA00928@litp.unip6-7.fr>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: DEC/MIT Project Athena
Lines: 8

> Floating point variables can not be used directly in callbacks

Correct.  Unfortunately this is a major interface change for
applications, though admittedly, they are currently non-portable.

In R3, Scrollbar will provide an additional callback list,
XtNjumpProc, which has the same semantics as XtNthumbProc but
passes the percent by reference.  This way we won't break all
applications on day 1.