Article View: comp.lang.modula2
Article #341Re: Defining Operators
From: Win Treese
Date: Fri, 06 Oct 1989 04:03
Date: Fri, 06 Oct 1989 04:03
23 lines
1320 bytes
1320 bytes
In article <INFO-M2%89093000360807@UCF1VM> Modula2 List <INFO-M2%UCF1VM.BITNET@PSUVM.PSU.EDU> writes:
>
> I was struck with an urge to think just the other day and came up with the
> following observation. I was flipping through some Ada books in the library
> ('cause they outnumber Modula-2 books about 20 to 1) and Ada seems to have a
> feature where you can define an operator for non-standard types. For example
> suppose you want to add two complex numbers. You have to:
It's worth noting that CLU does this (and has been around for a long time).
The compiler can do it automatically:
a + b
is simply syntactic sugar for
typeof(a)$add(a, b)
The types of a and b must match, of course.
3 + 5 is just int$add(3, 5).
Win Treese Cambridge Research Lab
treese@crl.dec.com Digital Equipment Corp.
Technical Details
Message-ID:
<852@crltrx.crl.dec.com>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!uakari.primate.wisc.edu!xanth!mcnc!decvax!crltrx!treeseReferences:
<INFO-M2%89093000360807@UCF1VM>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!uakari.primate.wisc.edu!xanth!mcnc!decvax!crltrx!treese From: treese@crltrx.crl.dec.com (Win Treese) Newsgroups: comp.lang.modula2 Subject: Re: Defining Operators Message-ID: <852@crltrx.crl.dec.com> Date: 6 Oct 89 04:03:17 GMT References: <INFO-M2%89093000360807@UCF1VM> Reply-To: treese@crltrx.crl.dec.com.UUCP (Win Treese) Organization: DEC Cambridge Research Lab Lines: 23