User definable operators

William Clodius <>
14 Dec 1996 00:38:47 -0500

          From comp.compilers

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From: William Clodius <>
Newsgroups: comp.compilers
Date: 14 Dec 1996 00:38:47 -0500
Organization: Los Alamos National Lab
Keywords: design, question

Many programming languages allow the user to overload of language
defined operators. But a few languages also allow the user to define
their own operators. I would like to have some feedback on the
experience of others with user definable operators with respect to
specifying their syntax, associativity, precedence, semantics (e.g.,
side effects or not), etc.
William B. Clodius Phone: (505)-665-9370
Los Alamos Nat. Lab., NIS-2 FAX: (505)-667-3815
PO Box 1663, MS-C323 Group office: (505)-667-5776
Los Alamos, NM 87545 Email:
[My experience with such languages has been miserable. It means that no
two programs are actually written in the same language, so they're all
unreadable. Extensible languages enjoyed a short vogue in the 1970s, and
I wasn't sad to see them go. See Cheatham's EL/1 and Irons' IMP72. -John]


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