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Re: Guile: What's wrong with this?
From: |
David Kastrup |
Subject: |
Re: Guile: What's wrong with this? |
Date: |
Wed, 04 Jan 2012 15:45:12 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux) |
Mike Gran <address@hidden> writes:
> If you follow that logic, then Guile is left without any shorthand
> to create and initialize a mutable string other than
>
> (define y (substring "hello" 0))
> or
> (define y (string-copy "hello"))
Sure. Guile does not have shorthands for _mutable_ literals for lists
or vectors either. One of the most significant points of a literal is
that you can rely on it staying the same.
> Someone coming from any other language would be surpised to find that
> the above is what you need to do to create an initialize a mutable
> string, I think.
I don't know any language that permits the modification of literals.
> But 'define' just as easily can be considered a generic constructor
> that is overloaded in a C++ sense,
It can be considered a lot of things that don't make sense.
> and when "hello" is a string, y is assigned a copy-on-write version of
> the immutable string. It was wrong to change this without
> deprecating it first.
Modifying literals _never_ _ever_ was guaranteed to lead to predictable
results. Undefined behavior before, undefined behavior afterwards.
There is no point in _deprecating_ something that _always_ was undefined
behavior.
--
David Kastrup
- Re: Guile: What's wrong with this?, (continued)
- Re: Guile: What's wrong with this?, Mark H Weaver, 2012/01/06
- Re: Guile: What's wrong with this?, David Kastrup, 2012/01/06
- Re: Guile: What's wrong with this?, David Kastrup, 2012/01/05
- Re: Guile: What's wrong with this?, Ludovic Courtès, 2012/01/04
- Re: Guile: What's wrong with this?, Mike Gran, 2012/01/03
- Re: Guile: What's wrong with this?, nalaginrut, 2012/01/04
- Re: Guile: What's wrong with this?, David Kastrup, 2012/01/04
- Re: Guile: What's wrong with this?, Ludovic Courtès, 2012/01/04
- Re: Guile: What's wrong with this?, Mark H Weaver, 2012/01/04
- Re: Guile: What's wrong with this?, Mike Gran, 2012/01/04
- Re: Guile: What's wrong with this?,
David Kastrup <=
- Re: Guile: What's wrong with this?, Andy Wingo, 2012/01/04
- Re: Guile: What's wrong with this?, David Kastrup, 2012/01/04
- Re: Guile: What's wrong with this?, Andy Wingo, 2012/01/04
- Re: Guile: What's wrong with this?, David Kastrup, 2012/01/04
- Re: Guile: What's wrong with this?, Andy Wingo, 2012/01/04
- Re: Guile: What's wrong with this?, Bruce Korb, 2012/01/04
- Re: Guile: What's wrong with this?, David Kastrup, 2012/01/04
- Re: Guile: What's wrong with this?, Ian Price, 2012/01/04
- Re: Guile: What's wrong with this?, Mark H Weaver, 2012/01/04
- Re: Guile: What's wrong with this?, Bruce Korb, 2012/01/04