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Re: Declaring a local dynamic variable?
From: |
Barry Margolin |
Subject: |
Re: Declaring a local dynamic variable? |
Date: |
Mon, 23 Sep 2013 20:03:39 -0400 |
User-agent: |
MT-NewsWatcher/3.5.3b3 (Intel Mac OS X) |
In article
<slrnl41f9g.31s.joostkremers@j.kremers4.news.arnhem.chello.nl>,
Joost Kremers <joostkremers@yahoo.com> wrote:
> Barry Margolin wrote:
> > In article
> > <slrnl40qtk.31s.joostkremers@j.kremers4.news.arnhem.chello.nl>,
> > Joost Kremers <joostkremers@yahoo.com> wrote:
> >> Well, it would be great if the byte compiler could distinguish between
> >> the two cases, but apparently it's not. So I guess the question comes
> >> down to how easy/difficult would it be to implement a compiler that can?
> >
> > On what basis would it distinguish them? Search all packages to see if
> > any of them declare the variable?
>
> I realise that's a rhetorical question, but that wouldn't be a very good
Maybe the second one is slightly rhetorical, but the first certainly
wasn't. The difficulty isn't in implementation, it's in defining what
you mean by "a compiler that can". You can't implement something without
a specification of what it's supposed to do, and "do the right thing" is
not really detailed enough.
> idea. Suppose you mistype a local variable and some package happens to
> define a dynamic variable with the misspelled name...
That would be pretty unlikely, considering that package developers are
strongly encouraged to follow naming conventions. All the global
variables in a package should be prefixed with something identifying the
package (some programmers copy CL-style package:XXX naming, some use
package-XXX).
On the other hand, most programmers tend to use relatively short names
for local variables. The chance that a typo will happen to match one of
those prefixed variables is
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
- Re: Declaring a local dynamic variable?, (continued)
- Re: Declaring a local dynamic variable?, Andreas Röhler, 2013/09/20
- Message not available
- Re: Declaring a local dynamic variable?, Barry Margolin, 2013/09/20
- Re: Declaring a local dynamic variable?, Andreas Röhler, 2013/09/21
- Message not available
- Re: Declaring a local dynamic variable?, Barry Margolin, 2013/09/21
- Re: Declaring a local dynamic variable?, Andreas Röhler, 2013/09/21
- Message not available
- Re: Declaring a local dynamic variable?, Barry Margolin, 2013/09/21
- Re: Declaring a local dynamic variable?, Joost Kremers, 2013/09/23
- Message not available
- Re: Declaring a local dynamic variable?, Joost Kremers, 2013/09/23
- Re: Declaring a local dynamic variable?, Barry Margolin, 2013/09/23
- Re: Declaring a local dynamic variable?, Joost Kremers, 2013/09/23
- Re: Declaring a local dynamic variable?,
Barry Margolin <=
- Re: Declaring a local dynamic variable?, Joost Kremers, 2013/09/25
Re: Declaring a local dynamic variable?, Pascal J. Bourguignon, 2013/09/22
Message not available