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Re: e and pi
From: |
David Kastrup |
Subject: |
Re: e and pi |
Date: |
Sat, 18 Sep 2010 12:50:22 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
Eli Zaretskii <address@hidden> writes:
>> From: Helmut Eller <address@hidden>
>> Date: Fri, 17 Sep 2010 18:18:25 +0200
>>
>> > (defun froob (argv)
>> > (lambda (f) (cons f argv)))
>> >
>> > and have that fail, because "argv" is a defvar defined in startup.el.
>>
>> I once had a function with an argument called system-name. Suddenly
>> Emacs started to complain that some files are locked by some other user.
>> How many people now that system-name is a global variable and used by
>> the file-locking code? The lesson is that Emacs should not pre-define
>> global variables with names that are likely candidates for local
>> variables.
>
> What you describe as a big surprise is actually known to every C/C++
> programmer: some names are "reserved by the implementation" and should
> not be used by the application code.
For a function argument? I beg to differ. The only way to get a
conflict is using extern declarations.
And identifiers reserved by the implementation start with two
underlines.
--
David Kastrup
- Re: e and pi, (continued)
- Re: e and pi, Wojciech Meyer, 2010/09/17
- Re: e and pi, Chong Yidong, 2010/09/17
- Re: e and pi, Wojciech Meyer, 2010/09/17
- Re: e and pi, Helmut Eller, 2010/09/17
- Re: e and pi, Glenn Morris, 2010/09/17
- Re: e and pi, Glenn Morris, 2010/09/17
- Re: e and pi, Eli Zaretskii, 2010/09/18
- Re: e and pi, Helmut Eller, 2010/09/18
- Re: e and pi, Eli Zaretskii, 2010/09/18
- Re: e and pi, Helmut Eller, 2010/09/18
- Re: e and pi,
David Kastrup <=
- Re: e and pi, Eli Zaretskii, 2010/09/18
- Re: e and pi, Andreas Schwab, 2010/09/18
- Re: e and pi, Stephen J. Turnbull, 2010/09/18
- RE: e and pi, Drew Adams, 2010/09/18
- Re: e and pi, Stefan Monnier, 2010/09/17
- Re: e and pi, Chong Yidong, 2010/09/17
- Re: e and pi, Stefan Monnier, 2010/09/18
- Re: e and pi, Chong Yidong, 2010/09/18
- Re: e and pi, Uday S Reddy, 2010/09/18
- RE: e and pi, Drew Adams, 2010/09/18