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Subject: RE: C++ name with leading underscore character not Compiling
Date: Mon, 16 Apr 2007 13:13:38 +0100
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From: "Adye, TJ \(Tim\)" <T DOT J DOT Adye AT rl DOT ac DOT uk>
To: "Dave Korn" <dave DOT korn AT artimi DOT com>, <cygwin AT cygwin DOT com>
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> > So, the case here ("_name" as an argument name) should be fine.
> 
>   Except that that was just an example, and in fact a 
> misleading one, because what Chelton's code was /actually/ 
> using was "_N"...  hence the problem.

Ah yes, I didn't see that (I thought his second case was the example,
but you are right).

_N is used in <ctype> (as are a number of others like _U and _L). It
isn't used in the Linux versions (at least RedHat EL 3/4 and
derivatives), which is presumably why he didn't see it before porting.
Of course this is the danger of using non-standard language features -
these things come and bite you at unexpected times.

I'm a bit surprised this isn't flagged by the compiler (it warns you
about lots of other non-standard usages), though I guess it would be a
bit ugly to implement (the compiler would have to distinguish between
usage in a standard header and other code).

Tim.

===========================  cut here  ============================
 Tim Adye      T DOT J DOT Adye AT rl DOT ac DOT uk       http://hepunx.rl.ac.uk/~adye
 BaBar/Atlas Groups, Particle Physics Dept, Rutherford Appleton Lab

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