C++ name with leading underscore character not Compiling

Adye, TJ (Tim) T.J.Adye@rl.ac.uk
Mon Apr 16 12:13:00 GMT 2007

> > 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).


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

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