| Re: [eigen] Leading underscroes |
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- To: eigen <eigen@xxxxxxxxxxxxxxxxxxx>
- Subject: Re: [eigen] Leading underscroes
- From: Gael Guennebaud <gael.guennebaud@xxxxxxxxx>
- Date: Tue, 30 Jul 2013 14:39:32 +0200
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Hi,
I agree, we've been too easy on that. A simple:
grep -e "[ (,_]_[a-zA-Z0-9]" Eigen/* -R
tells me there are numerous such occurences!
gael
On Tue, Jul 30, 2013 at 8:10 AM, Hauke Heibel <hauke.heibel@xxxxxxxxx> wrote:
> Hi,
>
> I want to suggest that we refrain from using leading underscores in the
> future because of clause 17.4.3.1.2/1 which states that ...
>
> Certain sets of names and function signatures are always reserved to the
> implementation:
>
> * Each name that contains a double underscore (_ _) or begins with an
> underscore followed by an upper-case letter (2.11) is reserved to the
> implementation for any use.
> * Each name that begins with an underscore is reserved to the implementation
> for use as a name in the global namespace.
>
> In particular the first bullet point can lead to issues and did so on Cygwin
> which did not like the variable name _X. My suggestion to completely stop
> using leading underscores is just a precaution in order to prevent any
> future issues.
>
> Regards,
> Hauke