[Dune] dune-grid r4390 - trunk/grid/alugrid/3d

[Martin Nolte]

Hi Dune,

I don't see any advantage in this proposal. The world nullptr is just a 
suggestion and might change in the future. This could mean that we always have 
to provide a macro. Moreover, the casts would still have to be added, since 
even (void*)0 does not cast into MyPointer* automatically.

I think we should wait at least until gcc incorporates such a keyword into 
-std=c++0x. But even then, users will likely use older compilers and we have 
to remain compatible with them, meaning we still might have to cast.

By the way: Calling a constructor like pair< A*, int >( nullptr, -1 ) is a bad 
idea anyway because the argument types are template parameters.

Cheers,

Martin

Christian Engwer wrote:
> On Wed, Sep 17, 2008 at 11:04:20AM +0200, Oliver Sander wrote:
>> Hi Dune!
>> Apparently, the official C++0x solution for this problem is the use of
>> the new nullptr keyword.  see
>> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf
>>
>> Maybe we should anticipate that somehow.
> 
> It would be easy to provide a 
> #define nullptr 0
> if the nullptr keyword is not known to the compiler.
> 
> Opinons?
> 
> Cheers
>   Christian
> 
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-- 
Martin Nolte <nolte at mathematik.uni-freiburg.de>

Universität Freiburg                                   phone: +49-761-203-5642
Abteilung für angewandte Mathematik                    fax:   +49-761-203-5632
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