Re: [eigen] Namespaces

[Andre Krause <post@xxxxxxxxxxxxxxxx>]

Cyrille Berger wrote:
> On Wednesday 10 October 2007, Benoît Jacob wrote:
> > we initially used namespaces, but switched to prefixing recently. The
> > reason is that namespace offer little protection as most users will want to
> > be "using namespace". For instance look at the EiObject class. Without
> > prefix, it'd be Object. A much too common name. If we encapsulate it in a
> > namespace, it becomes Eigen::Object, which is safe, but... most users would
> > like to "using namespace Eigen" and if some class is called "Object" then
> > "using namespace" is not an option, because "Object" is a too polluting
> > name.
>
> In that case the compiler would return an error, it's hardly a problem.
>
> > Look at what Qt does. Qt classes are not encapsulated in any namespace,
> > instead they have the Q prefix, like "QObject".
>
> Qt was first release at a time when namespaces were not well (if at all) 
> supported by most C++ compiler.

why not make the eigen namespace name shorter?

instead of Eigen::Vector<float,4>, just

ei::Vector<float,4> ...

it just looks better / more modern than EiVector...
and if it is that short, one is less tempted to use "using namespace".

and finally, it is no problem to use some typedefs.

so i personally would rather like to see the prefix "Ei" removed.. but well,
i could also easily life with the prefix. its just a bit uglier.