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nested namespaces

Started by quasar3d Dec 7, 2003 at 7:11 AM 6 replies 450+ views

Original Post

Dec 7, 2003 at 7:11 AM

Are they a good idea? I''ve never seen anyone use them before, but I''ve a case where I think it might be a good idea. I have my engines namespace, and now I''ve the lightwave specific stuff. I will probably have the same classes again, when I will add 3dmax support. So is this a good idea for a nested namespace, or should I just create a new namespace within the global namespace? My Site

Fruny

Dec 7, 2003 at 7:18 AM

Nested namespaces are perfectly fine.

Additionally, you can have a look at namespace aliasing:

using namespace alias = original; alias::foo; // refers to original::foo

Before you ask - it is compile-time only, you can''t switch namespaces at run-time. Good try though

quasar3d

Dec 7, 2003 at 8:05 AM

thanks, It seems handy to me, but I also could imagine one might find it clumpsy or so. It can be pretty anoying to type ns1::ns2::ns3::function.

quote:
Original post by Fruny
Before you ask - it is compile-time only, you can't switch namespaces at run-time. Good try though

Yes, I know that

, but else I would have classes named LWMESH and MAXMESH, and LWSURFACE and MAXSURFACE. But I don't want to switch on runtime. They don't even have the same member functions.

My Site

[edited by - Quasar3D on December 7, 2003 9:06:11 AM]

Narcist

Dec 7, 2003 at 8:10 AM

quote:
Original post by quasar3d
thanks, It seems handy to me, but I also could imagine one might find it clumpsy or so. It can be pretty anoying to type ns1::ns2::ns3::function.

thats what using ns1::ns2::ns3 would be for.. but of course you only do that in the smallest scope..

blizzard999

Dec 7, 2003 at 9:49 AM

Nested namespaces are good!

something like this


namespace _3D
{

namespace LW
{
 void function(...);
}

}

Out of namespace _3D (at 'global' level) you can access
function in this way


_3D::LW::function(...);

You can access function directly by declaring you want to use _3D::LW namespace


using namespace ::_3D::LW;
function(...);

[edited by - blizzard999 on December 7, 2003 10:49:58 AM]

JOL

Mar 8, 2004 at 2:31 AM

I use a nested namespace for some default values in a small library I''m writing, looks better than #defines and makes more sense aswell, const ''variables''...

Arild Fines

Mar 8, 2004 at 7:31 AM

Too bad you can''t declare them in a natural, indentation-friendly, way in C++.

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antareus

Mar 8, 2004 at 7:49 AM

True that.

I end up putting my usual three namespaces all at the same indentation level and then indenting once. Hacky, but works.

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