Question about namespaces

roxaz · Post by **roxaz** » Mon Feb 19, 2007 5:31 pm

I noticed that in most examples ony one namespace is used globaly, other namespaces are written in front of functions. But using all 6 namespaces globaly is more comfortable i say. But examples are written by much better programmers than me. So is there any difference?

monkeycracks · Post by **monkeycracks** » Mon Feb 19, 2007 5:38 pm

I use this :

using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace gui;
using namespace io;

Just because it's easier and you don't have to put the namespace prefix on everything.

Saturn · Post by **Saturn** » Mon Feb 19, 2007 6:27 pm

I usually open the namespaces only in cpp files and leave all types in headers fully scoped. This way there is no danger of name collision across includes, and in the cpp file itself, this is easy to resolve.

And I never open std, but always use it explicitly. Their names are very generic and the namespace name itself is short enough, to not make this awkward.

roxaz · Post by **roxaz** » Mon Feb 19, 2007 6:36 pm

aha, so there may be some name usage problems, i see now. last day i tried to use list in my project. it ended with lots of errors and no success. i gues this was std namespace problem... great that you mentioned it, thx

Acki · Post by **Acki** » Mon Feb 19, 2007 7:35 pm

roxaz wrote:aha, so there may be some name usage problems, i see now. last day i tried to use list in my project. it ended with lots of errors and no success. i gues this was std namespace problem... great that you mentioned it, thx

Yes, try to use all Irrlcht namespaces before #include <windows.h>...

fakin · Post by **fakin** » Tue Feb 20, 2007 5:30 am

well, using all namespaces may slow down your compilation time...

Saturn · Post by **Saturn** » Tue Feb 20, 2007 9:22 am

By about 0.01µs per file...

Midnight · Post by **Midnight** » Tue Feb 20, 2007 1:37 pm

Saturn wrote:By about 0.01µs per file...

yeah well there can be many files in a final project and if you're anything like me you compile 50 times after changing one letter.

or the classic oops forgot to tweak that or change that compile again oops another thing I missed and end up compiling a million times to look at the work for less then ten seconds lol.

I use all irrlicht namespaces once globally for small projects.