Question

I’ve got something like this:

namespace n1
{
    namespace n2
    {
        class foo{}
    }
}

In other file I write:

using n1;

Why I can’t type now something like:

n2.foo smthing;

And how to make something like this possibile?

Answer 1

Use namespace aliases:

using n2 = n1.n2;

...
n2.foo something;

What is before the class name should be a complete name space (with/or other class name(s) for nested types). A truncated namespace will not work.