Why can't i use partly qualified namespaces during object initialization?

Question

I suspect this is a question which has been asked many times before but i haven\'t found one.

I normally use fully qualified namespaces if i don\'t use that type of

Answer 1

This is documented in the standard in 3.8 Namespace and Type Names, but it's a bit convoluted to follow.

The gist of it that a partial namespace reference is only looked for in the namespace where it occurs, and each layer outwards. using-directives are not checked.

In your example, ns_1_1.Foo would be found if Foo is found anywhere in:

Program.Program.ns_1_1.Foo
Program.ns_1_1.Foo
ns_1_1.Foo