On Thu, Oct 9, 2008 at 14:29, David Mansfield <david@xxxxxxxxxx> wrote:
> namespace n1 {
> class C {};
> void f(C& c) {}
> }
>
> namespace n2 {
> using n1::C;
> void f(C& c) {}
> }
>
> using namespace n2;
>
> void foo(C& c)
> {
> f(c);
> }
>
> Why won't it automatically use n2::f() in this case? What makes this
> ambiguous? Should the n1 namespace be hidden unless I'm "using" it?
>
C is defined in n1, so Argument-Dependant Lookup (aka Koenig Lookup)
will find the f in n1, and the using directive means it also finds the
f in n2.
HTH,
~ Scott
