Telling the compiler that I am no longer using a namespace in C++

Question

the syntax:

 using namespace x;

tells the compiler to find the symbols from namespace x. The situation becomes bad once you have a same symbol in two namespaces and you want to mutually use them. Is there a way to tell the compiler not to use a namespace? What I mean is something like this (namespaces x and y both have the function a)

using namespace x;
int k = a(); //x::a is called
drop namespace x; //imaginary syntax that I am looking for
using namespace y;
int j = a(); //y::a is called

"You must use scope resolution symbol '::'" is not the answer I am looking for.

Answer 1

Since you don't want to use scope resolution, then create some additional scope:

{
    using namespace x;
    int k = a(); //x::a is called
}
{
    using namespace y;
    int j = a(); //y::a is called
}

I'm afraid this might turn to be worse than scope resolution, though :/

Edit:

One more thing (which I don't know if you're aware of) that might be helpful are namespace aliases. Say you've got a namespace with a disgustingly long name or multiple nested namespaces. You can shorten the name such as:

namespace x = very::weird::namespc::name;
namespace y = yabadabadoopdiedoo;