#include <iostream>
namespace ns //::ns
{
void f() //::ns::f
{
std::cout << "::ns::f"<< std::endl;
}
namespace ns //::ns::ns
{
void f() //::ns::ns::f
{
std::cout << "::ns::ns::f"<< std::endl;
}
}
}
using namespace ns; //::ns
int main() //::main
{
::ns::f(); //::ns::f
::ns::ns::f(); //::ns::ns::f
f(); //::ns::f
ns::f(); //error, ambiguous
}
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