/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <iostream>

namespace X {
    template<typename T> void f(T);
}

namespace N {
    using namespace X;
    enum E { e1 };
    void f(E) { 
        std::cout << "N::f(N::E) called\n"; 
    }
}

void f(int) 
{ 
    std::cout << "::f(int) called\n"; 
}

int main() 
{
    ::f(N::e1);  // qualified function name: no ADL
    f(N::e1);    // ordinary lookup finds ::f() and ADL finds N::f(),
}                //  the latter is preferred