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Namespace and template in C++

  1. Forget Code
  2. C++
  3. Namespace and template 
#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