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using directives: qualified lookup rules are different from unqualifie...
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//clang 3.8.0 #include <iostream> namespace A { // To simplify this example, you can comment out this f. void f(int) { std::cout << "A::f()\n"; } namespace B { void f() { std::cout << "A::B::f()\n"; } } namespace C { using namespace B; void g() { f(); } // A::B::f, as A::f takes an int } } int main() { A::C::g(); // Calls A::B::f, because the QUALIFIED lookup rules for using directives // are totally different from the UNQUALIFIED lookup rules! A::C::f(); }
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Compilation time: 0.62 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,77 sec
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A::B::f() A::B::f()