is it a kind of koenig look up?

Question

According to the article posted at http://wikistack.com/koenig-lookup-or-argument-dependent-lookup/ koenig look happens only in case of namespace. if it is true then how lookup happens in below case

#include<iostream>
using namespace std;

class foo {
public:
    friend void hello(foo obj) {
        cout << "hello\n";
    }
};

int main() {
    foo foo_obj;
    hello(foo_obj);
    return 0;
}

Note that ADL is also applicable for class templates, not only namespaces, see example: [https://godbolt.org/z/rmYDXq](https://godbolt.org/z/rmYDXq). Though the case in the question is not ADL. — Amir Kirsh, Jul 07 '20 at 14:59

score 1 · Answer 1 · answered Mar 03 '17 at 17:15

1

Making hello a friend of foo means that it's not actually a member of foo (despite its definition being inside of foo's definition). Its name is "injected" into the global namespace, which is how it's found inside of main.

answered Mar 03 '17 at 17:15

Jerry Coffin

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is it a kind of koenig look up?

1 Answers1