namespace c 2b 2b

1Namespace std::cout or cout <<

1//Header.h
2#include <string>
3
4namespace Test
5{
6    namespace old_ns
7    {
8        std::string Func() { return std::string("Hello from old"); }
9    }
10
11    inline namespace new_ns
12    {
13        std::string Func() { return std::string("Hello from new"); }
14    }
15}
16
17#include "header.h"
18#include <string>
19#include <iostream>
20
21int main()
22{
23    using namespace Test;
24    using namespace std;
25
26    string s = Func();
27    std::cout << s << std::endl; // "Hello from new"
28    return 0;
29}
30