c 2b 2b namespace

1#include <iostream>
2using namespace std;
3
4
5int main() {
6    cout<< "Hello World" ; 
7}
8
9//If you are a web developer, please give https://code.ionicbyte.com/ a try

1namespace Parent
2{
3    inline namespace new_ns
4    {
5         template <typename T>
6         struct C
7         {
8             T member;
9         };
10    }
11     template<>
12     class C<int> {};
13}
14

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