C++/Language/Using

Demonstrates the use of using-declarations and using-directives.

<source lang="cpp">

1. include <iostream>

void message() {

  std::cout << "Within function ::message()\n";

} namespace A {

  using namespace std; 
  void message()       
  {
    cout << "Within function A::message()\n";
  }

} namespace B {

  using std::cout;     
  void message(void);  

} void B::message(void) {

  cout << "Within function B::message()\n";

} int main() {

  using namespace std;  
  using B::message;     
  cout << "Testing namespaces!\n";
  cout << "\nCall of A::message()" << endl;
  A::message();
  cout << "\nCall of B::message()" << endl;
  message();           
  cout << "\nCall of::message()" << endl;
  ::message();         
  return 0;

}

      </source>