#include <iostream>

// Here we define three different namespaces, each containing
// a function with the same identifier, 'f'. Namespaces allow
// us to distinguish between these functions and call each
// function separately.
//
// Any references to companies in this example refer
// specifically to the Terminator movie series and not
// to any existing company.
//
// com_cyberdyne
//  - A namespace for the company with the web address
//    www.cyberdyne.com.
//  - Using a reversed domain name is not required, but it is
//    one way to help ensure that a namespace identifier is
//    unique.
//
// com_cyberdyne::skynet
//  - A namespace for the Skynet project nested inside the
//    namespace com_cyberdyne.
//
// com_cyberdyne_skynet
//  - An alternative namespace identifier for the Skynet
//    project that does not use a nested namespace.
//
// Thus, the fully qualified names of the three functions are
//
//     com_cyberdyne::f
//     com_cyberdyne::skynet::f
//     com_cyberdyne_skynet::f
//
// Exercises:
//  1. Create a namespace that is associated with you personally.
//     You could use your uWaterloo User ID, which is guaranteed
//     to be unique within the University of Waterloo. For example,
//     if your User ID is 'uwuserid', you could use either
//
//         ca_uwaterloo::uwuserid
//
//     or
//
//         ca_uwaterloo_uwuserid
//
//     as a namespace.

// Function declaration
int main();

namespace com_cyberdyne {
  void f();

  namespace skynet {
    void f();
  }
}

namespace com_cyberdyne_skynet {
  void f();
}

// Function definitions
int main() {
  com_cyberdyne::f();
  com_cyberdyne::skynet::f();
  com_cyberdyne_skynet::f();

  return 0;
}

namespace com_cyberdyne {
  void f() {
    std::cout << "In com_cyberdyne" << std::endl;
  }

  namespace skynet {
    void f() {
      std::cout << "In com_cyberdyne::skynet" << std::endl;
    }
  }
}

namespace com_cyberdyne_skynet {
  void f() {
    std::cout << "In com_cyberdyne_skynet" << std::endl;
  }
}