design-patterns-cpp/facade/Facade.cpp

/*
 * C++ Design Patterns: Facade
 * Author: Jakub Vojvoda [github.com/JakubVojvoda]
 * 2016
 *
 * Source code is licensed under MIT licence
 * (for more details see LICENCE)
 *
 */

#include <iostream>

/*
 * Subsystems
 * implement more complex subsystem functionality
 * and have no knowledge of the facade
 */
class SubsystemA {
public:
  void suboperation() {
    std::cout << "Subsystem A method" << std::endl;
    // ...
  }
  // ...
};

class SubsystemB {
public:
  void suboperation() {
    std::cout << "Subsystem B method" << std::endl;
    // ...
  }
  // ...
};

class SubsystemC {
public:
  void suboperation() {
    std::cout << "Subsystem C method" << std::endl;
    // ...
  }
  // ...
};

/*
 * Facade
 * delegates client requests to appropriate subsystem object
 * and unified interface that is easier to use
 */
class Facade {
public:
  Facade() :
    subsystemA(), subsystemB(), subsystemC() {}

  void operation1() {
    subsystemA->suboperation();
    subsystemB->suboperation();
    // ...
  }

  void operation2() {
    subsystemC->suboperation();
    // ...
  }

  // ...

private:
  SubsystemA *subsystemA;
  SubsystemB *subsystemB;
  SubsystemC *subsystemC;
  // ...
};


int main()
{
  Facade *facade = new Facade();
  facade->operation1();
  facade->operation2();

  return 0;
}