CPP Advance Methods

Advance Methods and functions

• In C++ you can create several methods in a class with the same name. We says that these methods overload each other.
  
• The class destructor method is the only one that cannot be overloaded.
  
• C++ require that those methods must differ in their parameter list with a different type of parameter, a different number of parameters or both.
  Overload Method example:
  

  Source code

  Result

  #include <iostream> class Sylinder { public: // example of overloaded Constructors Sylinder(int radius,int height ) { this->radius = radius; this->height = height; } // Constructor with no parameter // is called default Constructor Sylinder() { radius=2; height=5; } ~Sylinder() {} // example of overloaded methods; setRadius void setRadius(Sylinder & sylinder) { setRadius(sylinder.getRadius()); } void setRadius(int radius) {this->radius = radius;} int getRadius() const {return radius; } void setHeight(int height) {this->height = height;} int getHeight() {return height;} // Using default values void setRadiusAndHeight(int radius,int height=40 ) { this->radius = radius; this->height = height; } private: int radius; int height; }; using namespace std; int main(){ Sylinder * pSyl = new Sylinder; cout << "pSyl radius: " << pSyl->getRadius() << " meter" << endl; pSyl->setRadius(10); cout << "pSyl radius: " << pSyl->getRadius() << " meter" << endl; Sylinder newSyl(4,20); pSyl->setRadius(newSyl); cout << "pSyl radius: " << pSyl->getRadius() << " meter" << endl; return 0; }

  pSyl radius: 2 meter pSyl radius: 10 meter pSyl radius: 4 meter

  
  
• Methods can as Function also have default values after the same rules as for functions. An example is shown in the Source code above for the setRadiusAndHeight method.
  
• Constructors are invoked in two stages: the initialization stage and the body.