Using the this pointer : this « Class « C++ Tutorial

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#include <iostream>
 
 class Rectangle
 {
 public:
     Rectangle();
     ~Rectangle();
     void SetLength(int length) { this->itsLength = length; }
     int GetLength() const { return this->itsLength; }
     void SetWidth(int width) { itsWidth = width; }
     int GetWidth() const { return itsWidth; }
 
 private:
     int itsLength;
     int itsWidth;
 };
 
 Rectangle::Rectangle()
 {
     itsWidth = 5;
     itsLength = 10;
 }
 
 Rectangle::~Rectangle()
 {}
 
 int main()
 {
     Rectangle theRect;
     std::cout << "theRect is " << theRect.GetLength() 
               << " feet long.\n";
     std::cout << "theRect is " << theRect.GetWidth() 
               << " feet wide.\n";
 
     theRect.SetLength(20);
     theRect.SetWidth(10);
     std::cout << "theRect is " << theRect.GetLength()
               << " feet long.\n";
     std::cout << "theRect is " << theRect.GetWidth()
               << " feet wide.\n";
 
     return 0;
 }

theRect is 10 feet long.
theRect is 5 feet wide.
theRect is 20 feet long.
theRect is 10 feet wide.