C++ this pointer

Pointer

• this
  It’s a pointer
  You can use keyword “this” to refer to this instance inside a class definition.
  One of the main usage of keyword this is to resolve ambiguity between the names of data member and function parameter. For example,

class Circle {
private:
   double radius;                 // Member variable called "radius"
   ......
public:
   void setRadius(double radius) { // Function's argument also called "radius"
      this->radius = radius;
         // "this.radius" refers to this instance's member variable
         // "radius" resolved to the function's argument.
   }
   ......
}

Return the reference of the object (return this), 套娃