19. The this keyword

Within a member function, the this keyword is a pointer to the current object.

Current object is the object through which the function was called.

Majority of member functions never use the this pointer, because its use within the function is implicit:

struct Rectangle {
    int width;  // member variable
    int height; // member variable
    char const* ptr_name;
    //...
    void set_name( char const* ptr_name_ )
    {
        // the use of the this keyword
        // is redundant and unnecessary:
        this->ptr_name = ptr_name_;
    }
    char const* get_name() const
    {
        // the use of the this keyword
        // is redundant and unnecessary:
        return this->ptr_name;
    }
    //...
};//struct Rectangle