C++ The This Pointer Using the this Pointer to Differentiate Between Member Data and Parameters


Example

This is an actual useful strategy to differentiate member data from parameters... Lets take this example :

// Dog Class Example
#include <iostream>
#include <string>

using std::cout;
using std::endl;

/*
* @class Dog
*   @member name
*       Dog's name
*   @function bark
*       Dog Barks!
*   @function getName
*       To Get Private
*       Name Variable
*/
class Dog
{
 public:
    Dog(std::string name);
    ~Dog();
    void  bark() const;
    std::string  getName() const;
 private:
    std::string name;
};

Dog::Dog(std::string name)
{
    /*
    *  this->name is the
    *  name variable from 
    *  the class dog . and
    *  name is from the 
    *  parameter of the function
    */
    this->name = name; 
}

Dog::~Dog(){}

void Dog::bark() const
{
  cout << "BARK" << endl;   
}

std::string  Dog::getName() const
{
    return this->name;
}


int main()
{
    Dog dog("Max");
    cout << dog.getName() << endl;
    dog.bark();
}

You can see here in the constructor we execute the following:

this->name = name; 

Here , you can see we are assinging the parameter name to the name of the private variable from the class Dog(this->name) .

To see the output of above code : http://cpp.sh/75r7