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Need Help with a question

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Join Date: Jul 2008

Posts: 4

Reputation: sahmedsa is an unknown quantity at this point

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sahmedsa

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Newbie Poster

Need Help with a question

Aug 6th, 2008

I always see solutions to some questions regarding classes, and they have (*this) , I don't understand when to use it and how to use it. Does it just mean that we're referring to something? Please help me out. (an explaination with an example would be helpful)

Thanks

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Join Date: Oct 2007

Posts: 1,951

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Duoas

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Posting Virtuoso

Re: Need Help with a question

Aug 6th, 2008

this is a special pointer that points to the active object. For example:

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 C++ Syntax (Toggle Plain Text) 
#include <iostream>
#include <string>
using namespace std;
 
class WhoAmI
  {
    string name;
  public:
    WhoAmI( const string& name ): name( name ) { }
    void print( const WhoAmI& other )
      {
      cout << "I am " << this->name << endl;
      if (this == &other)
        cout << "I am beside myself.\n";
      else
        cout << "I am with " << other.name << endl;
      }
  };
 
int main()
  {
  WhoAmI george( "George" );
  WhoAmI alannah( "Alannah" );
 
  george.print( george );
  alannah.print( george );
 
  return 0;
  }
#include <iostream>
#include <string>
using namespace std;

class WhoAmI
  {
    string name;
  public:
    WhoAmI( const string& name ): name( name ) { }
    void print( const WhoAmI& other )
      {
      cout << "I am " << this->name << endl;
      if (this == &other)
        cout << "I am beside myself.\n";
      else
        cout << "I am with " << other.name << endl;
      }
  };

int main()
  {
  WhoAmI george( "George" );
  WhoAmI alannah( "Alannah" );

  george.print( george );
  alannah.print( george );

  return 0;
  }

Hope this helps.