Thread: this->sucks

Nothing personal to *this or anything, but why exactly would you need to use this? I mean, if there's a member function, couldn't you just use the functions name? What advantage does this have?

wow, that's not very well thought out. "this" gives you the ability to tell someone else where you are. Imagine you are adding yourself to a list, you'ld use your pointer. Imagine you are giving a child object a "callback" pointer. You would give it your pointer. That is what "this" is for and not just to call your own member functions.

oh and...

you->suck

"this" is important because not everything should be done from outside an object.

Example one....

In windows programming, if you have a class that represents a window the on create might look something like this...

Code:

CreateWindow(blah blah blah, this); // This puts the pointer to you in the window callback

Then your callback will use the pointer to access the object You can use SetWindowLong to stick the pointer permanently in GWL_USERDATA


Example two.

if you want creation of an object to store that instance in a global list for instance. The only way for a constructor to put himself in a list is to have access to his own pointer. Something like this:

Code:

ClassName::ClassName()
   {
   g_list.Add(this);
   }

ClassName::~ClassName()
   {
   g_list.Remove(this);
   }

It's pretty simple actually. "this" is necessary.