This is a discussion on "this" within the C++ Programming forums, part of the General Programming Boards category; Are there any uses for "this" besides cascading?...

  1. #1
    Registered User stautze's Avatar
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    Apr 2002


    Are there any uses for "this" besides cascading?
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  2. #2
    pronounced 'fib' FillYourBrain's Avatar
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    Aug 2002
    there are lots of uses for lots of different pointers. "this" is used so that you can internally figure out what your own pointer is. In COM you have a function called QueryInterface where there is a cast of the this pointer. looks something like this

    ptrtoreturn = (void*)(InterfaceName*)this;
    this is not exactly how they do it. They actually use static_cast but you get the idea. It's to get a pointer to a specific base class inside a void *. (in case you didn't know, base class pointers are actually a different address than the actual address)
    "You are stupid! You are stupid! Oh, and don't forget, you are STUPID!" - Dexter

  3. #3
    BMJ is offline
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    Aug 2002
    sure! As long as you understand what this is, you'll use it for all sorts of stuff
    if (!this->Head) {...}
    might be used in a linked list, for example.

  4. #4
    Magically delicious LuckY's Avatar
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    Oct 2001
    or another example: if a member function returns a reference or pointer to its own object.

    return *this;
    return this;

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