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Thread: Defining array elements as different types?

  1. Mar 2nd, 2002, 10:05 AM #1
    might
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    Post Defining array elements as different types?

    Is it possible to define an array`s different layers as different types, classes?
    I`m not sure but I think it may be done by templates, but how?
    Would you please make me know how to do this or if there is any other existing way.
    Thanks in advance.
    Last edited by might; Mar 3rd, 2002 at 05:15 AM.
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  2. Mar 2nd, 2002, 01:54 PM #2
    CornedBee
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    What are array layers?
    All the buzzt
    CornedBee

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  3. Mar 2nd, 2002, 03:40 PM #3
    kedaman
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    vector is an existing way, if you mean layers as in generic programming, check out the STL at sgi.com
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  4. Mar 3rd, 2002, 05:11 AM #4
    might
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    I couldn`t find the exact word, but I remember now : "element"
    If an array is defined as theArray[3] ;
    theArray[0] , theArray[1] , theArray[2] are the elements of theArray[3] , I think
    Sorry

    All I want to do is this:
    Suppose:


    class CLine {public: void DrawLine() {/*Draw a line*/}; };
    class CArc{public: void DrawArc() {/*Draw an arc*/}; };


    if an array has two elements Shapes[2]
    Define the element Shapes[0] as CLine and Shapes[1] as CArc
    How can this be possible? Or firstly, can this be possible?
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  6. Mar 3rd, 2002, 06:46 AM #5
    kedaman
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    It is called polymorphism, take a look at this tutorial
    http://newdata.box.sk/bx/c/
    Btw, you should also read the chapters before just to make sure you understand some other important concepts.
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  7. Mar 3rd, 2002, 08:31 AM #6
    might
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    Thanks a lot for your replies and interest , Kedaman, and also CornedBee for his interest.

    I know polymorphism, because I started learning C++ with the online version of Teach Yourself C++ in 21 Days.
    I have had the idea to use inheritance also. But to do this I have to create an empty base class that inherits CLine, CArc etc.

    But here has been a problem: I have been using Visual Studio .NET Beta 1 and mostly it doesn`t let me access to the members of an object (it usually forgets the mission of the " . " for objects and "->" for pointers to classes. )It`s just a weird. So it has always made me mistaken. I thought that I was doing something wrong, even I did right.

    Anyway, I will try polymorphism.

    Thank you very much, again.
    Last edited by might; Mar 3rd, 2002 at 08:36 AM.
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