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Thread: dynamic_cast on class inherit from QGraphicsItem

  1. #1
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    Default dynamic_cast on class inherit from QGraphicsItem

    Hello Guys, first i want sorry for my english
    I create class "Item", and that class inherit from QGraphicsItem.
    I use scene()->collidingItems(this) to detect collisions, i want to know what objects colide, and use metod frome that object. So i do something like this:

    QList<QGraphicsItem *> list;
    list = scene()->collidingItems(this);

    And now (please help me) how can I use metod from Item class, when list is QGraphiscItem? I try to use dynamic_cast, but i always get error "C2680: 'Item' : invalid target type for dynamic_cast target type must be a pointer or reference to a defined class" , maybe I do all wrong...
    I hope that You understand me

  2. #2
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    Default Re: dynamic_cast on class inherit from QGraphicsItem

    You might be missing the "*" in the cast type.
    Is it complaining on this?
    Qt Code:
    1. Item *i = dynamic_cast<Item*>(list.at(0));
    2. if (i) {
    3. // you have a pointer to an Item
    4. }
    To copy to clipboard, switch view to plain text mode 

  3. The following user says thank you to ChrisW67 for this useful post:

    Rogagol (4th February 2016)

  4. #3
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    Default Re: dynamic_cast on class inherit from QGraphicsItem

    Now it works!
    I was sure, that i tried with "*"
    Thx for qiuck reply.
    Last edited by Rogagol; 4th February 2016 at 22:39.

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