Class and <vector>

This is a discussion on Class and <vector> within the C++ Programming forums, part of the General Programming Boards category; Let's say I have the following code: Code: class myClass { private: int x, y; public: myClass(); myClass(int t_x, int ...

  1. #1
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    Question Class and <vector>

    Let's say I have the following code:
    Code:
    class myClass {
      private:
        int x, y;
      public:
        myClass();
        myClass(int t_x, int t_y) { x = t_x; y = t_y; }
       ~myClass();
    };
    
    myClass aClass;
    vector<myClass> vClass;
    Ok, now here's what I am trying to accomplish. I have this loop with a keypress condition check. When the user presses the key, I want to push_back an entry to vClass with a set x and y value. The closest I got was a miserable crash with no error message when I pushed the key.

    No need to worry about the key condition stuff since I got that taken care of already. I just need some help on how to manage with the vector as described.

    Something like this, but of course it does not work:
    Code:
    vClass.push_back(aClass(2, 4))
    If this could done more efficiently, great.

    Thanks.

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    This should work:
    Code:
    vClass.push_back(myClass(2, 4));
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

  3. #3
    Code Goddess Prelude's Avatar
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    >vClass.push_back(aClass(2, 4))
    aClass is an object, not a class. When you do this, the compiler searches for an overloaded () operator because you are effectively trying to call an object as a function. Because you don't have operator() in your class definition, it won't work. I think you really want to create a new object and store it in the vector, so you would want to call a constructor instead:
    Code:
    vClass.push_back(myClass(2, 4));
    My best code is written with the delete key.

  4. #4
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    Thumbs up

    Quote Originally Posted by hk_mp5kpdw
    This should work:
    Code:
    vClass.push_back(myClass(2, 4));
    Thanks hk_mp5kpdw, worked like a charm. Thank you for the explaination Prelude, I can see why it boogered out on me now.

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