Constructor being called in another constructor compiler error

This is a discussion on Constructor being called in another constructor compiler error within the C++ Programming forums, part of the General Programming Boards category; Hi again. I'm getting a strange compiler error that I just can't figure out how to fix. the error reads ...

  1. #1
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    Constructor being called in another constructor compiler error

    Hi again.

    I'm getting a strange compiler error that I just can't figure out how to fix.

    the error reads

    error: no matching function for call to ‘Position::Position()’

    heres some of the offending code

    Code:
    food::food()
        {
            ImageFile("../Assets/node3.tga").load(foodImage_);
        }
    this structure is located in a different file, but is global

    Code:
    struct Position
    {
        int x_;
        int y_;
        Position(int x,int y) : x_(x), y_(y){}
    };
    as you can see, Position is a structure, so there isn't a constructor for it, and it doesn't link into the food constructor in any way.

    what could be causing this?

    If more code is needed to diagnose the problem, just say and I shall provide it

    Thanks

    ES

  2. #2
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    There is a constructor for Position in your code
    Code:
      Position(int x,int y) : x_(x), y_(y){}
    but there is no constructor with an empty parameter list Position()...

  3. #3
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    Well I changed the food constructor to this

    Code:
     food::food(int x = 0, int y = 0)
        {
            ImageFile("../Assets/node3.tga").load(foodImage_);
        }
    I'm still getting the same error, but it is progressing further in the compilation process, so i guess that's a start

  4. #4
    Registered User jeffcobb's Avatar
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    No. Is the food class/struct somehow related to the Position class/struct? If not then changing food will have zero impact on Position. Perhaps you should post more of your code so we can see how food and Position interact...it *looks* like somewhere you are creating an instance of Position like:
    Code:
    Position somePosition;
    This would result in the compiler looking for ctor (constructor) for Position that looks like:
    Code:
    Position::Position()
    {
         // foo
    }
    But w/o more code that is only a guess..
    C/C++ Environment: GNU CC/Emacs
    Make system: CMake
    Debuggers: Valgrind/GDB

  5. #5
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    erm, ok

    here's the header file for the food class

    Code:
    class food {
    
        //Attributes
    
        protected:
    
        int type_;
        Image foodImage_;
        int foodcount_;
        Position foodpositions_[5];
    
    
    
        //Operations
    
        public:
                food(int x , int y);
    
        //checks the food count attribute to see if food can be spawned
        void checkfoodamount();
    
        //sets the position for the newly spawned food
        void setposition(int newx, int newy);
    
        //gets the positions of the food that is currently on the board
        void getpositions();
    
        //adds a piece of food
        void draw(Canvas &canvas);
    
    };
    Food does interact with position as there is an array of 5 position structures used to keep track of the food coordinates
    Last edited by elsparko; 05-18-2010 at 08:58 AM.

  6. #6
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    problem solved

    I added default values to the position structure and now it works like a charm

    thanks for all the help everybody

  7. #7
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    OK. But can you explain why that worked? If you can't, you have been lucky, and have not actually solved the problem.
    Right 98% of the time, and don't care about the other 3%.

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