Constructor being called in another constructor compiler error

**elsparko** · 05-18-2010

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

**jimblumberg** · 05-18-2010

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()...

**elsparko** · 05-18-2010

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

**jeffcobb** · 05-18-2010

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..

**elsparko** · 05-18-2010

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

**elsparko** · 05-18-2010

problem solved

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

thanks for all the help everybody

**grumpy** · 05-19-2010

OK. But can you explain why that worked? If you can't, you have been lucky, and have not actually solved the problem.

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