pointer to multidimensional array

This is a discussion on pointer to multidimensional array within the C++ Programming forums, part of the General Programming Boards category; I'm trying to use a pointer to access an array, since I need to be able to switch between two ...

  1. #1
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    pointer to multidimensional array

    I'm trying to use a pointer to access an array, since I need to be able to switch between two identically-sized arrays. However, I get compiler errors when I try to reference an array to my pointer. Here is a sample of the code that I have, hopefully someone can tell me what I'm doing wrong.

    Code:
    int grid[320][240];    //my array
    int *grid_ptr[][240];  //my pointer
    
    int doSomethingWithGrid(int array[][240]); //function prototype
    
    int main()
    {
        grid_ptr = &grid;    //assign pointer to grid, compile error
    
        doSomethingWithGrid(grid_ptr);  //func. wont take pointer
    }
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  2. #2
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    What errors do you get?

  3. #3
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    Quote Originally Posted by Bigbio2002
    I'm trying to use a pointer to access an array, since I need to be able to switch between two identically-sized arrays. However, I get compiler errors when I try to reference an array to my pointer. Here is a sample of the code that I have, hopefully someone can tell me what I'm doing wrong.

    Code:
    int grid[320][240];    //my array
    int *grid_ptr[][240];  //my pointer
    
    int doSomethingWithGrid(int array[][240]); //function prototype
    
    int main()
    {
        //error C2440: '=' : cannot convert from 'int [320][240]' to 'int *[][240]'
        grid_ptr = grid;    //assign pointer to grid, compile error
    
        //error C2664: 'doSomethingWithGrid' : cannot convert parameter from 'int *[][240]' to 'int [][240]'
        doSomethingWithGrid(grid_ptr);  //func. wont take pointer
    }
    ive modified my code slightly and inserted the errors before the lines they appear on. hope this helps.
    You say "Impressive!", but I already know it
    I'm a hardcore player and I'm not afraid to show it

  4. #4
    Just Lurking Dave_Sinkula's Avatar
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    Code:
    int grid[320][240];
    int (*grid_ptr)[240];
    
    int doSomethingWithGrid(int (*array)[240]);
    
    int main()
    {
       grid_ptr = grid;
       doSomethingWithGrid(grid_ptr);
    }
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  5. #5
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    aha, thank you!!
    You say "Impressive!", but I already know it
    I'm a hardcore player and I'm not afraid to show it

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