Constructors for creating 2d arrays

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  1. #1
    Let's do some coding! Welshy's Avatar
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    Constructors for creating 2d arrays

    Hey guys, been a while since ive posted on here.......had a break to take some exams, ANYWAY lets get straight to my problem

    I'm making a small minesweeper game, and i want the player to be able to select the size of the minefield, but the constructor is turning out to be a bit of a problem. The best i could come up with it below, but ill need to define i and j as ints, but i'd rather not create another two variables, is there a better way? thanks

    Code:
    int m_Height;
    int m_Width;
    Field(char field[int i][int j]);           // constructor
    char m_MineField[][];                      // minefield itself
    Code:
    Field(char field[i][j]): m_MineField[m_Width][m_Height](field[i][j])

  2. #2
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    Code:
    int m_Height;
    int m_Width;
    char **m_MineField;  
    m_MineField = new char*[m_Height];
    for(int i = 0; i < m+Height; ++i)
       m_MineField = new char[m_Width];
    look up declaring and using multidimensional arrays using dynamic memory for further details.
    You're only born perfect.

  3. #3
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    Use a two dimensional vector instead. It is easy to size to whatever size the user specifies.

  4. #4
    Let's do some coding! Welshy's Avatar
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    Oh didnt know you could use a 2d vector, thanks for that Daved.

    Before anyone calls me stupid, im learning incase you couldnt guess :P

  5. #5
    Registered User hk_mp5kpdw's Avatar
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    You can also use a templated grid structure/class:

    Code:
    template<int height=5,int width=5>
    struct grid
    {
        int data[height][width];
        grid()
        {
            // Initialize the grid
        }
        int GetWidth() const
        {
            return width;
        }
        int GetHeight() const
        {
            return height;
        }
        // Other member functions...
    };
    
    ...
    
    grid<> minefield1;       // Creates a default 5x5 minefield
    grid<10,20> minefield2;  // Creates a 10x20 minefield
    "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

  6. #6
    Let's do some coding! Welshy's Avatar
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    whoa i havent got onto templates yet, one step at a time, lol, cheers anyway

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