array of structs initialization - PLZ help...

This is a discussion on array of structs initialization - PLZ help... within the C++ Programming forums, part of the General Programming Boards category; I have a struct as a class member, and an array of these structs as another member. I am trying ...

  1. #1
    Vanya
    Guest

    Unhappy array of structs initialization - PLZ help...

    I have a struct as a class member, and an array of these structs as another member. I am trying to initialize the array in my class implementation file and it has been a nightmare so far. The weird thing is, that I can initialize an array of structs without a problem in a normal program, but when I try to do it for the class, I don't get a compiler error, but the struct variables remain uninitialized. Here is what I am doing:

    ...in tictactoe.h:
    class tictactwice : public game {

    public:
    // STATIC CONSTANTS
    static const int ROWS = 4;
    static const int COLUMNS = 4;
    // here is the struct
    struct boardIndex {
    int x;
    int y;
    };
    // here is the array
    struct boardIndex TRANSPOSITION[ROWS][COLUMNS];

    // CONSTRUCTOR
    tictactwice( );

    protected:
    .....bla bla
    private:
    .....bla
    };

    And I am initializing it in tictactoe.cxx like this:

    struct tictactwice::boardIndex TRANSPOSITION[tictactwice::ROWS][tictactwice::COLUMNS] = {{{2,3},{0,0},{1,2},{3,1}},
    {{1,1},{3,2},{2,0},{0,3}},
    {{3,0},{1,3},{0,1},{2,2}}
    {{0,2},{2,1},{3,3},{1,0}}};

    Making this thing compile gave me nightmares, and right after I got happy I discovered that even though it compiles, the structs inside the array do NOT get initialized. I am clueless at this point - I know that this method would work for simple struct and a simple array, but I guess the belonging to a class part messes it up somehow. I REALLY REALLY appreciate your help!

  2. #2
    Skunkmeister Stoned_Coder's Avatar
    Join Date
    Aug 2001
    Posts
    2,572
    make local struct and init it in your constructor then assign it to your member struct.
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

  3. #3
    Vanya
    Guest

    Sounds good, but how?

    I am not sure how to do this, a code example would be wonderful!!!

    I tried making what I thought to be a local struct, but then I get a compiler error when trying to assign a "local" array of this struct to the member array.

    Also, did you mean that I have to initialize the struct in the class constructor? I can't remember if structs can have constructors in c++...I am getting confused with what I read about constructors in c#...

    If you can give me an example of how to do this, it would be great!!

    Thanks so much,
    ~Vanya

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