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Apocalypse · Sep 6, 2001, 02:25 PM

Hello,

I am a little out of practice with my pure C (been working purely in the API a little too long) knowledge and this is causing me a problem. I am defining a type in my program to allow me to pass an integer array between objective-C methods.

In the header file, I say this:
<BLOCKQUOTE>code:<HR><pre> typedef int intArray[16][/code]
and then in the program I try to do this:
<BLOCKQUOTE>code:<HR><pre> tempBoard = theBoard;
[/code]
Where these are both type intArray (I even tried it when defining tempBoard as int tempBoard[16] ) but I get a compile error saying that they are incompatible types.

I know that this must be very simple but I can't remember what problems like this are caused by.

Please help,
Jeff.

[ 09-06-2001: Message edited by: Apocalypse ]

Note: Never try to edit a post that has code tags in it.

[ 09-06-2001: Message edited by: Apocalypse ]

LordJavac · Sep 6, 2001, 02:37 PM

I think you want something like:
<BLOCKQUOTE>code:<HR><pre>
typedef int[16] intArray;
[/code]

Apocalypse · Sep 6, 2001, 07:54 PM

No, that is not correct at all.

At another point in the program I do try to assign a value to a specific element of the type and that gives no error. Perhaps the problem is that you cannot define one array as equal to another. I don't know but I think that if I move each element at once, it might work.

Anyone know why this behavior is?

thanks,
Jeff.

coredump · Sep 7, 2001, 12:30 PM

Gotta love pointers.

If you want tempBoard to alias the memory occupied by theBoard do this:

int theBoard[16];
int *tempBoard;

tempBoard = theBoard;

If you want to copy the contents of theBoard to tempBoard do this:

int theBoard[16];
int tempBoard[16];

bcopy(theBoard, tempBoard, 16 * sizeof(int));
or
memcpy(tempBoard, theBoard, 16 * sizeof(int));