[sorallll]

PHP Code:

ArrayList a = new ArrayList();
ArrayList b = new ArrayList();
ArrayList temp = a;
a = b;
b = temp; 


[Marttt]

Clone ?

[Earendil]

Originally Posted by sorallll PHP Code: ArrayList a = new ArrayList(); ArrayList b = new ArrayList(); ArrayList temp = a; a = b; b = temp;

You can't swap objects like you would be swapping primitives, because a = b doesn't copy the ArrayList, only copies the reference. Doing that would mess it up, the best thing to do is to modify the ArrayLists with the clone method:

PHP Code:

stock void SwapArrayLists(ArrayList a1, ArrayList a2)
{
    ArrayList buffer = a1.Clone();
    a1 = a2.Clone();
    a2 = buffer.Clone();
    delete buffer;
} 


[Dragokas]

The question is not clear.
if "a" and "b" are global variables, used everywhere in code without caching them (like in some statics), you don't need to swap Data, the method in sorallll post is completely safe to exchange the links only.
If links are additionally pre-cached somewhere, the Clone method is your case.

[sorallll]

Originally Posted by Dragokas The question is not clear. if "a" and "b" are global variables, used everywhere in code without caching them (like in some statics), you don't need to swap Data, the method in sorallll post is completely safe to exchange the links only. If links are additionally pre-cached somewhere, the Clone method is your case.

global variables

[Forgetest]

Treating handles as C pointers may help with your understanding.
In C given 2 pointers, swapping is simply changing what they points to.

But if you indeed want the contents of the two handles to be swapped:

1. Clone() doesn't help because you will eventually changing the pointer again
2. Instead you should fill both ArrayList with contents of the other cell by cell

Bet there's better algorithm but this should go as straight as it shows.

PHP Code:

void SwapADTArray(ArrayList a1, ArrayList a2)
{
    int blocksize = a1.BlockSize;
    if (blocksize != a2.BlockSize)
    {
        ThrowError("");
    }
    
    int len1, len2;
    len1 = a1.Length;
    len2 = a2.Length;
    
    ArrayList temp = a2.Clone(); // save a2 first
    
    a2.Resize(len1);
    
    for (int i = 0; i < len1; ++i) // copy a1 contents to a2
    {
        for (int j = 0; j < blocksize; ++j)
        {
            a2.Set(i, a1.Get(i, j), j);
        }
    }
    
    a1.Resize(len2);
    
    for (int i = 0; i < len2; ++i) // copy a2 contents to a1
    {
        for (int j = 0; j < blocksize; ++j)
        {
            a1.Set(i, temp.Get(i, j), j);
        }
    }
    
    delete temp;
}