Created
September 7, 2014 01:41
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fn rotate_right<A>(mut root: Nref<A>)-> Nref<A>{ //assumes root and leftofroot are some. I can't think of a way to take them as &ref Box<Node<A>> s, though, rightofleft might be None, and I need to be able to switch rightofleft with leftofroot. | |
let leftofroot = &mut root.unwrap().left; | |
let rightofleft = &mut root.unwrap().left.unwrap().right; | |
// transitions are as follows | |
// | root | leftofroot | rightofleft | -swap-> | |
// | leftofroot | root | rightofleft | -swap-> | |
// | leftofroot | rightofleft | root | | |
// left is now pointed by the previous owner of root[it is the new root of the tree cutting in question], left's right is now on the leftref of the old root, and the old root is the right child of the new root. That is the rotation we want. | |
swap(&mut root, leftofroot); | |
swap(leftofroot, rightofleft); | |
rightofleft.unwrap().update_deepness(); //the grid shows these will be some as long as the input requirements were met | |
root .unwrap().update_deepness(); | |
root | |
} |
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