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Separates the (basically) completed cw_tree implementation in a
separate module so we can spend time implementing graphics in main.
NOTE: nodes are now generated from a node allocator, which just wraps
around the vector. We also take an allocator and queue by reference
in the iterate procedure now.
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Seems to work!
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Recursive implementation with proper indenting!
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An index is a pointer, and they don't change if the vector decides to
reallocate internally unlike the bastardised pointers I was rolling up
before. This simplifies design a bit.
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The vector acts as an arena for the nodes to be allocated from, better
and faster than allocating each child on the heap individually.
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Pops an item off the queue and generate left and right children for it,
if those are empty. Then push those children into the queue for the
next iteration.
NOTE: Because we're using a queue, this does a breadth first
generation of the tree, which is what we want.
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Will be used in creating the cw tree.
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Let's just deal with simplified stuff anyway?
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Holds numerator and denominator. Can self simplify, but not
automatically.
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