On Thursday, October 1, 2015 at 2:58:15 PM UTC-5, William la Forge wrote:
>
> A value can have more than one form or implementation. For example, a
> String and a char array may both represent the same value. Most objects,
> for example, can be serialized. Changing the form of a value then is not a
> change of value. This is the idea behind lazy deserialization /
> reserialization.
>
>
> We can represent a data structure as a tree, where the values in the tree
> can be either the immutable value of the object or a read-only ByteBuffer
> holding the serialized form of the value, or both. Both forms can be held
> by nodes using atoms, so the form of the values can be changed without
> having to create a new tree. The value remains unchanged and the tree can
> be safely shared between threads.
>
I think we are on the same page to this point.
> Lazy deserialization comes after loading a map or vector from a
> ByteBuffer. Initially only the root exists, which holds only the
> ByteBuffer. As you access and alter the contents of the map or vector, the
> portions of the tree which are accessed are deserialized.
>
This is where I get confused. Are aatrees persistent structures (in the
functional programming sense, like Clojure's data structures) whose values
cannot be changed (although their internal representation ("form") may
change), or are they mutable? If they are persistent, what do you mean by
"alter the contents"?
Nathan Davis
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