Stanamic typing: Difference between revisions
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"We describe a datatype of polymorphic balanced binary trees: AVL trees. | |||
The trees are polymorphic: the values in different nodes may have | |||
different type. The trees are balanced: for each non-leaf node, the | |||
heights of its two children can differ at most by one. Here, by | |||
definition the height of a node is 1 + max of the heights of its | |||
children. A leaf node has the height of 0. | |||
The main feature of the present approach is a blended static and dynamic | |||
enforcement of the balancing constraint. The function make_node | |||
verifies the balancing constraint at compile time -- if it can. If the | |||
static check is not possible, the function delays the check till the | |||
run-time" | |||
[http://okmij.org/ftp/Haskell/types.html#stanamic-AVL Polymorphic stanamically balanced AVL trees] | |||
[[Category:Idioms]] | |||
Latest revision as of 15:19, 6 February 2021
"We describe a datatype of polymorphic balanced binary trees: AVL trees. The trees are polymorphic: the values in different nodes may have different type. The trees are balanced: for each non-leaf node, the heights of its two children can differ at most by one. Here, by definition the height of a node is 1 + max of the heights of its children. A leaf node has the height of 0.
The main feature of the present approach is a blended static and dynamic enforcement of the balancing constraint. The function make_node verifies the balancing constraint at compile time -- if it can. If the static check is not possible, the function delays the check till the run-time"