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trie
Trie.Intf
type path
type of path point
type 'a node
type of trie node
val create : 'a option -> 'a node
create a new trie tree with an optional element
val get : 'a node -> path -> 'a option
returns the value associated with the path
val set : 'a node -> path -> 'a -> unit
associate the value with the path
val unset : 'a node -> path -> unit
remove an association of the path
val sub : 'a node -> path -> 'a node option
returns the sub node associated with the path
val is_leaf : 'a node -> bool
returns whether the node is a leaf of the tree