Could not find implicit value for parameter ordering?

This compiles and it exhibits two variants, one using Ordered keys ( K ) and the other using an Ordering on the keys: package disttree { import scala.collection.immutable. TreeMap import scala.math. {Ordered, Ordering} // class BtreeK Compare(k1, k2) } abstract class Node extends TreeMapK,V class InnerNode extends Node class LeafNode extends Node val root = new InnerNode() def search(n: Node, key: K): Option(K,V) = { return n.

Find(_ == key) } def insert(key: K, value: V) { } def delete(key: K) { } } } import disttree. _; object Tester { def main(args: ListString) = { var t = new BtreeInt, Any(2) t. Insert(1, "goodbye") Console.

Println(t) } }.

This compiles and it exhibits two variants, one using Ordered keys (K) and the other using an Ordering on the keys: package disttree { import scala.collection.immutable. TreeMap import scala.math. {Ordered, Ordering} // class BtreeK Compare(k1, k2) } abstract class Node extends TreeMapK,V class InnerNode extends Node class LeafNode extends Node val root = new InnerNode() def search(n: Node, key: K): Option(K,V) = { return n.

Find(_ == key) } def insert(key: K, value: V) { } def delete(key: K) { } } } import disttree. _; object Tester { def main(args: ListString) = { var t = new BtreeInt, Any(2) t. Insert(1, "goodbye") Console.

Println(t) } }.

Common mistake. These are two different K's: class BtreeK :13: error: type mismatch; found : Btree#31335.this. DefaultOrder#31343.

Type (with underlying type object Btree#31335.this. DefaultOrder#31344) required: Ordering#3222K#31346 abstract class NodeK,V extends TreeMapK,V()(DefaultOrder) ^ Btree#31335.this. DefaultOrder#31343.

Type Ordering#11986K#31346? Scala.math. Ordering#11986K#31336 Ordering#11986K#31346?

K#31346.

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