--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/AgdaTree.agda	Tue Sep 08 18:38:08 2020 +0900
@@ -0,0 +1,22 @@
+record TreeMethods {n m : Level } {a : Set n } {t : Set m } (treeImpl : Set n ) : Set (m Level.⊔ n) where
+  field
+    putImpl : treeImpl -> a -> (treeImpl -> t) -> t
+    getImpl  : treeImpl -> (treeImpl -> Maybe a -> t) -> t
+open TreeMethods
+
+record Tree  {n m : Level } {a : Set n } {t : Set m } (treeImpl : Set n ) : Set (m Level.⊔ n) where
+  field
+    tree : treeImpl
+    treeMethods : TreeMethods {n} {m} {a} {t} treeImpl
+  putTree : a -> (Tree treeImpl -> t) -> t
+  putTree d next = putImpl (treeMethods ) tree d (\t1 -> next (record {tree = t1 ; treeMethods = treeMethods} ))
+  getTree : (Tree treeImpl -> Maybe a -> t) -> t
+  getTree next = getImpl (treeMethods ) tree (\t1 d -> next (record {tree = t1 ; treeMethods = treeMethods} ) d )
+open Tree
+
+record RedBlackTree {n m : Level } {t : Set m} (a k : Set n) : Set (m Level.⊔ n) where
+  field
+    root : Maybe (Node a k)
+    nodeStack : SingleLinkedStack  (Node a k)
+    compare : k -> k -> CompareResult {n}
+open RedBlackTree