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author | ryokka |
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date | Mon, 19 Feb 2018 23:32:24 +0900 |
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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