--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cbc/atton-master-meta-sample.agda	Fri Feb 03 02:20:25 2017 +0000
@@ -0,0 +1,76 @@
+module atton-master-meta-sample where
+
+open import Data.Nat
+open import Data.Unit
+open import Function
+Int = ℕ
+
+record Context : Set where
+  field
+    a  : Int
+    b  : Int
+    c  : Int
+
+open import subtype Context as N
+
+record Meta : Set where 
+  field
+    context : Context
+    c'      : Int
+    next    : N.CodeSegment Context Context
+
+open import subtype Meta as M
+
+instance
+  _ : N.DataSegment Context
+  _ = record { get = id ; set = (\_ c -> c) }
+  _ : M.DataSegment Context
+  _ = record { get = (\m -> Meta.context m)  ;
+               set = (\m c -> record m {context = c}) }
+  _ : M.DataSegment Meta
+  _ = record { get = id ; set = (\_ m -> m) }
+
+
+liftContext : {X Y : Set} {{_ : N.DataSegment X}} {{_ : N.DataSegment Y}} -> N.CodeSegment X Y -> N.CodeSegment Context Context
+liftContext {{x}} {{y}} (N.cs f) = N.cs (\c -> N.DataSegment.set y c (f (N.DataSegment.get x c)))
+
+liftMeta : {X Y : Set} {{_ : M.DataSegment X}} {{_ : M.DataSegment Y}} -> N.CodeSegment X Y -> M.CodeSegment X Y
+liftMeta (N.cs f) = M.cs f
+
+
+gotoMeta : {I O : Set} {{_ : N.DataSegment I}} {{_ : N.DataSegment O}} -> M.CodeSegment Meta Meta -> N.CodeSegment I O -> Meta -> Meta
+gotoMeta mCode code m = M.exec mCode (record m {next = (liftContext code)})
+
+push : M.CodeSegment Meta Meta
+push = M.cs (\m -> M.exec (liftMeta (Meta.next m)) (record m {c' = Context.c (Meta.context m)}))
+
+
+record ds0 : Set where
+  field
+    a : Int
+    b : Int
+
+record ds1 : Set where
+  field
+    c : Int
+
+instance
+  _ : N.DataSegment ds0
+  _ = record { set = (\c d -> record c {a = (ds0.a d) ; b = (ds0.b d)})
+             ; get = (\c ->   record { a = (Context.a c) ; b = (Context.b c)})}
+  _ : N.DataSegment ds1
+  _ = record { set = (\c d -> record c {c = (ds1.c d)})
+             ; get = (\c ->   record { c = (Context.c c)})}
+
+cs2 : N.CodeSegment ds1 ds1
+cs2 = N.cs id
+
+cs1 : N.CodeSegment ds1 ds1
+cs1 = N.cs (\d -> N.goto cs2 d)
+
+cs0 : N.CodeSegment ds0 ds1
+cs0 = N.cs (\d -> N.goto cs1 (record {c = (ds0.a d) + (ds0.b d)}))
+
+
+main : Meta
+main = gotoMeta push cs0 (record {context = (record {a = 100 ; b = 50 ; c = 70}) ; c' = 0 ; next = (N.cs id)})