# HG changeset patch
# User haftmann
# Date 1242654334 -7200
# Node ID a324d214009cdc69ef64f6d68bb1d074abe148a2
# Parent  7733125bac3c4b4ebdcac643d5f944eb9be8fc60
added Code_Index.int_of operation

diff -r 7733125bac3c -r a324d214009c src/HOL/Code_Index.thy
--- a/src/HOL/Code_Index.thy	Mon May 18 15:45:32 2009 +0200
+++ b/src/HOL/Code_Index.thy	Mon May 18 15:45:34 2009 +0200
@@ -256,18 +256,20 @@
   "n mod m = snd (div_mod_index n m)"
   unfolding div_mod_index_def by simp
 
-hide (open) const of_nat nat_of
-
-subsection {* ML interface *}
+definition int_of :: "index \<Rightarrow> int" where
+  "int_of = Nat.of_nat o nat_of"
 
-ML {*
-structure Index =
-struct
+lemma int_of_code [code]:
+  "int_of k = (if k = 0 then 0
+    else (if k mod 2 = 0 then 2 * int_of (k div 2) else 2 * int_of (k div 2) + 1))"
+  by (auto simp add: int_of_def mod_div_equality')
 
-fun mk k = HOLogic.mk_number @{typ index} k;
+lemma (in term_syntax) term_of_index_code [code]:
+  "Code_Eval.term_of k =
+    Code_Eval.termify (number_of :: int \<Rightarrow> int) <\<cdot>> Code_Eval.term_of_num (2::index) k"
+  by (simp only: term_of_anything)
 
-end;
-*}
+hide (open) const of_nat nat_of int_of
 
 
 subsection {* Code generator setup *}
@@ -325,12 +327,4 @@
   (OCaml "!((_ : int) < _)")
   (Haskell infix 4 "<")
 
-text {* Evaluation *}
-
-lemma [code, code del]:
-  "(Code_Eval.term_of \<Colon> index \<Rightarrow> term) = Code_Eval.term_of" ..
-
-code_const "Code_Eval.term_of \<Colon> index \<Rightarrow> term"
-  (SML "HOLogic.mk'_number/ HOLogic.indexT/ (IntInf.fromInt/ _)")
-
 end
diff -r 7733125bac3c -r a324d214009c src/HOL/Library/Code_Integer.thy
--- a/src/HOL/Library/Code_Integer.thy	Mon May 18 15:45:32 2009 +0200
+++ b/src/HOL/Library/Code_Integer.thy	Mon May 18 15:45:34 2009 +0200
@@ -5,7 +5,7 @@
 header {* Pretty integer literals for code generation *}
 
 theory Code_Integer
-imports Main
+imports Main Code_Index
 begin
 
 text {*
@@ -91,15 +91,17 @@
   (OCaml "Big'_int.lt'_big'_int")
   (Haskell infix 4 "<")
 
+code_const Code_Index.int_of
+  (SML "IntInf.fromInt")
+  (OCaml "Big'_int.big'_int'_of'_int")
+  (Haskell "toEnum")
+
 code_reserved SML IntInf
 code_reserved OCaml Big_int
 
 text {* Evaluation *}
 
-lemma [code, code del]:
-  "(Code_Eval.term_of \<Colon> int \<Rightarrow> term) = Code_Eval.term_of" ..
-
 code_const "Code_Eval.term_of \<Colon> int \<Rightarrow> term"
-  (SML "HOLogic.mk'_number/ HOLogic.intT")
+  (Eval "HOLogic.mk'_number/ HOLogic.intT")
 
 end
\ No newline at end of file