From 25681f822f4a965ca38efa47eed9927b0edc75c7 Mon Sep 17 00:00:00 2001
From: Camil Staps
Date: Wed, 30 Mar 2016 10:54:45 +0200
Subject: Overloaded state, more boolean ops, unaliased Var

---
 README.md | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

(limited to 'README.md')

diff --git a/README.md b/README.md
index 0619e88..a69c119 100644
--- a/README.md
+++ b/README.md
@@ -17,23 +17,26 @@ For example, the [following program][sqrt] is a rounded down square root
 function (if `x=n` at the start and `n` is a natural number, then `z` is the
 square root of `n`, rounded down, after execution):
 
+    import While
+    from WhileVars import o, s, x, z // o :== Var 'o'; etc.
+
     sqrt :: Stm
-    sqrt = 'z' := 0 :.
-           'o' := 1 :.
-           's' := 1 :.
-           While ('s' <= 'x')
-             ( 'z' := 'z' + 1 :.
-               'o' := 'o' + 2 :.
-               's' := 's' + 'o' )
+    sqrt = z := 0 :.
+           o := 1 :.
+           s := 1 :.
+           While (s <= x)
+             ( z := z + 1 :.
+               o := o + 2 :.
+               s := s + o )
 
 ### Evaluation
-We can now execute this code on a `State`, which maps `Var` (`Char`) to `Int`:
+We can now execute this code on a `State`, which maps `Var` to `Int`:
 
     Start :: Int
-    Start = eval NS sqrt st 'z'
+    Start = eval NS sqrt st z
     where
-        st :: Var -> Int
-        st 'x' = 36
+        st :: Char -> Int  // Or: st :: Var -> Int  // st :: CharState
+        st 'x' = 9         //     st (Var 'x') = 9  // st = \'x' -> 9
 
 `eval NS sqrt st` is a `State` itself (the state that results from execution of
 `sqrt` in `st`), so we apply that to `z` to get the result. Other than the
@@ -135,8 +138,6 @@ qualified imports where needed.
 ## Todo
 
  - Gast testing
- - More boolean operators for testing integers besides `==` and `<=`
- - Can boolean operators be made functions rather than type constructors?
  - Prettyprint for `DerivTree`
  - Parser
  - Add the state to the `toString` of `DerivTree` and `DerivSeq`
-- 
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