From a5fe5b9378937a35fa7921c6ed62ec9efa059934 Mon Sep 17 00:00:00 2001
From: Krasimir Angelov <kr.angelov@gmail.com>
Date: Tue, 5 Sep 2017 09:46:43 +0200
Subject: added exprHash in the Haskell binding

---
 src/runtime/haskell-bind/PGF2.hsc | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/runtime/haskell-bind/PGF2.hsc')

diff --git a/src/runtime/haskell-bind/PGF2.hsc b/src/runtime/haskell-bind/PGF2.hsc
index 037145ee6..f2f1b4113 100644
--- a/src/runtime/haskell-bind/PGF2.hsc
+++ b/src/runtime/haskell-bind/PGF2.hsc
@@ -39,6 +39,7 @@ module PGF2 (-- * PGF
              mkFloat,unFloat,
              mkMeta,unMeta,
              mkCId,
+             exprHash,
              treeProbability,
 
              -- ** Types
@@ -323,6 +324,15 @@ treeProbability (PGF p _) (Expr c_expr touch1) =
     touch1
     return (realToFrac res)
 
+exprHash :: Int32 -> Expr -> Int32
+exprHash h (Expr c_expr touch1) =
+  unsafePerformIO $ do
+    h <- pgf_expr_hash (fromIntegral h) c_expr
+    touch1
+    return (fromIntegral h)
+
+    
+
 -----------------------------------------------------------------------------
 -- Graphviz
 
-- 
cgit v1.2.3