From: Hannu Niemistö <hannu.niemisto@semantum.fi>
Date: Wed, 7 Feb 2018 12:20:34 +0000 (+0200)
Subject: (refs #7751) Added orElseM
X-Git-Tag: v1.43.0~136^2~600^2
X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F29%2F1429%2F1;p=simantics%2Fplatform.git

(refs #7751) Added orElseM

Change-Id: I365c89a1d4ad60b1763854b6d6cd0a3a94e1ab49
---

diff --git a/bundles/org.simantics.scl.runtime/scl/Prelude.scl b/bundles/org.simantics.scl.runtime/scl/Prelude.scl
index 7e558bdc4..2be6ed745 100644
--- a/bundles/org.simantics.scl.runtime/scl/Prelude.scl
+++ b/bundles/org.simantics.scl.runtime/scl/Prelude.scl
@@ -1305,6 +1305,11 @@ orElse :: Maybe a -> (<e> a) -> <e> a
 orElse (Just x) _   = x
 orElse Nothing  def = def
 
+@inline
+orElseM :: Maybe a -> (<e> Maybe a) -> <e> Maybe a
+orElseM mx@(Just x) _   = mx
+orElseM Nothing     def = def
+
 /// Either ///
 
 """