# HG changeset patch
# User Lucas Moscovicz <lmoscovicz@fb.com>
# Date 2014-02-07 01:42:08
# Node ID 60c308b932ebd8a77f497ae285774fdced382eee
# Parent  6490f8385391b2035469d4661f590e62f087db34

revset: added basic operators to orderedlazyset

Now __and__ and __sub__ return orderedlazyset.

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2227,6 +2227,14 @@ class orderedlazyset(lazyset):
     def filter(self, l):
         return orderedlazyset(self, l, ascending=self._ascending)
 
+    def __and__(self, x):
+        return orderedlazyset(self, lambda r: r in x,
+                ascending=self._ascending)
+
+    def __sub__(self, x):
+        return orderedlazyset(self, lambda r: r not in x,
+                ascending=self._ascending)
+
 class generatorset(object):
     """Wrapper structure for generators that provides lazy membership and can
     be iterated more than once.