# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2014-10-03 06:56:57
# Node ID 4ed47a1b2d24899dd7f61ab31a6dd58637faf6cf
# Parent  70a0664008ea2dc485f2222cc3b7c5625c8751f4

generatorset: implement __nonzero__

This is necessary to become a real smartset.

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2741,6 +2741,11 @@ class _generatorset(object):
         self._genlist = baseset([])
         self._finished = False
 
+    def __nonzero__(self):
+        for r in self:
+            return True
+        return False
+
     def __contains__(self, x):
         if x in self._cache:
             return self._cache[x]