# HG changeset patch
# User Lucas Moscovicz <lmoscovicz@fb.com>
# Date 1394669986 25200
# Node ID 1d5d6f622b94907fdd1aabf6656d01ee1a925fca
# Parent  efb34b066e7ae59c3ee4fa1918f4aea01eece112
revset: made descgeneratorset a private class

This class is not supposed to be used outside revset.py since it only
wraps content that is used by baseset typed classes.

It only gets created by revset operations or private methods.

diff -r efb34b066e7a -r 1d5d6f622b94 mercurial/revset.py
--- a/mercurial/revset.py	Wed Mar 12 17:18:54 2014 -0700
+++ b/mercurial/revset.py	Wed Mar 12 17:19:46 2014 -0700
@@ -46,7 +46,7 @@
                     if parent != node.nullrev:
                         heapq.heappush(h, -parent)
 
-    return descgeneratorset(iterate())
+    return _descgeneratorset(iterate())
 
 def _revdescendants(repo, revs, followfirst):
     """Like revlog.descendants() but supports followfirst."""
@@ -2413,9 +2413,14 @@
         self._cache[x] = False
         return False
 
-class descgeneratorset(_generatorset):
-    """ Same structure as _generatorset but stops iterating after it goes past
+class _descgeneratorset(_generatorset):
+    """Wrap a generator of descending elements for lazy iteration
+
+    Same structure as _generatorset but stops iterating after it goes past
     the value when asked for membership and the element is not contained
+
+    This class does not duck-type baseset and it's only supposed to be used
+    internally
     """
     def __contains__(self, x):
         if x in self._cache: