# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2014-10-06 18:57:59
# Node ID 7f97cb12782f8f9c56317d033bb64de1e663735c
# Parent  88dad916c008f59e0c46540081f3e2e68d0ebe4f

addset: implement first and last methods

The implementation is non-lazy for now. One may want to make it more lazy in the
future.

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2618,6 +2618,16 @@ class addset(abstractsmartset):
         if self._ascending is not None:
             self._ascending = not self._ascending
 
+    def first(self):
+        if self:
+            return self._list.first()
+        return None
+
+    def last(self):
+        if self:
+            return self._list.last()
+        return None
+
 class generatorset(abstractsmartset):
     """Wrap a generator for lazy iteration