# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Date 2013-01-02 00:40:42
# Node ID dd0b636b0b658546f9318d857a0f91e8f6587033
# Parent  c0c943ef4e5530c73c9c2302b552e4ce3cb4cd93

branchmap: add a copy method

If we want branchcache of different filter to collaborate, they need a simple
way to copy each other. This will ensure that each filtered have no side effect
on other filter level cache.

diff --git a/mercurial/branchmap.py b/mercurial/branchmap.py
--- a/mercurial/branchmap.py
+++ b/mercurial/branchmap.py
@@ -117,6 +117,9 @@ class branchcache(dict):
         except IndexError:
             return False
 
+    def copy(self):
+        """return an deep copy of the branchcache object"""
+        return branchcache(self, self.tipnode, self.tiprev, self.filteredhash)
 
     def write(self, repo):
         try: