make traits more flexible by splitting out node-related fragment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65690 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 6 deletions

diff --git a/include/llvm/ADT/ilist.h b/include/llvm/ADT/ilist.h
index 9a088fd71e..962a29d0ff 100644
--- a/include/llvm/ADT/ilist.h
+++ b/include/llvm/ADT/ilist.h
@@ -69,23 +69,31 @@ struct ilist_sentinel_traits {
   static void destroySentinel(NodeTy *N) { delete N; }
 };
 
-/// ilist_default_traits - Default template traits for intrusive list.
-/// By inheriting from this, you can easily use default implementations
-/// for all common operations.
+/// ilist_node_traits - A fragment for template traits for intrusive list
+/// that provides default node related operations.
 ///
 template<typename NodeTy>
-struct ilist_default_traits : ilist_nextprev_traits<NodeTy>,
-                              ilist_sentinel_traits<NodeTy> {
+struct ilist_node_traits {
   static NodeTy *createNode(const NodeTy &V) { return new NodeTy(V); }
   static void deleteNode(NodeTy *V) { delete V; }
 
   void addNodeToList(NodeTy *) {}
   void removeNodeFromList(NodeTy *) {}
-  void transferNodesFromList(ilist_default_traits & /*SrcTraits*/,
+  void transferNodesFromList(ilist_node_traits &    /*SrcTraits*/,
                              ilist_iterator<NodeTy> /*first*/,
                              ilist_iterator<NodeTy> /*last*/) {}
 };
 
+/// ilist_default_traits - Default template traits for intrusive list.
+/// By inheriting from this, you can easily use default implementations
+/// for all common operations.
+///
+template<typename NodeTy>
+struct ilist_default_traits : ilist_nextprev_traits<NodeTy>,
+                              ilist_sentinel_traits<NodeTy>,
+                              ilist_node_traits<NodeTy> {
+};
+
 // Template traits for intrusive list.  By specializing this template class, you
 // can change what next/prev fields are used to store the links...
 template<typename NodeTy>