From ca6ab8a1a4eedf6f751f5ba2205cd57ca37fad80 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 5 Apr 2013 12:26:02 +0200
Subject: Allow no-op node-based traversers

Useful for overrides.
---
 odb/traversal/relational/elements.hxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/odb/traversal/relational/elements.hxx b/odb/traversal/relational/elements.hxx
index 0e1a983..611318a 100644
--- a/odb/traversal/relational/elements.hxx
+++ b/odb/traversal/relational/elements.hxx
@@ -81,6 +81,8 @@ namespace traversal
     struct node: compiler::traverser_impl<X, semantics::relational::node>,
       virtual node_base
     {
+      virtual void
+      traverse (X&) {}
     };
 
     template <typename X>
-- 
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