From 15b1a95942518c84f8161c59820ea5d0e49a4e54 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 27 Apr 2012 11:36:43 +0200
Subject: Add support for NULL pointers to objects with composite object ids

---
 odb/common.hxx | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'odb/common.hxx')

diff --git a/odb/common.hxx b/odb/common.hxx
index bc45d00..082d78f 100644
--- a/odb/common.hxx
+++ b/odb/common.hxx
@@ -310,10 +310,17 @@ protected:
         member_path_, key_prefix_, (root_ != 0 && (root_id_ || root_op_)));
   }
 
+  bool
+  null () const
+  {
+    return (root_ != 0 && root_null_) || context::null (member_path_);
+  }
+
 private:
   semantics::data_member* root_; // Root member if traversing from a member.
   bool root_id_;                 // True if traversing root as object id.
   bool root_op_;                 // True if traversing root as object pointer.
+  bool root_null_;               // True if root is null-able.
 
 private:
   void
-- 
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