From 1896d36996ab48ed7271e855d7e32b4e61f64896 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 23 Apr 2012 16:48:00 +0200
Subject: Polymorphic inheritance support

---
 odb/query.hxx | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'odb/query.hxx')

diff --git a/odb/query.hxx b/odb/query.hxx
index 0c748d6..e654ade 100644
--- a/odb/query.hxx
+++ b/odb/query.hxx
@@ -11,15 +11,26 @@
 
 namespace odb
 {
+  // Table alias for type T and alias tag Tag. The dummy third template
+  // argument is used to make the C++ compiler weed out duplicates.
   //
+  // The alias_traits interface consists of two things: the table_name
+  // static variable containing the name and, in case of a derived type
+  // in a polymorphic hierarchy, the base_traits typedef. Note that the
+  // same interface is exposed by object_traits, which is used when
+  // we need straight tables instead of aliases.
   //
+  //
+  template <typename T, typename Tag, bool dummy = true>
+  struct alias_traits;
+
   template <typename T>
   struct query_columns_base;
 
-  template <typename T, const char* table>
+  template <typename T, typename Alias>
   struct query_columns;
 
-  template <typename T, const char* table>
+  template <typename T, typename Alias>
   struct pointer_query_columns;
 
   // Object pointer syntax wrapper.
-- 
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