From fd5ba96357002c0964453fea38ee6a813cf02826 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 2 Nov 2012 12:18:42 +0200
Subject: Rework query alias tag system

Now each object pointer or view-associated object with alias gets its
own unique tag.
---
 odb/query.hxx | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/odb/query.hxx b/odb/query.hxx
index d5d0a19..ffff7f7 100644
--- a/odb/query.hxx
+++ b/odb/query.hxx
@@ -12,8 +12,7 @@
 
 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.
+  // Table alias for type T and tag Tag.
   //
   // The alias_traits interface consists of two things: the table_name
   // static variable containing the name and, in case of a derived type
@@ -22,16 +21,16 @@ namespace odb
   // we need straight tables instead of aliases.
   //
   //
-  template <typename T, database_id DB, typename Tag, bool dummy = true>
+  template <typename T, database_id DB, typename Tag>
   struct alias_traits;
 
   template <typename T, database_id DB>
   struct query_columns_base;
 
-  template <typename T, database_id DB, typename Alias>
+  template <typename T, database_id DB, typename A>
   struct query_columns;
 
-  template <typename T, database_id DB, typename Alias>
+  template <typename T, database_id DB, typename A>
   struct pointer_query_columns;
 
   // Object pointer syntax wrapper.
-- 
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