From 8c257b1754ed55280c39e69a9b83065f4ca7fc80 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 20 Sep 2011 11:53:03 +0200
Subject: Change query syntax to use . for composite and -> for object pointer
 access

Also make non-inverse query columns act as both an object pointer and a
normal column. The latter allows us to use natural expressions such as
query<employee>::employer.is_null ().
---
 odb/query.hxx | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/odb/query.hxx b/odb/query.hxx
index 82fb411..d89a4e6 100644
--- a/odb/query.hxx
+++ b/odb/query.hxx
@@ -23,6 +23,24 @@ namespace odb
   template <typename T, const char* table>
   struct pointer_query_columns;
 
+  // Object pointer syntax wrapper.
+  //
+  template <typename T>
+  struct query_pointer
+  {
+    query_pointer ()
+    {
+      // For some reason GCC needs this dummy c-tor if we make a static
+      // data member of this type const.
+    }
+
+    T*
+    operator-> () const
+    {
+      return 0; // All members in T are static.
+    }
+  };
+
   //
   //
   template <typename T, class_kind kind = class_traits<T>::kind>
-- 
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