From bbb153b9e576cdfdb59711f68d7f26a427a55041 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 12 Jan 2012 09:28:06 +0200
Subject: Query support for SQL Server

---
 odb/mssql/mssql-types.hxx | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'odb/mssql/mssql-types.hxx')

diff --git a/odb/mssql/mssql-types.hxx b/odb/mssql/mssql-types.hxx
index 43e6d6e..9f3d1be 100644
--- a/odb/mssql/mssql-types.hxx
+++ b/odb/mssql/mssql-types.hxx
@@ -141,6 +141,21 @@ namespace odb
                         // value 8 indicates the SMALLDATETIME type
                         // which has no seconds.
     };
+
+    // An instance of this structure specifies the function to invoke and
+    // the context to pass when the object/view image is about to be
+    // modified. This mechanism is used by the query machinery to save the
+    // image between result iteration and dereferencing if something gets
+    // executed between these two operations that would overwrite the
+    // image.
+    //
+    struct change_callback
+    {
+      change_callback (): callback (0), context (0) {};
+
+      void (*callback) (void*);
+      void* context;
+    };
   }
 }
 
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