From 4eceea6c547240df49697f9d22ccaf4e9101b915 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 4 Jul 2011 17:53:47 +0200
Subject: Implement support for database operations callbacks

New object pragma: callback. New test: common/callback. New manual
section: 10.1.4, "callback".
---
 odb/sqlite/object-statements.hxx | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'odb/sqlite/object-statements.hxx')

diff --git a/odb/sqlite/object-statements.hxx b/odb/sqlite/object-statements.hxx
index 3ab627d..c181b17 100644
--- a/odb/sqlite/object-statements.hxx
+++ b/odb/sqlite/object-statements.hxx
@@ -377,6 +377,28 @@ namespace odb
 
       typedef std::vector<delayed_load> delayed_loads;
       delayed_loads delayed_;
+
+      // Delayed vectors swap guard. See the load_delayed_() function for
+      // details.
+      //
+      struct swap_guard
+      {
+        swap_guard (object_statements& os, delayed_loads& dl)
+            : os_ (os), dl_ (dl)
+        {
+          dl_.swap (os_.delayed_);
+        }
+
+        ~swap_guard ()
+        {
+          os_.clear_delayed ();
+          dl_.swap (os_.delayed_);
+        }
+
+      private:
+        object_statements& os_;
+        delayed_loads& dl_;
+      };
     };
   }
 }
-- 
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