Implement support for database operations callbacks

New object pragma: callback. New test: common/callback. New manual
section: 10.1.4, "callback".

1 files changed, 44 insertions, 0 deletions

diff --git a/odb/callback.hxx b/odb/callback.hxx
new file mode 100644
index 0000000..16d89ef
--- /dev/null
+++ b/odb/callback.hxx
@@ -0,0 +1,44 @@
+// file      : odb/callback.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_CALLBACK_HXX
+#define ODB_CALLBACK_HXX
+
+#include <odb/pre.hxx>
+
+#include <odb/details/export.hxx>
+
+namespace odb
+{
+  struct LIBODB_EXPORT callback_event
+  {
+    enum value
+    {
+      pre_persist,
+      post_persist,
+      pre_load,
+      post_load,
+      pre_update,
+      post_update,
+      pre_erase,
+      post_erase
+    };
+
+    callback_event (value v): v_ (v) {}
+    operator value () const {return v_;}
+
+  private:
+    value v_;
+  };
+
+  namespace core
+  {
+    using odb::callback_event;
+  }
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_CALLBACK_HXX