Initial implementation

1 files changed, 26 insertions, 0 deletions

diff --git a/odb/tracer/transaction.cxx b/odb/tracer/transaction.cxx
new file mode 100644
index 0000000..46309de
--- /dev/null
+++ b/odb/tracer/transaction.cxx
@@ -0,0 +1,26 @@
+// file      : odb/tracer/transaction.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/tracer/transaction.hxx>
+
+namespace odb
+{
+  namespace tracer
+  {
+    transaction& transaction::
+    current ()
+    {
+      // While the impl type can be of the concrete type, the transaction
+      // object can be created as either odb:: or odb::tracer:: type. To
+      // work around that we are going to hard-cast one two the other
+      // relying on the fact that they have the same representation and
+      // no virtual functions. The former is checked in the tests.
+      //
+      odb::transaction& b (odb::transaction::current ());
+      dynamic_cast<transaction_impl&> (b.implementation ());
+      return reinterpret_cast<transaction&> (b);
+    }
+  }
+}