From a815b90fe870d6d740c91a60ec0633f8bc256337 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 4 Aug 2011 13:32:25 +0200
Subject: Add support for boost::optional and boost::shared_ptr as value
 wrappers

New test: boost/common/optional.
---
 odb/boost/optional/wrapper-traits.hxx | 59 +++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 odb/boost/optional/wrapper-traits.hxx

(limited to 'odb/boost/optional/wrapper-traits.hxx')

diff --git a/odb/boost/optional/wrapper-traits.hxx b/odb/boost/optional/wrapper-traits.hxx
new file mode 100644
index 0000000..04f4b55
--- /dev/null
+++ b/odb/boost/optional/wrapper-traits.hxx
@@ -0,0 +1,59 @@
+// file      : odb/boost/optional/wrapper-traits.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_BOOST_OPTIONAL_WRAPPER_TRAITS_HXX
+#define ODB_BOOST_OPTIONAL_WRAPPER_TRAITS_HXX
+
+#include <odb/pre.hxx>
+
+#include <boost/none.hpp>
+#include <boost/optional.hpp>
+
+#include <odb/wrapper-traits.hxx>
+
+namespace odb
+{
+  template <typename T>
+  class wrapper_traits< ::boost::optional<T> >
+  {
+  public:
+    typedef T wrapped_type;
+    typedef ::boost::optional<T> wrapper_type;
+
+    static const bool null_handler = true;
+    static const bool null_default = true;
+
+    static bool
+    get_null (const wrapper_type& o)
+    {
+      return !o;
+    }
+
+    static void
+    set_null (wrapper_type& o)
+    {
+      o = ::boost::none;
+    }
+
+    static const wrapped_type&
+    get_ref (const wrapper_type& o)
+    {
+      return *o;
+    }
+
+    static wrapped_type&
+    set_ref (wrapper_type& o)
+    {
+      if (!o)
+        o = T ();
+
+      return *o;
+    }
+  };
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_BOOST_OPTIONAL_WRAPPER_TRAITS_HXX
-- 
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