From f4a26457ea30754e57e6adc82dd18c19572d3937 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 4 Feb 2015 17:23:53 +0200
Subject: Implement object loading views

See section 10.2 in the manual for details.
---
 odb/view-image.hxx | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 odb/view-image.hxx

(limited to 'odb')

diff --git a/odb/view-image.hxx b/odb/view-image.hxx
new file mode 100644
index 0000000..565a58b
--- /dev/null
+++ b/odb/view-image.hxx
@@ -0,0 +1,37 @@
+// file      : odb/view-image.hxx
+// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_VIEW_IMAGE_HXX
+#define ODB_VIEW_IMAGE_HXX
+
+#include <odb/pre.hxx>
+
+#include <odb/forward.hxx>
+#include <odb/traits.hxx>
+
+namespace odb
+{
+  // Helper to create a complete image chain for a polymorphic
+  // object hierarchy.
+  //
+  template <typename D, typename R, database_id DB>
+  struct view_object_image: object_traits_impl<D, DB>::image_type
+  {
+    view_object_image () {this->base = &base_;}
+
+  private:
+    // Data member names in the generated image_type never end with
+    // an underscore, so this name shouldn't clash.
+    //
+    view_object_image<typename object_traits_impl<D, DB>::base_type, R, DB>
+    base_;
+  };
+
+  template <typename R, database_id DB>
+  struct view_object_image<R, R, DB>: object_traits_impl<R, DB>::image_type {};
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_VIEW_IMAGE_HXX
-- 
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