Extended traits for values stored in containers to be exposed by the indexing suite

[SVN r1563]

include/boost/python/suite/indexing/value_traits.hpp

@@ -0,0 +1,45 @@
+// -*- mode:c++ -*-
+//
+// Header file value_traits.hpp
+//
+// Traits information about container element types for use in
+// determining which Python methods to support for a container.
+//
+// Copyright (c) 2003 Raoul M. Gough
+//
+// This material is provided "as is", with absolutely no warranty expressed
+// or implied. Any use is at your own risk.
+//
+// Permission to use or copy this material for any purpose is hereby
+// granted without fee, provided the above notices are retained on all
+// copies.  Permission to modify the material and to distribute modified
+// versions is granted, provided the above notices are retained, and a
+// notice that the material was modified is included with the above
+// copyright notice.
+//
+// History
+// =======
+// 2003/ 9/12	rmg	File creation
+//
+// $Id$
+//
+
+#ifndef value_traits_rmg_20030912_included
+#define value_traits_rmg_20030912_included
+
+namespace indexing {
+  template<typename T>
+  struct value_traits {
+    static bool const equality_comparable = true;
+    // Meaning from C++98 standard section 20.1.1
+
+    // static bool const has_less = true;
+    // etc...
+
+    // Default, do-nothing, version of visitor_helper
+    template<typename PythonClass, typename Policy>
+    static void visitor_helper (PythonClass &, Policy const &) { }
+  };
+}
+
+#endif // value_traits_rmg_20030912_included