Disabled default construction for iterator archetypes that are not forward traversal iterators

[SVN r21781]

test/Jamfile

@@ -36,6 +36,7 @@ test-suite iterator
     [ run iterator_adaptor_cc.cpp ]
     [ run iterator_adaptor_test.cpp ]
     [ compile iterator_archetype_cc.cpp ]
+    [ compile-fail iterator_archetype_default_ctor.cpp ]
     [ run transform_iterator_test.cpp ]
     [ run indirect_iterator_test.cpp ]
     [ compile indirect_iterator_member_types.cpp ]

test/iterator_archetype_default_ctor.cpp

@@ -0,0 +1,22 @@
+//
+// Copyright Thomas Witt 2004. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+//
+#include <boost/iterator/iterator_archetypes.hpp>
+
+
+int main()
+{
+  typedef boost::iterator_archetype<
+      int
+    , boost::iterator_archetypes::readable_iterator_t
+    , boost::single_pass_traversal_tag
+    > iter;
+
+  // single_pass_traversal iterators are not required to be
+  // default constructible
+  iter it;
+}