From a83263748d108c392b6a861e2ce161c47eafa4e1 Mon Sep 17 00:00:00 2001
From: nobody <nobody@localhost>
Date: Tue, 6 Jan 2004 17:35:37 +0000
Subject: [PATCH] This commit was manufactured by cvs2svn to create branch
 'RC_1_31_0'.

[SVN r21515]
---
 include/boost/detail/is_incrementable.hpp | 71 +++++++++++++++++++++++
 include/boost/indirect_reference.hpp      | 40 +++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100755 include/boost/detail/is_incrementable.hpp
 create mode 100755 include/boost/indirect_reference.hpp

diff --git a/include/boost/detail/is_incrementable.hpp b/include/boost/detail/is_incrementable.hpp
new file mode 100755
index 0000000..3054ced
--- /dev/null
+++ b/include/boost/detail/is_incrementable.hpp
@@ -0,0 +1,71 @@
+// Copyright David Abrahams 2004. Use, modification and distribution is
+// subject to the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef IS_INCREMENTABLE_DWA200415_HPP
+# define IS_INCREMENTABLE_DWA200415_HPP
+
+# include <boost/type_traits/remove_cv.hpp>
+# include <boost/mpl/bool.hpp>
+# include <boost/detail/workaround.hpp>
+
+namespace boost { namespace detail { 
+
+// is_incrementable<T> metafunction
+//
+// Requires: Given x of type T&, if the expression ++x is well-formed
+// it must have complete type; otherwise, it must neither be ambiguous
+// nor violate access.
+
+// This namespace ensures that ADL doesn't mess things up.
+namespace is_incrementable_
+{
+  struct tag {};
+
+  // any soaks up implicit conversions and makes the following
+  // operator++ less-preferred than any other such operator which
+  // might be found via ADL.
+  struct any { template <class T> any(T const&); };
+  tag operator++(any const&);
+
+  // two check overloads help us identify which operator++ was picked
+  char (& check(tag) )[2];
+  
+  template <class T>
+  char check(T const&);
+  
+
+  template <class T>
+  struct
+# if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+  impl
+# else 
+  is_incrementable
+# endif 
+  {
+      static typename remove_cv<T>::type& x;
+
+      BOOST_STATIC_CONSTANT(
+          bool
+        , value = sizeof(is_incrementable_::check(++x)) == 1
+      );
+
+      typedef mpl::bool_<(
+# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+                             ::boost::detail::is_incrementable_::is_incrementable<T>::
+# endif 
+                             value)> type;
+  };
+}
+
+# if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+template <class T>
+struct is_incrementable : is_incrementable_::impl<T>
+{
+};
+# else
+using is_incrementable_::is_incrementable;
+# endif 
+
+}} // namespace boost::detail
+
+#endif // IS_INCREMENTABLE_DWA200415_HPP
diff --git a/include/boost/indirect_reference.hpp b/include/boost/indirect_reference.hpp
new file mode 100755
index 0000000..51fedb1
--- /dev/null
+++ b/include/boost/indirect_reference.hpp
@@ -0,0 +1,40 @@
+// Copyright David Abrahams 2004. Use, modification and distribution is
+// subject to the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef INDIRECT_REFERENCE_DWA200415_HPP
+# define INDIRECT_REFERENCE_DWA200415_HPP
+
+// dereferenceable_traits provides access to the value_type and
+// reference of a Dereferenceable type.
+
+# include <boost/detail/is_incrementable.hpp>
+# include <boost/iterator/iterator_traits.hpp>
+# include <boost/type_traits/remove_cv.hpp>
+# include <boost/mpl/apply_if.hpp>
+
+namespace boost { 
+
+namespace detail
+{
+  template <class P>
+  struct smart_ptr_reference
+  {
+      typedef typename P::element_type& type;
+  };
+}
+
+template <class P>
+struct indirect_reference
+{
+    typedef typename remove_cv<P>::type stripped;
+    
+    typedef typename mpl::apply_if<
+        detail::is_incrementable<stripped>
+      , iterator_reference<stripped>
+      , detail::smart_ptr_reference<stripped>
+    >::type type;
+};
+  
+} // namespace boost
+
+#endif // INDIRECT_REFERENCE_DWA200415_HPP