Merge from trunk

[SVN r79274]

include/boost/fusion/support/as_const.hpp

@@ -0,0 +1,26 @@
+/*=============================================================================
+    Copyright (c) 2012 Nathan Ridge
+
+    Distributed under 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 BOOST_FUSION_SUPPORT_AS_CONST_HPP
+#define BOOST_FUSION_SUPPORT_AS_CONST_HPP
+
+namespace boost { namespace fusion { namespace extension
+{
+    // A customization point that allows certain wrappers around
+    // Fusion sequence elements (e.g. adt_attribute_proxy) to be
+    // unwrapped in contexts where the element only needs to be
+    // read. The library wraps accesses to Fusion elements in
+    // such contexts with calls to this function. Users can
+    // specialize this function for their own wrappers.
+    template <typename T>
+    const T& as_const(const T& obj)
+    {
+        return obj;
+    }
+
+}}}
+
+#endif

include/boost/fusion/support/is_segmented.hpp

@@ -7,6 +7,7 @@
 #if !defined(FUSION_IS_SEGMENTED_03202006_0015)
 #define FUSION_IS_SEGMENTED_03202006_0015
 
+#include <boost/mpl/bool.hpp>
 #include <boost/fusion/support/tag_of.hpp>
 
 namespace boost { namespace fusion 
@@ -41,8 +42,10 @@ namespace boost { namespace fusion
     {
         template <typename Sequence>
         struct is_segmented
-          : extension::is_segmented_impl<typename traits::tag_of<Sequence>::type>::
-                template apply<Sequence>
+          : mpl::bool_<
+                (bool)extension::is_segmented_impl<typename traits::tag_of<Sequence>::type>::
+                    template apply<Sequence>::type::value
+            >
         {
         };
     }

include/boost/fusion/support/is_sequence.hpp

@@ -59,9 +59,11 @@ namespace boost { namespace fusion
     {
         template <typename T>
         struct is_sequence
-          : extension::is_sequence_impl<
+          : mpl::bool_<
+                (bool)extension::is_sequence_impl<
                 typename fusion::detail::tag_of<T>::type
-            >::template apply<T>
+                >::template apply<T>::type::value
+            >
         {};
 
         template <typename Sequence, typename Enable = void>

include/boost/fusion/support/is_view.hpp

@@ -7,6 +7,7 @@
 #if !defined(FUSION_IS_VIEW_03202006_0015)
 #define FUSION_IS_VIEW_03202006_0015
 
+#include <boost/mpl/bool.hpp>
 #include <boost/fusion/support/detail/is_view.hpp>
 #include <boost/fusion/support/tag_of.hpp>
 
@@ -54,8 +55,10 @@ namespace boost { namespace fusion
     {
         template <typename T>
         struct is_view :
-            extension::is_view_impl<typename fusion::detail::tag_of<T>::type>::
-                template apply<T>::type
+            mpl::bool_<
+                (bool)extension::is_view_impl<typename fusion::detail::tag_of<T>::type>::
+                    template apply<T>::type::value
+            >
         {};
     }
 }}