From 31fa329aa7424c1911cff3a6cdf09c97b2faf73e Mon Sep 17 00:00:00 2001
From: Daniel Wallin <daniel@boostpro.com>
Date: Wed, 13 Apr 2005 07:48:44 +0000
Subject: [PATCH] Fix for intel-win32-8_1 regression

[SVN r28204]
---
 include/boost/parameter/aux_/unwrap_cv_reference.hpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/boost/parameter/aux_/unwrap_cv_reference.hpp b/include/boost/parameter/aux_/unwrap_cv_reference.hpp
index 8841124..8a8bc58 100755
--- a/include/boost/parameter/aux_/unwrap_cv_reference.hpp
+++ b/include/boost/parameter/aux_/unwrap_cv_reference.hpp
@@ -40,6 +40,14 @@ struct is_cv_reference_wrapper
     typedef mpl::bool_<value> type;
 };
 
+// Needed for unwrap_cv_reference below. T might be const, so
+// eval_if might fail because of deriving from T const on EDG.
+template <class T>
+struct get_type
+{
+    typedef typename T::type type;
+};
+
 // Produces the unwrapped type to hold a reference to in named<>
 // Can't use boost::unwrap_reference<> here because it
 // doesn't handle the case where T = reference_wrapper<U> cv
@@ -48,7 +56,7 @@ struct unwrap_cv_reference
 {
     typedef typename mpl::eval_if<
         is_cv_reference_wrapper<T>
-      , T
+      , get_type<T>
       , mpl::identity<T>
     >::type type;
 };