From 10af4fc1e091e7f9402e40bcfb3130cb2a6f6629 Mon Sep 17 00:00:00 2001
From: Neil Groves <neil@grovescomputing.com>
Date: Tue, 29 Mar 2011 10:27:00 +0000
Subject: [PATCH] [boost][range] - Improve the forwarding of the functor, and
 provide a work-around for the breaking changes in VC10 for_each.

[SVN r70690]
---
 include/boost/range/algorithm/for_each.hpp | 67 +++++++++++++++++++++-
 1 file changed, 64 insertions(+), 3 deletions(-)

diff --git a/include/boost/range/algorithm/for_each.hpp b/include/boost/range/algorithm/for_each.hpp
index 714a06f..dc2221d 100755
--- a/include/boost/range/algorithm/for_each.hpp
+++ b/include/boost/range/algorithm/for_each.hpp
@@ -13,13 +13,52 @@
 #include <boost/range/begin.hpp>
 #include <boost/range/end.hpp>
 #include <boost/range/concepts.hpp>
+#include <boost/ref.hpp>
 #include <algorithm>
 
+#if BOOST_WORKAROUND(BOOST_MSVC, == 1600)
+#include <xutility>
+#endif
+
 namespace boost
 {
     namespace range
     {
 
+#if BOOST_WORKAROUND(BOOST_MSVC, == 1600)
+        namespace for_each_detail
+        {
+            template<typename Iterator, typename UnaryFunction>
+            inline UnaryFunction
+            for_each_impl(Iterator first, Iterator last, UnaryFunction fun,
+                          typename enable_if<
+                            is_reference_wrapper<UnaryFunction>,
+                            void
+                          >::type* = 0)
+            {
+                    typedef typename std::_Get_unchecked_type<Iterator>::type
+                                unchecked_iterator;
+
+                    unchecked_iterator unchecked_last = std::_Unchecked(last);
+                    for (unchecked_iterator unchecked_first = std::_Unchecked(first); first != last; ++first)
+                            fun.get()(*unchecked_first);
+
+                    return fun;
+            }
+
+            template<typename Iterator, typename UnaryFunction>
+            inline UnaryFunction
+            for_each_impl(Iterator first, Iterator last, UnaryFunction fn,
+                          typename disable_if<
+                            is_reference_wrapper<UnaryFunction>,
+                            void
+                          >::type* = 0)
+            {
+                return std::for_each(first, last, fn);
+            }
+        }
+#endif
+
 /// \brief template function for_each
 ///
 /// range-based version of the for_each std algorithm
@@ -30,7 +69,18 @@ template< class SinglePassRange, class UnaryFunction >
 inline UnaryFunction for_each(SinglePassRange & rng, UnaryFunction fun)
 {
     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
-    return std::for_each(boost::begin(rng),boost::end(rng),fun);
+    
+#if BOOST_WORKAROUND(BOOST_MSVC, == 1600)
+        return for_each_detail::for_each_impl<
+                typename range_iterator<SinglePassRange>::type,
+                UnaryFunction
+        >(boost::begin(rng), boost::end(rng), fun);
+#else
+    return std::for_each<
+        BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type,
+        UnaryFunction
+    >(boost::begin(rng),boost::end(rng),fun);
+#endif    
 }
 
 /// \overload
@@ -38,11 +88,22 @@ template< class SinglePassRange, class UnaryFunction >
 inline UnaryFunction for_each(const SinglePassRange& rng, UnaryFunction fun)
 {
     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
-    return std::for_each(boost::begin(rng), boost::end(rng), fun);
+    
+#if BOOST_WORKAROUND(BOOST_MSVC, == 1600)
+        return for_each_detail::for_each_impl<
+                typename range_iterator<const SinglePassRange>::type,
+                UnaryFunction
+        >(boost::begin(rng), boost::end(rng), fun);
+#else    
+    return std::for_each<
+        BOOST_DEDUCED_TYPENAME range_iterator<const SinglePassRange>::type,
+        UnaryFunction
+    >(boost::begin(rng), boost::end(rng), fun);
+#endif    
 }
 
     } // namespace range
     using range::for_each;
 } // namespace boost
 
-#endif // include guard
+#endif // include guard
\ No newline at end of file