[Boost-commit] svn:boost r67352 - trunk/boost/fusion/sequence/intrinsic

Subject: [Boost-commit] svn:boost r67352 - trunk/boost/fusion/sequence/intrinsic
From: mr.chr.schmidt_at_[hidden]
Date: 2010-12-19 13:35:56

Author: cschmidt
Date: 2010-12-19 13:35:52 EST (Sun, 19 Dec 2010)
New Revision: 67352
URL: http://svn.boost.org/trac/boost/changeset/67352

Log:
Fusion: mask fusion::begin/fusion::end with SFINAE, fixes #4028
Text files modified: 
   trunk/boost/fusion/sequence/intrinsic/begin.hpp |    14 ++++++++++++--                          
   trunk/boost/fusion/sequence/intrinsic/end.hpp   |    14 ++++++++++++--                          
   2 files changed, 24 insertions(+), 4 deletions(-)

Modified: trunk/boost/fusion/sequence/intrinsic/begin.hpp
==============================================================================
--- trunk/boost/fusion/sequence/intrinsic/begin.hpp	(original)
+++ trunk/boost/fusion/sequence/intrinsic/begin.hpp	2010-12-19 13:35:52 EST (Sun, 19 Dec 2010)
@@ -8,6 +8,8 @@
 #define FUSION_BEGIN_04052005_1132
 
 #include <boost/fusion/support/tag_of.hpp>
+#include <boost/fusion/support/is_sequence.hpp>
+#include <boost/utility/enable_if.hpp>
 
 namespace boost { namespace fusion
 {
@@ -57,14 +59,22 @@
     }
 
     template <typename Sequence>
-    inline typename result_of::begin<Sequence>::type const
+    inline typename
+        lazy_enable_if<
+            traits::is_sequence<Sequence>
+          , result_of::begin<Sequence>
+        >::type const
     begin(Sequence& seq)
     {
         return result_of::begin<Sequence>::call(seq);
     }
 
     template <typename Sequence>
-    inline typename result_of::begin<Sequence const>::type const
+    inline typename
+        lazy_enable_if<
+            traits::is_sequence<Sequence>
+          , result_of::begin<Sequence const>
+        >::type const
     begin(Sequence const& seq)
     {
         return result_of::begin<Sequence const>::call(seq);

Modified: trunk/boost/fusion/sequence/intrinsic/end.hpp
==============================================================================
--- trunk/boost/fusion/sequence/intrinsic/end.hpp	(original)
+++ trunk/boost/fusion/sequence/intrinsic/end.hpp	2010-12-19 13:35:52 EST (Sun, 19 Dec 2010)
@@ -8,6 +8,8 @@
 #define FUSION_END_04052005_1141
 
 #include <boost/fusion/support/tag_of.hpp>
+#include <boost/fusion/support/is_sequence.hpp>
+#include <boost/utility/enable_if.hpp>
 
 namespace boost { namespace fusion
 {
@@ -57,14 +59,22 @@
     }
 
     template <typename Sequence>
-    inline typename result_of::end<Sequence>::type const
+    inline typename
+        lazy_enable_if<
+            traits::is_sequence<Sequence>
+          , result_of::end<Sequence>
+        >::type const
     end(Sequence& seq)
     {
         return result_of::end<Sequence>::call(seq);
     }
 
     template <typename Sequence>
-    inline typename result_of::end<Sequence const>::type const
+    inline typename
+        lazy_enable_if<
+            traits::is_sequence<Sequence>
+          , result_of::end<Sequence const>
+        >::type const
     end(Sequence const& seq)
     {
         return result_of::end<Sequence const>::call(seq);