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Fusion: mask fusion::begin/fusion::end with SFINAE, fixes #4028

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[SVN r67352]
This commit is contained in:
Christopher Schmidt
2010-12-19 18:35:52 +00:00
parent e8539e1165
commit c15dd57405
2 changed files with 24 additions and 4 deletions
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14
include/boost/fusion/sequence/intrinsic/begin.hpp
View File

@ -8,6 +8,8 @@
#define FUSION_BEGIN_04052005_1132 #define FUSION_BEGIN_04052005_1132
#include <boost/fusion/support/tag_of.hpp> #include <boost/fusion/support/tag_of.hpp>
#include <boost/fusion/support/is_sequence.hpp>
#include <boost/utility/enable_if.hpp>
namespace boost { namespace fusion namespace boost { namespace fusion
{ {
@ -57,14 +59,22 @@ namespace boost { namespace fusion
} }
template <typename Sequence> 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) begin(Sequence& seq)
{ {
return result_of::begin<Sequence>::call(seq); return result_of::begin<Sequence>::call(seq);
} }
template <typename Sequence> 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) begin(Sequence const& seq)
{ {
return result_of::begin<Sequence const>::call(seq); return result_of::begin<Sequence const>::call(seq);

14
include/boost/fusion/sequence/intrinsic/end.hpp
View File

@ -8,6 +8,8 @@
#define FUSION_END_04052005_1141 #define FUSION_END_04052005_1141
#include <boost/fusion/support/tag_of.hpp> #include <boost/fusion/support/tag_of.hpp>
#include <boost/fusion/support/is_sequence.hpp>
#include <boost/utility/enable_if.hpp>
namespace boost { namespace fusion namespace boost { namespace fusion
{ {
@ -57,14 +59,22 @@ namespace boost { namespace fusion
} }
template <typename Sequence> 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) end(Sequence& seq)
{ {
return result_of::end<Sequence>::call(seq); return result_of::end<Sequence>::call(seq);
} }
template <typename Sequence> 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) end(Sequence const& seq)
{ {
return result_of::end<Sequence const>::call(seq); return result_of::end<Sequence const>::call(seq);