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-rw-r--r--boost/fusion/algorithm/transformation/push_front.hpp9
1 files changed, 8 insertions, 1 deletions
diff --git a/boost/fusion/algorithm/transformation/push_front.hpp b/boost/fusion/algorithm/transformation/push_front.hpp
index d08ad27987..abe7faadea 100644
--- a/boost/fusion/algorithm/transformation/push_front.hpp
+++ b/boost/fusion/algorithm/transformation/push_front.hpp
@@ -10,6 +10,8 @@
#include <boost/fusion/support/detail/as_fusion_element.hpp>
#include <boost/fusion/view/joint_view/joint_view.hpp>
#include <boost/fusion/view/single_view/single_view.hpp>
+#include <boost/fusion/support/is_sequence.hpp>
+#include <boost/utility/enable_if.hpp>
namespace boost { namespace fusion
{
@@ -24,7 +26,12 @@ namespace boost { namespace fusion
}
template <typename Sequence, typename T>
- inline typename result_of::push_front<Sequence const, T>::type
+ inline
+ typename
+ lazy_enable_if<
+ traits::is_sequence<Sequence>
+ , result_of::push_front<Sequence const, T>
+ >::type
push_front(Sequence const& seq, T const& x)
{
typedef typename result_of::push_front<Sequence const, T> push_front;