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diff --git a/include/boost/variant/detail/apply_visitor_unary.hpp b/include/boost/variant/detail/apply_visitor_unary.hpp
index 71610cb..c3a741e 100644
--- a/include/boost/variant/detail/apply_visitor_unary.hpp
+++ b/include/boost/variant/detail/apply_visitor_unary.hpp
@@ -23,6 +23,7 @@
# include <boost/mpl/size.hpp>
# include <boost/utility/declval.hpp>
# include <boost/core/enable_if.hpp>
+# include <boost/type_traits/copy_cv_ref.hpp>
# include <boost/type_traits/remove_reference.hpp>
# include <boost/variant/detail/has_result_type.hpp>
#endif
@@ -85,7 +86,7 @@ namespace detail { namespace variant {
// This class serves only metaprogramming purposes. none of its methods must be called at runtime!
template <class Visitor, class Variant>
struct result_multideduce1 {
- typedef typename Variant::types types;
+ typedef typename remove_reference<Variant>::type::types types;
typedef typename boost::mpl::begin<types>::type begin_it;
typedef typename boost::mpl::advance<
begin_it, boost::mpl::int_<boost::mpl::size<types>::type::value - 1>
@@ -95,14 +96,14 @@ struct result_multideduce1 {
struct deduce_impl {
typedef typename boost::mpl::next<It>::type next_t;
typedef typename boost::mpl::deref<It>::type value_t;
- typedef decltype(true ? boost::declval< Visitor& >()( boost::declval< value_t >() )
+ typedef decltype(true ? boost::declval< Visitor& >()( boost::declval< copy_cv_ref_t< value_t, Variant > >() )
: boost::declval< typename deduce_impl<next_t>::type >()) type;
};
template <class Dummy>
struct deduce_impl<last_it, Dummy> {
typedef typename boost::mpl::deref<last_it>::type value_t;
- typedef decltype(boost::declval< Visitor& >()( boost::declval< value_t >() )) type;
+ typedef decltype(boost::declval< Visitor& >()( boost::declval< copy_cv_ref_t< value_t, Variant > >() )) type;
};
typedef typename deduce_impl<begin_it>::type type;
@@ -132,7 +133,7 @@ inline decltype(auto) apply_visitor(Visitor&& visitor, Visitable&& visitable,
boost::detail::variant::has_result_type<Visitor>
>::type* = 0)
{
- boost::detail::variant::result_wrapper1<Visitor, typename remove_reference<Visitable>::type> cpp14_vis(::boost::forward<Visitor>(visitor));
+ boost::detail::variant::result_wrapper1<Visitor, Visitable> cpp14_vis(::boost::forward<Visitor>(visitor));
return ::boost::forward<Visitable>(visitable).apply_visitor(cpp14_vis);
}
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