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[identity_view] Fix for spoiled prvalue

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denzor200
2022-01-15 22:22:46 +04:00
parent d26c2e4212
commit 21a449ae46
2 changed files with 24 additions and 9 deletions
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24
include/boost/fusion/view/identity_view/identity_view.hpp
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@ -10,18 +10,34 @@
#include <boost/fusion/support/config.hpp> #include <boost/fusion/support/config.hpp>
#include <boost/fusion/view/transform_view.hpp> #include <boost/fusion/view/transform_view.hpp>
#include <boost/functional/identity.hpp> #include <boost/functional/identity.hpp>
#include <boost/utility/result_of.hpp>
namespace boost { namespace fusion {
namespace detail {
struct identity : boost::identity
{
};
}
}}
namespace boost {
template<typename T>
struct result_of<fusion::detail::identity(T)>
{
typedef T type;
};
}
namespace boost { namespace fusion { namespace boost { namespace fusion {
template<typename Sequence> struct identity_view template<typename Sequence> struct identity_view
: transform_view<Sequence, boost::identity> : transform_view<Sequence, detail::identity>
{ {
typedef transform_view<Sequence, boost::identity> base_type; typedef transform_view<Sequence, detail::identity> base_type;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
identity_view(Sequence& in_seq) identity_view(Sequence& in_seq)
: base_type(in_seq, boost::identity()) {} : base_type(in_seq, detail::identity()) {}
}; };
}} }}
#endif #endif

9
test/sequence/identity_view.cpp
View File

@ -77,7 +77,7 @@ main()
BOOST_TEST((*boost::fusion::advance_c<3>(boost::fusion::begin(xform)) == 8)); BOOST_TEST((*boost::fusion::advance_c<3>(boost::fusion::begin(xform)) == 8));
BOOST_TEST((boost::fusion::at_c<2>(xform) == 7)); BOOST_TEST((boost::fusion::at_c<2>(xform) == 7));
BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_at_c<xform_type, 0>::type, boost::mpl::integral_c<int, 5>&& >)); BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_at_c<xform_type, 0>::type, boost::mpl::integral_c<int, 5> >));
} }
{ {
@ -153,10 +153,9 @@ main()
typedef boost::fusion::result_of::next<first>::type second; typedef boost::fusion::result_of::next<first>::type second;
typedef boost::fusion::result_of::next<second>::type third; typedef boost::fusion::result_of::next<second>::type third;
// TODO: why is a boost::fusion::pair<int, char>&& ?? BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<first>::type, boost::fusion::pair<int, char> >));
BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<first>::type, boost::fusion::pair<int, char>&& >)); BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<second>::type, boost::fusion::pair<double, std::string> >));
BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<second>::type, boost::fusion::pair<double, std::string>&& >)); BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<third>::type, boost::fusion::pair<abstract, int> >));
BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<third>::type, boost::fusion::pair<abstract, int>&& >));
} }
{ {