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N3031 workaround for compilers without alias templates

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This commit is contained in:
Nikita Kniazev
2018-10-14 02:49:25 +03:00
parent 2160949150
commit b5ba6cbd2b
1 changed files with 6 additions and 0 deletions
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6
include/boost/fusion/support/config.hpp
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@ -101,6 +101,7 @@ namespace std
#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1913)) || \
BOOST_WORKAROUND(BOOST_GCC, < 40700) || \
defined(BOOST_CLANG) && (__clang_major__ == 3 && __clang_minor__ == 0)
# if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
namespace boost { namespace fusion { namespace detail
{
template <typename T>
@ -108,6 +109,11 @@ namespace boost { namespace fusion { namespace detail
}}}
# define BOOST_FUSION_DECLTYPE_N3031(parenthesized_expr) \
boost::fusion::detail::type_alias_t<decltype parenthesized_expr>
# else
# include <boost/mpl/identity.hpp>
# define BOOST_FUSION_DECLTYPE_N3031(parenthesized_expr) \
boost::mpl::identity<decltype parenthesized_expr>::type
# endif
#else
# define BOOST_FUSION_DECLTYPE_N3031(parenthesized_expr) \
decltype parenthesized_expr