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Fix variant_alternative for g++ 4.8

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Peter Dimov
2019-02-21 23:06:24 +02:00
parent 34933c35bd
commit c1287f9e95
1 changed files with 48 additions and 0 deletions
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48
include/boost/variant2/variant.hpp
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@@ -137,10 +137,34 @@ template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T
{ {
}; };
template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T...> const&, true>: std::add_lvalue_reference< mp11::mp_at_c<variant<T...>, I> const >
{
};
template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T...> volatile&, true>: std::add_lvalue_reference< mp11::mp_at_c<variant<T...>, I> volatile >
{
};
template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T...> const volatile&, true>: std::add_lvalue_reference< mp11::mp_at_c<variant<T...>, I> const volatile >
{
};
template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T...>&&, true>: std::add_rvalue_reference< mp11::mp_at_c<variant<T...>, I> > template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T...>&&, true>: std::add_rvalue_reference< mp11::mp_at_c<variant<T...>, I> >
{ {
}; };
template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T...> const&&, true>: std::add_rvalue_reference< mp11::mp_at_c<variant<T...>, I> const >
{
};
template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T...> volatile&&, true>: std::add_rvalue_reference< mp11::mp_at_c<variant<T...>, I> volatile >
{
};
template<std::size_t I, class... T> struct variant_alternative_impl<I, variant<T...> const volatile&&, true>: std::add_rvalue_reference< mp11::mp_at_c<variant<T...>, I> const volatile >
{
};
} // namespace detail } // namespace detail
template<std::size_t I, class T> struct variant_alternative template<std::size_t I, class T> struct variant_alternative
@@ -167,10 +191,34 @@ template<std::size_t I, class... T> struct variant_alternative<I, variant<T...>&
{ {
}; };
template<std::size_t I, class... T> struct variant_alternative<I, variant<T...> const&>: public detail::variant_alternative_impl<I, variant<T...> const&, (I < sizeof...(T))>
{
};
template<std::size_t I, class... T> struct variant_alternative<I, variant<T...> volatile&>: public detail::variant_alternative_impl<I, variant<T...> volatile&, (I < sizeof...(T))>
{
};
template<std::size_t I, class... T> struct variant_alternative<I, variant<T...> const volatile&>: public detail::variant_alternative_impl<I, variant<T...> const volatile&, (I < sizeof...(T))>
{
};
template<std::size_t I, class... T> struct variant_alternative<I, variant<T...>&&>: public detail::variant_alternative_impl<I, variant<T...>&&, (I < sizeof...(T))> template<std::size_t I, class... T> struct variant_alternative<I, variant<T...>&&>: public detail::variant_alternative_impl<I, variant<T...>&&, (I < sizeof...(T))>
{ {
}; };
template<std::size_t I, class... T> struct variant_alternative<I, variant<T...> const&&>: public detail::variant_alternative_impl<I, variant<T...> const&&, (I < sizeof...(T))>
{
};
template<std::size_t I, class... T> struct variant_alternative<I, variant<T...> volatile&&>: public detail::variant_alternative_impl<I, variant<T...> volatile&&, (I < sizeof...(T))>
{
};
template<std::size_t I, class... T> struct variant_alternative<I, variant<T...> const volatile&&>: public detail::variant_alternative_impl<I, variant<T...> const volatile&&, (I < sizeof...(T))>
{
};
#else #else
namespace detail namespace detail