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Add workaround for libstdc++ < 5

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This commit is contained in:
Peter Dimov
2017-06-09 03:22:31 +03:00
parent 613d411396
commit 893cd7c1e5
1 changed files with 16 additions and 0 deletions
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16
include/boost/variant2/variant.hpp
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@ -359,7 +359,15 @@ template<class T1, class... T> union variant_storage_impl<mp_true, T1, T...>
template<std::size_t I, class... A> constexpr void emplace( mp_size_t<I>, A&&... a )
{
#if defined( BOOST_LIBSTDCXX_VERSION ) && BOOST_LIBSTDCXX_VERSION < 50000
this->emplace_impl( mp_all<std::has_trivial_move_assign<T1>, std::has_trivial_move_assign<T>...>(), mp_size_t<I>(), std::forward<A>(a)... );
#else
this->emplace_impl( mp_all<std::is_trivially_move_assignable<T1>, std::is_trivially_move_assignable<T>...>(), mp_size_t<I>(), std::forward<A>(a)... );
#endif
}
constexpr T1& get( mp_size_t<0> ) noexcept { return first_; }
@ -495,7 +503,15 @@ template<class... T> struct variant_base_impl<true, true, T...>
std::size_t const J = I+1;
using U = mp_at_c<variant<T...>, I>;
#if defined( BOOST_LIBSTDCXX_VERSION ) && BOOST_LIBSTDCXX_VERSION < 50000
this->emplace_impl<J, U>( std::is_nothrow_constructible<U, A...>(), mp_all<std::has_trivial_move_constructor<U>, std::has_trivial_move_assign<T>...>(), std::forward<A>(a)... );
#else
this->emplace_impl<J, U>( std::is_nothrow_constructible<U, A...>(), mp_all<std::is_trivially_move_constructible<U>, std::is_trivially_move_assignable<T>...>(), std::forward<A>(a)... );
#endif
}
};