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Add operator<< for monostate

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This commit is contained in:
Peter Dimov
2022-01-31 17:55:26 +02:00
parent 573ef77382
commit 5e2bce1baa
3 changed files with 23 additions and 6 deletions
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7
include/boost/variant2/variant.hpp
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@ -2263,6 +2263,13 @@ template<class Os, class T> struct is_output_streamable<Os, T, decltype( std::de
} // namespace detail
template<class Ch, class Tr>
std::basic_ostream<Ch, Tr>& operator<<( std::basic_ostream<Ch, Tr>& os, monostate const& )
{
os << "monostate";
return os;
}
template<class Ch, class Tr, class T1, class... T,
class E = typename std::enable_if< mp11::mp_all< detail::is_output_streamable<std::basic_ostream<Ch, Tr>, T>... >::value >::type >
std::basic_ostream<Ch, Tr>& operator<<( std::basic_ostream<Ch, Tr>& os, variant<T1, T...> const& v )