diff options
Diffstat (limited to 'src/corelib/global')
| -rw-r--r-- | src/corelib/global/qtypeinfo.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/corelib/global/qtypeinfo.h b/src/corelib/global/qtypeinfo.h index be21526339..2f7bb414b5 100644 --- a/src/corelib/global/qtypeinfo.h +++ b/src/corelib/global/qtypeinfo.h @@ -48,6 +48,8 @@ QT_BEGIN_NAMESPACE +class QDebug; + /* QTypeInfo - type trait functionality */ @@ -445,6 +447,23 @@ using compare_eq_result = std::enable_if_t<std::conjunction_v<QTypeTraits::has_o template <typename ...T> using compare_lt_result = std::enable_if_t<std::conjunction_v<QTypeTraits::has_operator_less_than<T>...>, bool>; +namespace detail { + +template<typename T> +const T const_value(); +template<typename T> +T &reference(); + +} + +template <typename Stream, typename, typename = void> +struct has_ostream_operator : std::false_type {}; +template <typename Stream, typename T> +struct has_ostream_operator<Stream, T, std::void_t<decltype(detail::reference<Stream>() << detail::const_value<T>())>> + : std::true_type {}; +template <typename Stream, typename T> +constexpr bool has_ostream_operator_v = has_ostream_operator<Stream, T>::value; + } |