diff options
| -rw-r--r-- | src/corelib/itemmodels/qrangemodel_impl.h | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/src/corelib/itemmodels/qrangemodel_impl.h b/src/corelib/itemmodels/qrangemodel_impl.h index f6b08099fe7..7eca3094a66 100644 --- a/src/corelib/itemmodels/qrangemodel_impl.h +++ b/src/corelib/itemmodels/qrangemodel_impl.h @@ -239,17 +239,15 @@ namespace QRangeModelDetails : std::true_type {}; - // we use std::rotate in moveRows/Columns, which requires std::swap and the - // iterators to be at least a forward iterator - template <typename It, typename = void> - struct test_rotate : std::false_type {}; - + // we use std::rotate in moveRows/Columns, which requires the values (which + // might be const if we only get a const iterator) to be swappable, and the + // iterator type to be at least a forward iterator template <typename It> - struct test_rotate<It, std::void_t<decltype(std::swap(*std::declval<It>(), - *std::declval<It>()))>> - : std::is_base_of<std::forward_iterator_tag, - typename std::iterator_traits<It>::iterator_category> - {}; + using test_rotate = std::conjunction< + std::is_swappable<decltype(*std::declval<It>())>, + std::is_base_of<std::forward_iterator_tag, + typename std::iterator_traits<It>::iterator_category> + >; template <typename C, typename = void> struct test_splice : std::false_type {}; |