Fix std::iterator deprecation warning with MSVC19

C++17 depreceates std::iterator class for inheriting (warning STL4015)

Task-number: QTBUG-89832
Change-Id: I27c0c4796239f409c02114b646c2c94151dafdea
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

1 files changed, 8 insertions, 2 deletions

diff --git a/src/scxml/qscxmlexecutablecontent_p.h b/src/scxml/qscxmlexecutablecontent_p.h
index 5980330..1477769 100644
--- a/src/scxml/qscxmlexecutablecontent_p.h
+++ b/src/scxml/qscxmlexecutablecontent_p.h
@@ -404,11 +404,17 @@ struct StateTable {
             return *(start + idx + 1);
         }
 
-        struct const_iterator: public std::iterator<std::forward_iterator_tag, int, ptrdiff_t,
-                                                    const int *, const int &>
+        struct const_iterator
         {
             const_iterator(const Array &a, int pos): a(a), pos(pos) {}
 
+            // std::iterator_traits
+            using value_type = int;
+            using pointer = const int*;
+            using reference = const int&;
+            using difference_type = std::ptrdiff_t;
+            using iterator_category =  std::forward_iterator_tag;
+
             const_iterator &operator++() {
                 if (pos < a.size()) ++pos;
                 return *this;