CPlusPlus: Support completion of list iterators

Fixes: QTCREATORBUG-30608
Change-Id: I169efe675e13540ecc5fbbd6b15dd13d8522db7d
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

2 files changed, 18 insertions, 0 deletions

diff --git a/src/libs/cplusplus/ResolveExpression.cpp b/src/libs/cplusplus/ResolveExpression.cpp
index 4fc1cd2d56..e779c447bf 100644
--- a/src/libs/cplusplus/ResolveExpression.cpp
+++ b/src/libs/cplusplus/ResolveExpression.cpp
@@ -1062,6 +1062,8 @@ ClassOrNamespace *ResolveExpression::baseExpression(const QList<LookupItem> &bas
         }
 
         typedefsResolver.resolve(&ty, &scope, r.binding());
+        if (auto ref = ty->asReferenceType()) // deref if needed
+            ty = ref->elementType();
 
         if (Q_UNLIKELY(debug))
             qDebug() << "-  after typedef resolving:" << oo.prettyType(ty);
@@ -1082,6 +1084,9 @@ ClassOrNamespace *ResolveExpression::baseExpression(const QList<LookupItem> &bas
                 if (ClassOrNamespace *binding = findClass(type, scope))
                     return binding;
 
+                if (ClassOrNamespace *binding = findClass(type, r.scope())) // local classes and structs
+                    return binding;
+
             } else {
                 ClassOrNamespace *binding
                         = findClassForTemplateParameterInExpressionScope(r.binding(),
@@ -1176,6 +1181,9 @@ ClassOrNamespace *ResolveExpression::baseExpression(const QList<LookupItem> &bas
 
             if (ClassOrNamespace *binding = findClass(ty, scope, enclosingBinding))
                 return binding;
+
+            if (ClassOrNamespace *binding = findClass(ty, r.scope())) // local classes and structs
+                return binding;
         }
     }
 
diff --git a/src/plugins/cppeditor/cppcompletion_test.cpp b/src/plugins/cppeditor/cppcompletion_test.cpp
index fdc30e16be..6f152c65a6 100644
--- a/src/plugins/cppeditor/cppcompletion_test.cpp
+++ b/src/plugins/cppeditor/cppcompletion_test.cpp
@@ -2889,6 +2889,16 @@ void CompletionTest::testCompletionMemberAccessOperator_data()
         ) << _("p->") << QStringList({"S", "m"})
         << false
         << false;
+    QTest::newRow("dot to arrow: template + reference + double typedef")
+        << _("template <typename T> struct C {\n"
+             "    using ref = T &;\n"
+             "    ref operator[](int i);\n"
+             "};\n"
+             "struct S { int m; };\n"
+             "template<typename T> using CS = C<T>;\n"
+             "CS<S *> v;\n"
+             "@\n")
+        << _("v[0].") << QStringList({"S", "m"}) << false << true;
 }
 
 } // namespace CppEditor::Internal