C++: template base class and default argument for template class

Fix code completion for case:
struct Foo
{
    int bar;
};

template <typename T>
struct Base
{
    T t;
};

template <typename T1 = Foo>
struct Derived : Base<T1>
{};

int main()
{
    Derived<> foo;
    foo.t.// no code completion
    return 0;
}

Task-number: QTCREATORBUG-12606
Change-Id: Iadf2fae172739d0a5844c6b437fd2686616e64e7
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/plugins/cpptools/cppcompletion_test.cpp b/src/plugins/cpptools/cppcompletion_test.cpp
index a55968da4a..e50a2a01b2 100644
--- a/src/plugins/cpptools/cppcompletion_test.cpp
+++ b/src/plugins/cpptools/cppcompletion_test.cpp
@@ -2281,6 +2281,20 @@ void CppToolsPlugin::test_completion_data()
             << QLatin1String("Derived")
             << QLatin1String("foo")
             << QLatin1String("Foo"));
+
+    QTest::newRow("default_arguments_for_class_templates_and_template_base_class_QTCREATORBUG-12606") << _(
+            "struct Foo { int foo; };\n"
+            "template <typename T>\n"
+            "struct Base { T t; };\n"
+            "template <typename T = Foo>\n"
+            "struct Derived : Base<T> {};\n"
+            "void fun() {\n"
+            "   Derived<> derived;\n"
+            "   @\n"
+            "}\n"
+        ) << _("derived.t.") << (QStringList()
+            << QLatin1String("foo")
+            << QLatin1String("Foo"));
 }
 
 void CppToolsPlugin::test_completion_member_access_operator()