C++: fix code completion for decltyped type

example:
struct Foo { int bar; };
Foo foo() { return Foo; }
typedef decltype(foo()) TypedefedFooWithDecltype;
void fun()
{
  decltype(foo()) decltypeFoo;
  decltypeFoo.;// code completion should work here

  TypedefedFooWithDecltype typedefedFooWithDecltype;
  typedefedFooWithDecltype.;// code completion should work here
}

Started-by: Przemyslaw Gorszkowski <pgorszkowski@gmail.com>
Task-number: QTCREATORBUG-14483
Change-Id: I296ceed9d896c68cf0651265afb08a1fc42f9a68
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/plugins/cpptools/cppcompletion_test.cpp b/src/plugins/cpptools/cppcompletion_test.cpp
index 8554ec391f..f8daef6d71 100644
--- a/src/plugins/cpptools/cppcompletion_test.cpp
+++ b/src/plugins/cpptools/cppcompletion_test.cpp
@@ -2940,6 +2940,29 @@ void CppToolsPlugin::test_completion_data()
     ) << _("p.") << (QStringList()
         << QLatin1String("Nested2")
         << QLatin1String("bar"));
+
+    QTest::newRow("simple_decltype_declaration") << _(
+            "struct Foo { int bar; };\n"
+            "Foo foo;\n"
+            "void fun() {\n"
+            "   decltype(foo) s;\n"
+            "   @\n"
+            "}\n"
+    ) << _("s.") << (QStringList()
+            << QLatin1String("Foo")
+            << QLatin1String("bar"));
+
+    QTest::newRow("typedefed_decltype_declaration") << _(
+            "struct Foo { int bar; };\n"
+            "Foo foo;\n"
+            "typedef decltype(foo) TypedefedFooWithDecltype;\n"
+            "void fun() {\n"
+            "   TypedefedFooWithDecltype s;\n"
+            "   @\n"
+            "}\n"
+    ) << _("s.") << (QStringList()
+            << QLatin1String("Foo")
+            << QLatin1String("bar"));
 }
 
 void CppToolsPlugin::test_completion_member_access_operator()