1 files changed, 97 insertions, 0 deletions
diff --git a/tests/unneeded-cast/main.cpp b/tests/unneeded-cast/main.cpp
new file mode 100644
index 00000000..808e1a87
--- /dev/null
+++ b/tests/unneeded-cast/main.cpp
@@ -0,0 +1,97 @@
+#include <QtCore/QObject>
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+struct A
+{
+    virtual void foo() { }
+};
+
+struct B : public A
+{
+
+};
+
+void test()
+{
+    A *a = new A();
+    B *b = new B();
+
+    dynamic_cast<A*>(b); // warning: Casting to base
+    dynamic_cast<A*>(a); // warning: Casting to itself
+    dynamic_cast<B*>(a); // OK
+    dynamic_cast<B*>(b); // warning: Casting to itself
+    static_cast<A*>(b); // warning: Casting to base
+    static_cast<A*>(a); // warning: Casting to itself
+    static_cast<B*>(a); // OK
+    static_cast<B*>(b); // warning: Casting to itself
+}
+
+class MyObj : public QObject
+{
+    Q_OBJECT
+public:
+};
+
+void testQObjectCast(QObject *o)
+{
+    dynamic_cast<MyObj*>(o); // Warn
+    qobject_cast<QObject*>(o); // Warn
+    MyObj myobj;
+    qobject_cast<QObject*>(&myobj); // Warn
+    qobject_cast<MyObj*>(o); // OK
+}
+
+class FwdDeclared;
+
+class MyObj2 : public QObject
+{
+public:
+    Q_DECLARE_PUBLIC(QObject) // OK, in macro
+    MyObj2 *q_ptr;
+};
+
+struct Base2 {};
+class Base1 : public QObject {};
+
+class Derived : public Base1, public Base2
+{
+public:
+    void test()
+    {
+        static_cast<Base1*>(this); // OK
+        static_cast<Base2*>(this); // OK
+    }
+};
+
+void test2()
+{
+    static_cast<MyObj*>(nullptr); // OK
+    static_cast<MyObj*>(0); // OK
+
+    MyObj *o1;
+    MyObj2 *o2;
+    true ? static_cast<QObject*>(o1)  : static_cast<QObject*>(o2); // Ok
+}
+
+class MyObj4 : public QObject
+{
+    Q_OBJECT
+public:
+    void test()
+    {
+        qobject_cast<MyObj4*>(sender()); // OK
+    }
+};