void dummy () { Composite* aComposite = new Composite; Leaf* aLeaf = new Leaf; Component* aComponent; Composite* test; aComponent = aComposite; if (test = aComponent->GetComposite()) { test->Add(new Leaf); } aComponent = aLeaf; if (test = aComponent->GetComposite()) { test->Add(new Leaf); // will not add leaf } }