Test2a Test2b Test2c Test2d Test2e Test2a definition doSomething(Test2b) declaration Test2b Test2c definition Test2d Test2e Test2e(const Test2a &) definition Test2a Test2b Test2c Test2d Test2e Test2a Test2b Test2c Test2d Test2e Test2a Test2e true false pass by reference Test2b true true has by reference pass by value Test2e true true inheritance Test2b Test2a true true has by reference pass by value Test2c Test2d true true has by value Test2d Test2c true true has by value Test2e Test2a true true inheritance Test2a true false pass by reference <file scope items>