/* Copyright 2015-2023 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ struct A { virtual int doit () { return 1; } virtual int doit3 () { return -3; } virtual int doit2 () = 0; }; struct B : virtual A { int doit () { return 2; } int doit2 () { return 22; } }; struct C : virtual A { int doit () { return 3; } int doit2 () { return 33; } }; struct D : B, C { int doit () { return 4; } int doit2 () { return 44; } }; int main () { int var = 1234; B b; C c; D d; A *ap = &d; var = (b.doit () + c.doit () + d.doit () + d.doit3 () + ap->doit () + ap->doit2 ()); // break here return 0; }