1 /* Copyright 2015-2020 Free Software Foundation, Inc. 2 3 This program is free software; you can redistribute it and/or modify 4 it under the terms of the GNU General Public License as published by 5 the Free Software Foundation; either version 3 of the License, or 6 (at your option) any later version. 7 8 This program is distributed in the hope that it will be useful, 9 but WITHOUT ANY WARRANTY; without even the implied warranty of 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License 14 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 15 16 struct A 17 { 18 virtual int doit () { return 1; } 19 virtual int doit3 () { return -3; } 20 virtual int doit2 () = 0; 21 }; 22 23 struct B : virtual A 24 { 25 int doit () { return 2; } 26 int doit2 () { return 22; } 27 }; 28 29 struct C : virtual A 30 { 31 int doit () { return 3; } 32 int doit2 () { return 33; } 33 }; 34 35 struct D : B, C 36 { 37 int doit () { return 4; } 38 int doit2 () { return 44; } 39 }; 40 41 int 42 main () 43 { 44 int var = 1234; 45 B b; 46 C c; 47 D d; 48 A *ap = &d; 49 50 var = (b.doit () + c.doit () + d.doit () + d.doit3 () 51 + ap->doit () + ap->doit2 ()); // break here 52 53 return 0; 54 } 55