| Alexandre Julliard | d6c0f9f | 2001-01-04 22:44:55 +0000 | [diff] [blame] | 1 | /* A few helpful macros for implementing COM objects. |
| 2 | * |
| 3 | * Copyright 2000 TransGaming Technologies Inc. |
| Alexandre Julliard | 0799c1a | 2002-03-09 23:29:33 +0000 | [diff] [blame] | 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2.1 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| Alexandre Julliard | d6c0f9f | 2001-01-04 22:44:55 +0000 | [diff] [blame] | 18 | */ |
| 19 | |
| Lionel Ulmer | 43c3dc4 | 2002-11-21 21:04:16 +0000 | [diff] [blame] | 20 | #ifndef _DDCOMIMPL_H_ |
| 21 | #define _DDCOMIMPL_H_ |
| 22 | |
| Alexandre Julliard | d6c0f9f | 2001-01-04 22:44:55 +0000 | [diff] [blame] | 23 | #include <stddef.h> |
| 24 | |
| 25 | /* Generates the name for a vtable pointer for a given interface. */ |
| 26 | /* The canonical name for a single interface is "lpVtbl". */ |
| 27 | #define ICOM_VFIELD_MULTI_NAME2(iface) ITF_##iface |
| 28 | #define ICOM_VFIELD_MULTI_NAME(iface) ICOM_VFIELD_MULTI_NAME2(iface) |
| 29 | |
| 30 | /* Declares a vtable pointer field in an implementation. */ |
| 31 | #define ICOM_VFIELD_MULTI(iface) \ |
| 32 | iface ICOM_VFIELD_MULTI_NAME(iface) |
| 33 | |
| 34 | /* Returns the offset of a vtable pointer within an implementation object. */ |
| 35 | #define ICOM_VFIELD_OFFSET(impltype, iface) \ |
| 36 | offsetof(impltype, ICOM_VFIELD_MULTI_NAME(iface)) |
| 37 | |
| 38 | /* Given an interface pointer, returns the implementation pointer. */ |
| 39 | #define ICOM_OBJECT(impltype, ifacename, ifaceptr) \ |
| 40 | (impltype*)((ifaceptr) == NULL ? NULL \ |
| 41 | : (char*)(ifaceptr) - ICOM_VFIELD_OFFSET(impltype,ifacename)) |
| 42 | |
| 43 | #define ICOM_THIS_FROM(impltype, ifacename, ifaceptr) \ |
| 44 | impltype* This = ICOM_OBJECT(impltype, ifacename, ifaceptr) |
| 45 | |
| 46 | /* Given an object and interface name, returns a pointer to that interface. */ |
| 47 | #define ICOM_INTERFACE(implobj, iface) \ |
| 48 | (&((implobj)->ICOM_VFIELD_MULTI_NAME(iface))) |
| 49 | |
| 50 | #define ICOM_INIT_INTERFACE(implobj, ifacename, vtblname) \ |
| 51 | do { \ |
| 52 | (implobj)->ICOM_VFIELD_MULTI_NAME(ifacename).lpVtbl = &(vtblname); \ |
| 53 | } while (0) |
| 54 | |
| 55 | #define COM_INTERFACE_CAST(impltype, ifnamefrom, ifnameto, ifaceptr) \ |
| 56 | ICOM_INTERFACE(ICOM_OBJECT(impltype, ifnamefrom, ifaceptr), ifnameto) |
| Lionel Ulmer | 43c3dc4 | 2002-11-21 21:04:16 +0000 | [diff] [blame] | 57 | |
| 58 | #endif /* _DDCOMIMPL_H_ */ |
