40 lines
1.5 KiB
C
40 lines
1.5 KiB
C
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/* A few helpful macros for implementing COM objects.
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*
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* Copyright 2000 TransGaming Technologies Inc.
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*/
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#include <stddef.h>
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/* Generates the name for a vtable pointer for a given interface. */
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/* The canonical name for a single interface is "lpVtbl". */
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#define ICOM_VFIELD_MULTI_NAME2(iface) ITF_##iface
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#define ICOM_VFIELD_MULTI_NAME(iface) ICOM_VFIELD_MULTI_NAME2(iface)
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/* Declares a vtable pointer field in an implementation. */
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#define ICOM_VFIELD_MULTI(iface) \
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iface ICOM_VFIELD_MULTI_NAME(iface)
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/* Returns the offset of a vtable pointer within an implementation object. */
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#define ICOM_VFIELD_OFFSET(impltype, iface) \
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offsetof(impltype, ICOM_VFIELD_MULTI_NAME(iface))
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/* Given an interface pointer, returns the implementation pointer. */
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#define ICOM_OBJECT(impltype, ifacename, ifaceptr) \
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(impltype*)((ifaceptr) == NULL ? NULL \
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: (char*)(ifaceptr) - ICOM_VFIELD_OFFSET(impltype,ifacename))
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#define ICOM_THIS_FROM(impltype, ifacename, ifaceptr) \
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impltype* This = ICOM_OBJECT(impltype, ifacename, ifaceptr)
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/* Given an object and interface name, returns a pointer to that interface. */
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#define ICOM_INTERFACE(implobj, iface) \
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(&((implobj)->ICOM_VFIELD_MULTI_NAME(iface)))
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#define ICOM_INIT_INTERFACE(implobj, ifacename, vtblname) \
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do { \
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(implobj)->ICOM_VFIELD_MULTI_NAME(ifacename).lpVtbl = &(vtblname); \
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} while (0)
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#define COM_INTERFACE_CAST(impltype, ifnamefrom, ifnameto, ifaceptr) \
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ICOM_INTERFACE(ICOM_OBJECT(impltype, ifnamefrom, ifaceptr), ifnameto)
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