base/shell/explorer-new/comcsup.h

   1 #ifndef __COMCSUP_H
   2 #define __COMCSUP_H
   3
   4 /*
   5  ******************************************************************************
   6  * This header is for easier generation of IUnknown interfaces for inherited  *
   7  * classes and for casts from the interface to the implementation and vice    *
   8  * versa.                                                                     *
   9  ******************************************************************************
  10  */
  11
  12 /* Generates a Iiface::AddRef() method that forwards to Iimpl::AddRef() */
  13 #define METHOD_IUNKNOWN_INHERITED_ADDREF_NAME(iface,impl) impl##Impl_##iface##_AddRef
  14 #define METHOD_IUNKNOWN_INHERITED_ADDREF(iface,impl) \
  15 static ULONG STDMETHODCALLTYPE \
  16 impl##Impl_##iface##_AddRef(IN OUT iface *ifc) { \
  17     impl##Impl *This = impl##Impl_from_##iface (ifc); \
  18     impl *baseiface = impl##_from_##impl##Impl(This); \
  19     return impl##Impl_AddRef(baseiface); \
  20 }
  21
  22 /* Generates a Iiface::Release() method that forwards to Iimpl::Release() */
  23 #define METHOD_IUNKNOWN_INHERITED_RELEASE_NAME(iface,impl) impl##Impl_##iface##_Release
  24 #define METHOD_IUNKNOWN_INHERITED_RELEASE(iface,impl) \
  25 static ULONG STDMETHODCALLTYPE \
  26 impl##Impl_##iface##_Release(IN OUT iface *ifc) { \
  27     impl##Impl *This = impl##Impl_from_##iface (ifc); \
  28     impl *baseiface = impl##_from_##impl##Impl(This); \
  29     return impl##Impl_AddRef(baseiface); \
  30 }
  31
  32 /* Generates a Iiface::QueryInterface() method that forwards to Iimpl::QueryInterface() */
  33 #define METHOD_IUNKNOWN_INHERITED_QUERYINTERFACE_NAME(iface,impl) impl##Impl_##iface##_QueryInterface
  34 #define METHOD_IUNKNOWN_INHERITED_QUERYINTERFACE(iface,impl) \
  35 static HRESULT STDMETHODCALLTYPE \
  36 impl##Impl_##iface##_QueryInterface(IN OUT iface *ifc, IN REFIID riid, OUT VOID **ppvObject) { \
  37     impl##Impl *This = impl##Impl_from_##iface (ifc); \
  38     impl *baseiface = impl##_from_##impl##Impl(This); \
  39     return impl##Impl_QueryInterface(baseiface, riid, ppvObject); \
  40 }
  41
  42 /* Generates a Ixxx_from_IxxxImpl() and a IxxxImpl_from_Ixxx() inline function */
  43 #define IMPL_CASTS(iface,impl,vtbl) \
  44 static __inline iface * \
  45 iface##_from_##impl##Impl (impl##Impl *This) { \
  46     return (iface *)&This->vtbl; \
  47 } \
  48 static __inline impl##Impl * \
  49 impl##Impl_from_##iface (iface *ifc) { \
  50     return (impl##Impl *)((ULONG_PTR)ifc - FIELD_OFFSET(impl##Impl, vtbl)); \
  51 }
  52
  53 #endif /* __COMCSUP_H */