[PATCH v2 2/3] include: Add IID_PPV_ARGS macro

[Alistair Leslie-Hughes]

From: Alistair Leslie-Hughes

---
 include/combaseapi.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/combaseapi.h b/include/combaseapi.h
index 41461f22e98..d3aa4a08bd9 100644
--- a/include/combaseapi.h
+++ b/include/combaseapi.h
@@ -57,4 +57,17 @@ HRESULT WINAPI RoGetAgileReference(enum AgileReferenceOptions options, REFIID ri
 }
 #endif

+#ifdef __cplusplus
+
+extern "C++" template<typename T> void **IID_PPV_ARGS_Helper(T **obj)
+{
+    (void)static_cast<IUnknown *>(*obj);
+    return reinterpret_cast<void **>(obj);
+}
+
+
+#define IID_PPV_ARGS(type) __uuidof(**(type)), IID_PPV_ARGS_Helper(type)
+
+#endif
+
 #endif /* _COMBASEAPI_H_ */