server: use void* instead of function pointer for wl_object.implementation

This is needed to make C++ programs that include wayland-server.h build:
C++ does not allow conversions from data pointers to function pointers.

diff --git a/src/wayland-util.h b/src/wayland-util.h
index 257a5d1..4728aaa 100644 (file)
--- a/src/wayland-util.h
+++ b/src/wayland-util.h
@@ -56,7 +56,7 @@ struct wl_interface {
 
 struct wl_object {
        const struct wl_interface *interface;
-       void (* const * implementation)(void);
+       const void *implementation;
        uint32_t id;
 };