[vlc-devel] [PATCH v4 3/5] display: add macro to set the callbacks and check type of the Open/Close

[Steve Lhomme]

---
 include/vlc_vout_display.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/vlc_vout_display.h b/include/vlc_vout_display.h
index fd4940cf6d..1cbd6b1891 100644
--- a/include/vlc_vout_display.h
+++ b/include/vlc_vout_display.h
@@ -215,6 +215,23 @@ typedef int (*vout_display_open_cb)(vout_display_t *vd,
  */
 typedef void (*vout_display_close_cb)(vout_display_t *vd);
 
+#ifndef __cplusplus
+#define set_callbacks_display(Activate, Deactivate) \
+    static_assert( _Generic( Activate, vout_display_open_cb: 1, default: 0 ) == 1, \
+                  "Not a display activate callback"); \
+    static_assert( _Generic( Deactivate, vout_display_close_cb: 1, void*: 1, default: 0 ) == 1, \
+                  "Not a display deactivate callback"); \
+    set_callbacks( Activate, Deactivate )
+#else /* __cplusplus */
+#define set_callbacks_display(Activate, Deactivate) \
+    static_assert( std::is_same<std::add_pointer<decltype(Activate)>::type, vout_display_open_cb>::value, \
+                  "Not a display activate callback"); \
+    static_assert( std::is_same<std::add_pointer<decltype(Deactivate)>::type, vout_display_close_cb>::value || \
+                   std::is_same<decltype(Deactivate),std::nullptr_t>::value, \
+                  "Not a display deactivate callback"); \
+    set_callbacks( Activate, Deactivate )
+#endif /* __cplusplus */
+
 struct vout_display_t {
     struct vlc_object_t obj;
 
-- 
2.17.1