pub type PFNGLGETNEXTPERFQUERYIDINTELPROC = Option<unsafe extern "C" fn(queryId: GLuint, nextQueryId: *mut GLuint)>;
enum PFNGLGETNEXTPERFQUERYIDINTELPROC { None, Some(unsafe extern "C" fn(_: u32, _: *mut u32)), }
No value.
Some value of type T.
T