pub type PFNVIDDECODECALLBACK = Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: *mut CUVIDPICPARAMS) -> c_int>;
pub enum PFNVIDDECODECALLBACK { None, Some(unsafe extern "C" fn(*mut c_void, *mut _CUVIDPICPARAMS) -> i32), }
No value.
Some value of type T.
T