pub type CK_C_DestroyObject = Option<unsafe extern "C" fn(arg1: CK_SESSION_HANDLE, arg2: CK_OBJECT_HANDLE) -> CK_RV>;
enum CK_C_DestroyObject { None, Some(unsafe extern "C" fn(_: u32, _: u32) -> u32), }
No value.
Some value of type T.
T