pub type VerifyCallback = Option<unsafe extern "C" fn(arg1: c_int, arg2: *mut WOLFSSL_X509_STORE_CTX) -> c_int>;
pub enum VerifyCallback { None, Some(unsafe extern "C" fn(i32, *mut WOLFSSL_X509_STORE_CTX) -> i32), }
No value.
Some value of type T.
T