Type Alias R_altvec_Dataptr_or_null_method_t 

pub type R_altvec_Dataptr_or_null_method_t = Option<unsafe extern "C" fn(arg1: SEXP) -> *const c_void>;

Like the Dataptr method above, but the method may return a null pointer to indicate a preference for *_Elt (see REAL_ELT) and *_Get_region (see REAL_GET_REGION) methods instead of full buffer access. The return value will not be used to modify x. The default method always returns a null pointer.

Aliased Type

pub enum R_altvec_Dataptr_or_null_method_t {
    None,
    Some(unsafe extern "C" fn(*mut SEXPREC) -> *const c_void),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*mut SEXPREC) -> *const c_void)

Some value of type T.