Type Alias R_altrep_Length_method_t 

pub type R_altrep_Length_method_t = Option<unsafe extern "C" fn(arg1: SEXP) -> R_xlen_t>;

Must return the length of the compact-representation vector, or signal an error. The default method signals an error.

Aliased Type

pub enum R_altrep_Length_method_t {
    None,
    Some(unsafe extern "C" fn(*mut SEXPREC) -> isize),
}

Variants

None

No value.

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

Some value of type T.