Type Alias R_altstring_Elt_method_t 

pub type R_altstring_Elt_method_t = Option<unsafe extern "C" fn(arg1: SEXP, arg2: R_xlen_t) -> SEXP>;

Must return x[i] (for 0-based i) or signal an error. The default method always raises an error.

Aliased Type

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

Variants

None

No value.

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

Some value of type T.