R_altstring_Elt_method_t

Type Alias R_altstring_Elt_method_t 

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

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§

§1.0.0

None

No value.

§1.0.0

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

Some value of type T.