Type Alias R_altrep_DuplicateEX_method_t 

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

Like the Duplicate method above, but must duplicate the attributes in the same manner. May return a null pointer, in which case R will produce a materialised copy of the object by itself. The default method calls the Duplicate method, duplicates the attributes of x and installs them onto the return value.

Aliased Type

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

Variants

None

No value.

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

Some value of type T.