Type Alias R_ToplevelCallback

pub type R_ToplevelCallback = Option<unsafe extern "C" fn(expr: SEXP, value: SEXP, succeeded: Rboolean, visible: Rboolean, arg1: *mut c_void) -> Rboolean>;

Aliased Type

enum R_ToplevelCallback {
    None,
    Some(unsafe extern "C" fn(*mut Struct_SEXPREC, *mut Struct_SEXPREC, Rboolean, Rboolean, *mut c_void) -> Rboolean),
}

Variants

None

No value.

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

Some value of type T.