Enum RDataHelper 

pub(crate) enum RDataHelper {
    Fields,
    Get,
    Set,
    NoField,
    ErrorClass,
    EveryRead,
    Live,
}

The R helpers #[derive(ExternalPtr)] emits for a type’s sidecar fields and the $ / [[ field methods of r_data_accessors call (#1848).

Variants

Fields

.rdata_fields_<Type>: the field names, a character vector.

Get

.rdata_get_<Type>(x, name): the field’s getter .Call().

Set

.rdata_set_<Type>(x, name, value): the field’s setter .Call().

NoField

.rdata_no_field_<Type>(name, env, cls): the miniextendr_no_field error, naming the R class cls the method serves.

ErrorClass

.rdata_error_class_<Type>: the classes the field methods put in front of their own errors, #[externalptr(field_error(class = ...))] (#1899); NULL without them.

EveryRead

.rdata_every_read_<Type>: TRUE for a type with restored(refuse = "every_read") (#1901), else FALSE; it gates the field methods’ calls of RDataHelper::Live.

Live

.rdata_live_<Type>(x, raise): the liveness check of a type with restored(refuse = "every_read") (#1901). Other types get a stub that is never called (gated by RDataHelper::EveryRead), so a binding the methods call is always a function, as R CMD check expects.

Trait Implementations

impl Clone for RDataHelper

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for RDataHelper

impl Debug for RDataHelper

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl TrivialClone for RDataHelper

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• Fields: 0 bytes
• Get: 0 bytes
• Set: 0 bytes
• NoField: 0 bytes
• ErrorClass: 0 bytes
• EveryRead: 0 bytes
• Live: 0 bytes