Struct RSidecar 

pub struct RSidecar;

Marker type for enabling R sidecar accessors in an ExternalPtr struct.

When used with #[derive(ExternalPtr)] and #[r_data], this field acts as a selector that enables R-facing accessors for sibling #[r_data] fields.

Supported Field Types

• SEXP - Raw SEXP access, no conversion
• i32, f64, bool, u8 - Zero-overhead scalars (stored directly in R)
• Any IntoR type - Automatic conversion (e.g., String, Vec<T>)

Example

use miniextendr_api::ffi::SEXP;

#[derive(ExternalPtr)]
pub struct MyType {
    pub x: i32,

    /// Selector field - enables R wrapper generation
    #[r_data]
    r: RSidecar,

    /// Raw SEXP slot - MyType_get_raw() / MyType_set_raw()
    #[r_data]
    pub raw: SEXP,

    /// Zero-overhead scalar - MyType_get_count() / MyType_set_count()
    #[r_data]
    pub count: i32,

    /// Conversion type - MyType_get_name() / MyType_set_name()
    #[r_data]
    pub name: String,
}

Design Notes

• RSidecar is a ZST (zero-sized type) - no runtime cost
• Only pub #[r_data] fields get R wrapper functions generated
• Multiple RSidecar fields in one struct is a compile error

Trait Implementations

impl Clone for RSidecar

fn clone(&self) -> RSidecar

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RSidecar

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

Formats the value using the given formatter.

impl Default for RSidecar

fn default() -> RSidecar

Returns the “default value” for a type.

impl Hash for RSidecar

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for RSidecar

fn eq(&self, other: &RSidecar) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for RSidecar

impl Eq for RSidecar

impl StructuralPartialEq for RSidecar