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 Eq for RSidecar

#[doc(hidden)]

fn assert_fields_are_eq(&self)

🔬This is a nightly-only experimental API. (derive_eq_internals)

#[doc(hidden)]

fn assert_receiver_is_total_eq(&self)

👎Deprecated since 1.95.0:

implementation detail of #[derive(Eq)]

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 StructuralPartialEq for RSidecar

impl TrivialClone for RSidecar

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: 0 bytes