Struct AsExternalPtr 

pub struct AsExternalPtr<T: IntoExternalPtr>(pub T);

Wrap a value and convert it to an R external pointer when returned from Rust.

Use this wrapper when you want to return a Rust value as an opaque pointer that R code can pass back to Rust functions later.

Example

struct Connection { handle: u64 }

impl IntoExternalPtr for Connection { /* ... */ }

#[miniextendr]
fn open_connection(path: &str) -> AsExternalPtr<Connection> {
    AsExternalPtr(Connection { handle: 42 })
}
// In R: open_connection("foo") returns an external pointer

Tuple Fields

0: T

Trait Implementations

impl<T: Clone + IntoExternalPtr> Clone for AsExternalPtr<T>

fn clone(&self) -> AsExternalPtr<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug + IntoExternalPtr> Debug for AsExternalPtr<T>

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

Formats the value using the given formatter.

impl<T: IntoExternalPtr> From<T> for AsExternalPtr<T>

fn from(value: T) -> Self

Converts to this type from the input type.

impl<T: IntoExternalPtr> IntoR for AsExternalPtr<T>

type Error = Infallible

The error type for fallible conversions.

fn try_into_sexp(self) -> Result<SEXP, Self::Error>

Try to convert this value to an R SEXP.

unsafe fn try_into_sexp_unchecked(self) -> Result<SEXP, Self::Error>

Try to convert to SEXP without thread safety checks.

fn into_sexp(self) -> SEXP

Convert this value to an R SEXP, panicking on error.

unsafe fn into_sexp_unchecked(self) -> SEXP

where Self: Sized,

Convert to SEXP without thread safety checks, panicking on error.

impl<T: Copy + IntoExternalPtr> Copy for AsExternalPtr<T>

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.