Struct Collect 

pub struct Collect<I>(pub I);

Write an ExactSizeIterator of native R types directly into an R vector.

Skips the intermediate Vec allocation — the R vector is allocated once and the iterator writes directly into it.

Requires ExactSizeIterator because R vectors must know their length at allocation time.

Naming

Collect is in the representation-forcing wrapper family but does not take the As* prefix used by AsList / AsExternalPtr / AsRNative: those wrap a finished value T, whereas Collect wraps an iterator and materializes it into an R vector. The divergence is intentional — see the module docs and #871.

Example

#[miniextendr]
fn sines(n: i32) -> Collect<impl ExactSizeIterator<Item = f64>> {
    Collect((0..n).map(|i| (i as f64).sin()))
}

Tuple Fields

0: I

Trait Implementations

impl<I, T> IntoR for Collect<I>

where I: ExactSizeIterator<Item = T>, T: RNativeType,

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

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

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.