Struct CollectStrings

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pub struct CollectStrings<I>(pub I);

Expand description

Write an ExactSizeIterator of String directly into an R character vector.

Strings require per-element CHARSXP allocation (no bulk copy_from_slice), so this is a separate type from Collect. Like Collect, it is an iterator adapter and is exempt from the As* naming convention (see #871).

§Example

#[miniextendr]
fn upper(words: Vec<String>) -> CollectStrings<impl ExactSizeIterator<Item = String>> {
    CollectStrings(words.into_iter().map(|w| w.to_uppercase()))
}

Tuple Fields§

§0: I

Trait Implementations§

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impl IntoR for CollectStrings
where I: ExactSizeIterator<Item = String>,

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type Error = Infallible

The error type for fallible conversions. Read more

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

Try to convert this value to an R SEXP. Read more

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

Try to convert to SEXP without thread safety checks. Read more

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fn into_sexp(self) -> SEXP
where Self: Sized,

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

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unsafe fn into_sexp_unchecked(self) -> SEXP
where Self: Sized,

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

Auto Trait Implementations§

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impl UnwindSafe for CollectStrings
where I: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> SizeHint for T
where T: ?Sized,

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default fn lower_bound(&self) -> usize

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

Returns a lower bound on the number of elements this container-like item contains. For example, an array [u8; 12] could return any value between 0 and 12 inclusively as a correct implementation. Read more

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default fn upper_bound(&self) -> Option<usize>

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

Returns an upper bound on the number of elements this container-like item contains if it can be determined, otherwise None. Read more

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final fn size_hint(&self) -> (usize, Option<usize>)

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

Returns an estimate for the number of elements this container like type contains. Read more

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