extendr_api::wrapper::list

Struct FromList

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pub struct FromList<T>(pub T);
Expand description

You can use the FromList wrapper to coerce a Robj into a list.

use extendr_api::prelude::*;
test! {
    let list = Robj::from(list!(1, 2));
    let vec : FromList<Vec<i32>> = list.try_into()?;
    assert_eq!(vec.0, vec![1, 2]);
}

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§0: T

Trait Implementations§

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impl<T> TryFrom<&Robj> for FromList<Vec<T>>
where T: TryFrom<Robj>, <T as TryFrom<Robj>>::Error: Into<Error>,

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(robj: &Robj) -> Result<Self>

Performs the conversion.
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impl<T> TryFrom<Robj> for FromList<Vec<T>>
where T: TryFrom<Robj>, <T as TryFrom<Robj>>::Error: Into<Error>,

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(robj: Robj) -> Result<Self>

Performs the conversion.

Auto Trait Implementations§

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impl<T> Freeze for FromList<T>
where T: Freeze,

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impl<T> RefUnwindSafe for FromList<T>
where T: RefUnwindSafe,

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impl<T> Send for FromList<T>
where T: Send,

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impl<T> Sync for FromList<T>
where T: Sync,

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impl<T> Unpin for FromList<T>
where T: Unpin,

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impl<T> UnwindSafe for FromList<T>
where T: 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<U> 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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.