Method try_from

src/arrayvec.rs:1466–1482

The output has a length equal to that of the slice, with the same capacity as `A`.

(slice: &[T])

  /// The output has a length equal to that of the slice, with the same capacity
  /// as `A`.
  fn try_from(slice: &[T]) -> Result<Self, Self::Error> {
    if slice.len() > A::CAPACITY {
      Err(TryFromSliceError(()))
    } else {
      let mut arr = ArrayVec::new();
      // We do not use ArrayVec::extend_from_slice, because it looks like LLVM
      // fails to deduplicate all the length-checking logic between the
      // above if and the contents of that method, thus producing much
      // slower code. Unlike many of the other optimizations in this
      // crate, this one is worth keeping an eye on. I see no reason, for
      // any element type, that these should produce different code. But
      // they do. (rustc 1.51.0)
      arr.set_len(slice.len());
      arr.as_mut_slice().clone_from_slice(slice);
      Ok(arr)
    }
  }
}

impl<A: Array> FromIterator<A::Item> for ArrayVec<A> {