vector – Make Me Engineer

What is the best way to concatenate vectors in Rust?

June 6, 2023 by Tarik

The structure std::vec::Vec has method append(): fn append(&mut self, other: &mut Vec<T>) Moves all the elements of other into Self, leaving other empty. From your example, the following code will concatenate two vectors by mutating a and b: fn main() { let mut a = vec![1, 2, 3]; let mut b = vec![4, 5, 6]; … Read more

Simultaneous mutable access to arbitrary indices of a large vector that are guaranteed to be disjoint

May 15, 2023 by Tarik

When the compiler can’t enforce that mutable references to a slice elements aren’t exclusive, Cell is pretty nice. You can transform a &mut [T] into a &Cell<[T]> using Cell::from_mut, and then a &Cell<[T]> into a &[Cell<T>] using Cell::as_slice_of_cells. All of this is zero-cost: It’s just there to guide the type-system. A &[Cell<T>] is like a … Read more