Module bumpalo::collections::vec

A contiguous growable array type with heap-allocated contents, written Vec<'bump, T>.

Vectors have O(1) indexing, amortized O(1) push (to the end) and O(1) pop (from the end).

This module is a fork of the std::vec module, that uses a bump allocator.

Examples

You can explicitly create a Vec<'bump, T> with new_in:

use bumpalo::{Bump, collections::Vec};

let b = Bump::new();
let v: Vec<i32> = Vec::new_in(&b);

… or by using the vec! macro:

use bumpalo::{Bump, collections::Vec};

let b = Bump::new();

let v: Vec<i32> = bumpalo::vec![in &b];

let v = bumpalo::vec![in &b; 1, 2, 3, 4, 5];

let v = bumpalo::vec![in &b; 0; 10]; // ten zeroes

You can push values onto the end of a vector (which will grow the vector as needed):

use bumpalo::{Bump, collections::Vec};

let b = Bump::new();

let mut v = bumpalo::vec![in &b; 1, 2];

v.push(3);

Popping values works in much the same way:

use bumpalo::{Bump, collections::Vec};

let b = Bump::new();

let mut v = bumpalo::vec![in &b; 1, 2];

assert_eq!(v.pop(), Some(2));

Vectors also support indexing (through the Index and IndexMut traits):

use bumpalo::{Bump, collections::Vec};

let b = Bump::new();

let mut v = bumpalo::vec![in &b; 1, 2, 3];
assert_eq!(v[2], 3);
v[1] += 5;
assert_eq!(v, [1, 7, 3]);

Structs

• Drain
  A draining iterator for Vec<'bump, T>.
• DrainFilter
  An iterator produced by calling Vec::drain_filter.
• IntoIter
  An iterator that moves out of a vector.
• Splice
  A splicing iterator for Vec.
• Vec
  A contiguous growable array type, written Vec<'bump, T> but pronounced ‘vector’.