tinyvec 0.4.0-alpha.4

Just, really the littlest Vec you could need. So smol.
Documentation 
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#![allow(bad_style)]

use std::iter::FromIterator;
use tinyvec::*;

#[test]
fn test_a_vec() {
  let mut expected: ArrayVec<[i32; 4]> = Default::default();
  expected.push(1);
  expected.push(2);
  expected.push(3);

  let actual = array_vec!(1, 2, 3);

  assert_eq!(expected, actual);
}

#[test]
fn ArrayVec_push_pop() {
  let mut av: ArrayVec<[i32; 4]> = Default::default();
  assert_eq!(av.len(), 0);
  assert_eq!(av.pop(), None);

  av.push(10_i32);
  assert_eq!(av.len(), 1);
  assert_eq!(av[0], 10);
  assert_eq!(av.pop(), Some(10));
  assert_eq!(av.len(), 0);
  assert_eq!(av.pop(), None);

  av.push(10);
  av.push(11);
  av.push(12);
  av.push(13);
  assert_eq!(av[0], 10);
  assert_eq!(av[1], 11);
  assert_eq!(av[2], 12);
  assert_eq!(av[3], 13);
  assert_eq!(av.len(), 4);
  assert_eq!(av.pop(), Some(13));
  assert_eq!(av.len(), 3);
  assert_eq!(av.pop(), Some(12));
  assert_eq!(av.len(), 2);
  assert_eq!(av.pop(), Some(11));
  assert_eq!(av.len(), 1);
  assert_eq!(av.pop(), Some(10));
  assert_eq!(av.len(), 0);
  assert_eq!(av.pop(), None);
}

#[test]
#[should_panic]
fn ArrayVec_push_overflow() {
  let mut av: ArrayVec<[i32; 0]> = Default::default();
  av.push(7);
}

#[test]
fn ArrayVec_formatting() {
  // check that we get the comma placement correct

  let mut av: ArrayVec<[i32; 4]> = Default::default();
  assert_eq!(format!("{:?}", av), "[]");
  av.push(10);
  assert_eq!(format!("{:?}", av), "[10]");
  av.push(11);
  assert_eq!(format!("{:?}", av), "[10, 11]");
  av.push(12);
  assert_eq!(format!("{:?}", av), "[10, 11, 12]");

  // below here just asserts that the impls exist.

  //
  let av: ArrayVec<[i32; 4]> = Default::default();
  assert_eq!(format!("{:b}", av), "[]");
  assert_eq!(format!("{:o}", av), "[]");
  assert_eq!(format!("{:x}", av), "[]");
  assert_eq!(format!("{:X}", av), "[]");
  assert_eq!(format!("{}", av), "[]");
  //
  let av: ArrayVec<[f32; 4]> = Default::default();
  assert_eq!(format!("{:e}", av), "[]");
  assert_eq!(format!("{:E}", av), "[]");
  //
  let av: ArrayVec<[&'static str; 4]> = Default::default();
  assert_eq!(format!("{:p}", av), "[]");
}

#[test]
fn ArrayVec_iteration() {
  let av = array_vec!([i32; 4] => 10, 11, 12, 13);

  let mut i = av.into_iter();
  assert_eq!(i.next(), Some(10));
  assert_eq!(i.next(), Some(11));
  assert_eq!(i.next(), Some(12));
  assert_eq!(i.next(), Some(13));
  assert_eq!(i.next(), None);

  let av = array_vec!([i32; 4] => 10, 11, 12, 13);

  let mut av2: ArrayVec<[i32; 4]> = av.clone().into_iter().collect();
  assert_eq!(av, av2);

  // IntoIterator for &mut ArrayVec
  for x in &mut av2 {
    *x = -*x;
  }

  // IntoIterator for &ArrayVec
  assert!(av.iter().zip(&av2).all(|(&a, &b)| a == -b));
}

#[test]
fn ArrayVec_append() {
  let mut av = array_vec!([i32; 8] => 1, 2, 3);
  let mut av2 = array_vec!([i32; 8] => 4, 5, 6);
  //
  av.append(&mut av2);
  assert_eq!(av.as_slice(), &[1_i32, 2, 3, 4, 5, 6]);
  assert_eq!(av2.as_slice(), &[]);
}

#[test]
fn ArrayVec_remove() {
  let mut av: ArrayVec<[i32; 10]> = Default::default();
  av.push(1);
  av.push(2);
  av.push(3);
  assert_eq!(av.remove(1), 2);
  assert_eq!(&av[..], &[1, 3][..]);
}

#[test]
#[should_panic]
fn ArrayVec_remove_invalid() {
  let mut av: ArrayVec<[i32; 1]> = Default::default();
  av.push(1);
  av.remove(1);
}

#[test]
fn ArrayVec_swap_remove() {
  let mut av: ArrayVec<[i32; 10]> = Default::default();
  av.push(1);
  av.push(2);
  av.push(3);
  av.push(4);
  assert_eq!(av.swap_remove(3), 4);
  assert_eq!(&av[..], &[1, 2, 3][..]);
  assert_eq!(av.swap_remove(0), 1);
  assert_eq!(&av[..], &[3, 2][..]);
  assert_eq!(av.swap_remove(0), 3);
  assert_eq!(&av[..], &[2][..]);
  assert_eq!(av.swap_remove(0), 2);
  assert_eq!(&av[..], &[][..]);
}

#[test]
fn ArrayVec_drain() {
  let mut av: ArrayVec<[i32; 10]> = Default::default();
  av.push(1);
  av.push(2);
  av.push(3);

  assert_eq!(Vec::from_iter(av.clone().drain(..)), vec![1, 2, 3]);

  assert_eq!(Vec::from_iter(av.clone().drain(..2)), vec![1, 2]);
  assert_eq!(Vec::from_iter(av.clone().drain(..3)), vec![1, 2, 3]);

  assert_eq!(Vec::from_iter(av.clone().drain(..=1)), vec![1, 2]);
  assert_eq!(Vec::from_iter(av.clone().drain(..=2)), vec![1, 2, 3]);

  assert_eq!(Vec::from_iter(av.clone().drain(0..)), vec![1, 2, 3]);
  assert_eq!(Vec::from_iter(av.clone().drain(1..)), vec![2, 3]);

  assert_eq!(Vec::from_iter(av.clone().drain(0..2)), vec![1, 2]);
  assert_eq!(Vec::from_iter(av.clone().drain(0..3)), vec![1, 2, 3]);
  assert_eq!(Vec::from_iter(av.clone().drain(1..2)), vec![2]);
  assert_eq!(Vec::from_iter(av.clone().drain(1..3)), vec![2, 3]);

  assert_eq!(Vec::from_iter(av.clone().drain(0..=1)), vec![1, 2]);
  assert_eq!(Vec::from_iter(av.clone().drain(0..=2)), vec![1, 2, 3]);
  assert_eq!(Vec::from_iter(av.clone().drain(1..=1)), vec![2]);
  assert_eq!(Vec::from_iter(av.clone().drain(1..=2)), vec![2, 3]);
}