Container initialization
This library provides a macro for initializing any container implementing
FromIterator.
#[macro_use] extern crate literator;
use std::collections::HashMap;
fn main() {
let v: Vec<_> = container![1, 2, 3];
assert_eq!(&v, &[1, 2, 3]);
let h: HashMap<_, _> = container! {
(1, 'x'),
(2, 'y'),
};
assert_eq!(h[1], 'x');
assert_eq!(h[2], 'y');
assert_eq!(h.len(), 2);
}A Perl-ish sugar for pairs is also available:
let h: HashMap<_, _> = container! {
1 => 'x',
2 => 'y',
};Iterator literals
container! is built on top of an "iterator literal" macro:
let mut it = literator!['x', 'y', 'z'];
assert_eq!(it.next(), Some('x'));
assert_eq!(it.next(), Some('y'));literator! works without heap allocation. The elements are moved into a
fixed-size array and then back out during iteration. Currently it supports up
to 32 entries. Once variadic
generics are available, there should be no limit.