Velcro

A set of macros for conveniently initializing collections from Rust's std and iterators. All of the macros support the unary .. operator which "spreads" the values of another collection or iterator.

velcro::vec! is a drop-in replacement for std::vec!. All functionality of the std macro is supported without overhead, but it also supports spreading values with the .. operator.

Examples

use velcro::{hash_map, iter, vec};

assert_eq!(vec![0, 1, ..(2..7)], vec![0, 1, 2, 3, 4, 5, 6]);

let other = vec![3, 4, 5];
assert_eq!(vec![0, 1, 2, ..&other, 6], vec![0, 1, 2, 3, 4, 5, 6]);

let whitespace = iter![' ', '\t', '\r', '\n'];
let map = hash_map! {
    ..('0'..='9'): "digit",
    ..('a'..='z'): "lower",
    ..('A'..='Z'): "upper",
    ..whitespace: "whitespace",
    '.': "punctuation",
    ',': "punctuation",
};

assert_eq!(map[&'x'], "lower");
assert_eq!(map[&'\r'], "whitespace");
assert_eq!(map[&'.'], "punctuation");

Help

For help, questions or to report an issue, please use the Github issue tracker.