8 releases
0.5.4 | Jan 1, 2023 |
---|---|
0.5.2 | Jan 15, 2021 |
0.5.1 | Dec 20, 2020 |
0.4.2 | Dec 9, 2020 |
0.3.0 | Dec 2, 2020 |
#2485 in Rust patterns
5,193 downloads per month
Used in 35 crates
(via velcro_macros)
30KB
817 lines
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.
Dependencies
~1.5MB
~34K SLoC