34 releases
0.4.2 | Jun 17, 2023 |
---|---|
0.4.1 | Nov 3, 2022 |
0.4.0 | Jun 25, 2021 |
0.3.1 | Dec 21, 2019 |
0.0.11 | Mar 22, 2017 |
#2046 in Rust patterns
180,594 downloads per month
Used in 259 crates
(39 directly)
195KB
3K
SLoC
Frunk Core
This library forms the core of Frunk. It should ideally be minimalistic, containing only the fundamental building blocks of generic programming.
Examples
let h = hlist![1, false, 42f32];
let folded = h.foldr(hlist![|acc, i| i + acc,
|acc, _| if acc > 42f32 { 9000 } else { 0 },
|acc, f| f + acc],
1f32);
assert_eq!(folded, 9001);
// Reverse
let h1 = hlist![true, "hi"];
assert_eq!(h1.into_reverse(), hlist!["hi", true]);
// foldr (foldl also available)
let h2 = hlist![1, false, 42f32];
let folded = h2.foldr(
hlist![|acc, i| i + acc,
|acc, _| if acc > 42f32 { 9000 } else { 0 },
|acc, f| f + acc],
1f32
);
assert_eq!(folded, 9001);
// Mapping over an HList
let h3 = hlist![9000, "joe", 41f32];
let mapped = h3.to_ref().map(hlist![|&n| n + 1,
|&s| s,
|&f| f + 1f32]);
assert_eq!(mapped, hlist![9001, "joe", 42f32]);
// Plucking a value out by type
let h4 = hlist![1, "hello", true, 42f32];
let (t, remainder): (bool, _) = h4.pluck();
assert!(t);
assert_eq!(remainder, hlist![1, "hello", 42f32]);
// Resculpting an HList
let h5 = hlist![9000, "joe", 41f32, true];
let (reshaped, remainder2): (HList![f32, i32, &str], _) = h5.sculpt();
assert_eq!(reshaped, hlist![41f32, 9000, "joe"]);
assert_eq!(remainder2, hlist![true]);
Links:
Dependencies
~175KB