Crate frunk_core [−] [src]
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![|i, acc| i + acc, |_, acc| if acc > 42f32 { 9000 } else { 0 }, |f, acc| 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![|i, acc| i + acc, |_, acc| if acc > 42f32 { 9000 } else { 0 }, |f, acc| f + acc], 1f32 ); assert_eq!(folded, 9001); // Mapping over an HList let h3 = hlist![9000, "joe", 41f32]; let mapped = (&h3).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]);Run
Links:
Modules
generic |
This module holds the machinery behind Generic. |
hlist |
Module that holds HList data structures, implementations, and typeclasses. |
labelled |
This module holds the machinery behind LabelledGeneric. |
Macros
Hlist |
Returns a type signature for an HList of the provided types |
field |
Used for creating a Field |
hlist |
Returns an |
hlist_pat |
Macro for pattern-matching on HLists. |