24 lines
566 B
Rust
24 lines
566 B
Rust
use crate::traversals::{Traversal, TraversalOver, TraversalTraverse};
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#[derive(Clone, Copy)]
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pub struct BothInner;
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#[allow(non_upper_case_globals)]
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pub const both: Traversal<BothInner> = Traversal(BothInner);
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impl<T> TraversalTraverse<(T, T)> for BothInner {
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type Field = T;
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fn traverse(&self, (a, b): (T, T)) -> Vec<Self::Field> {
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vec![a, b]
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}
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}
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impl<T> TraversalOver<(T, T)> for BothInner {
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fn over<F>(&self, (a, b): (T, T), mut f: F) -> (T, T)
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where
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F: FnMut(Self::Field) -> Self::Field,
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{
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(f(a), f(b))
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}
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}
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