23 lines
458 B
Rust
23 lines
458 B
Rust
use crate::lenses::{Lens, LensOver, LensView};
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#[derive(Clone, Copy)]
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pub struct IdInner;
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#[allow(non_upper_case_globals)]
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pub const id: Lens<IdInner> = Lens(IdInner);
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impl<T> LensView<T> for IdInner {
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type Field = T;
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fn view(&self, thing: T) -> Self::Field {
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thing
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}
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}
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impl<T> LensOver<T> for IdInner {
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fn over<F>(&self, thing: T, f: F) -> T
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where
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F: FnOnce(Self::Field) -> Self::Field,
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{
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f(thing)
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}
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}
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