33 lines
934 B
Rust
33 lines
934 B
Rust
use std::sync::Arc;
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use crate::lenses::{Lens, LensView};
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use super::lens::FuncLens;
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#[derive(Clone)]
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pub struct ToInner<T, U>(Arc<dyn Fn(T) -> U>);
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impl<T, U> LensView<T> for ToInner<T, U> {
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type Field = U;
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fn view(&self, thing: T) -> Self::Field {
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(self.0)(thing)
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}
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}
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/// Makes a lens that implements `LensView<T>` with the provided function
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pub fn to_from_boxed<T, U>(f: Arc<dyn Fn(T) -> U>) -> Lens<ToInner<T, U>> {
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Lens(ToInner(f))
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}
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/// Makes a lens that implements `LensView<T>` with the provided function
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pub fn to<T, U>(f: impl Fn(T) -> U + 'static) -> Lens<ToInner<T, U>> {
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Lens(ToInner(Arc::new(f)))
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}
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impl<T, U> Lens<ToInner<T, U>> {
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/// Makes a full lens that implements `LensView<T>` and `LensOver<T>` with the provided functions
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pub fn make_lens(self, setter: impl Fn(T, U) -> T + 'static) -> Lens<FuncLens<T, U>> {
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Lens(FuncLens((self.0).0, Arc::new(setter)))
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}
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}
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