35 lines
758 B
Rust
35 lines
758 B
Rust
use super::*;
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#[derive(Clone, Copy)]
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pub struct SomeInner;
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#[allow(non_upper_case_globals)]
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pub const _Some: Prism<SomeInner> = Prism(SomeInner);
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impl<T> PrismPreview<Option<T>> for SomeInner {
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type Field = T;
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fn preview(&self, thing: Option<T>) -> Option<Self::Field> {
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thing
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}
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fn review(&self, thing: Self::Field) -> Option<T> {
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Some(thing)
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}
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}
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#[derive(Clone, Copy)]
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pub struct NoneInner;
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#[allow(non_upper_case_globals)]
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pub const _None: Prism<NoneInner> = Prism(NoneInner);
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impl<T> PrismPreview<Option<T>> for NoneInner {
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type Field = ();
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fn preview(&self, _thing: Option<T>) -> Option<Self::Field> {
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Some(())
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}
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fn review(&self, _thing: Self::Field) -> Option<T> {
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None
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}
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}
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