42 lines
1.1 KiB
Rust
42 lines
1.1 KiB
Rust
use crate::{How, IntoContext, IntoResultHow};
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crate::seal!(pub(crate) private::Sealed);
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pub trait Explain: Sealed {
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type Output;
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#[must_use]
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fn context(self, context: impl IntoContext) -> Self::Output;
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}
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impl<T, E> Sealed for Result<T, E> where Result<T, E>: IntoResultHow {}
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impl<T> Sealed for Option<T> where Option<T>: IntoResultHow {}
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impl<T, E> Explain for Result<T, E>
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where
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Result<T, E>: IntoResultHow,
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{
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type Output = Result<<Self as IntoResultHow>::T, How>;
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#[inline(always)]
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#[track_caller]
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fn context(self, context: impl IntoContext) -> Self::Output {
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self.into_result_how().map_err(#[inline(never)] move |e| e.context(context))
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}
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}
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impl<T> Explain for Option<T> {
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type Output = Result<T, How>;
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#[inline(always)]
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#[track_caller]
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fn context(self, context: impl IntoContext) -> Self::Output {
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// TODO: maybe add a feature for the extra "Option::None" context
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match self {
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Some(t) => Ok(t),
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None => Err(How::new(context))
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}
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//self.into_result_how().map_err(#[inline(never)] move |e| e.context(context))
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}
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}
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