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20 lines
516 B
Markdown
20 lines
516 B
Markdown
# Downcast the Errors
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`std::error::Error` comes with some helper methods to get to the original object of the
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`&(dyn Error + 'static)` returned by `.source()`.
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~~~rust,ignore
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pub fn downcast_ref<T: Error + 'static>(&self) -> Option<&T>
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pub fn downcast_mut<T: Error + 'static>(&mut self) -> Option<&mut T>
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~~~
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This is how it looks like, when using those:
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~~~rust
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use crate::chainerror::*;
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{{#include ../examples/tutorial6.rs:2:}}
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# #[allow(dead_code)]
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# mod chainerror {
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{{#includecomment ../src/lib.rs}}
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# }
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~~~ |