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| </pre><pre class="rust"><code><span class="kw">use crate</span>::{ |
| fill::Slot, |
| std::{any::Any, error}, |
| ValueBag, |
| }; |
| |
| <span class="kw">use </span><span class="kw">super</span>::Internal; |
| |
| <span class="kw">impl</span><<span class="lifetime">'v</span>> ValueBag<<span class="lifetime">'v</span>> { |
| <span class="doccomment">/// Get a value from an error. |
| </span><span class="kw">pub fn </span>capture_error<T>(value: <span class="kw-2">&</span><span class="lifetime">'v </span>T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: error::Error + <span class="lifetime">'static</span>, |
| { |
| ValueBag { |
| inner: Internal::Error(value), |
| } |
| } |
| |
| <span class="doccomment">/// Get a value from an erased value. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>from_dyn_error(value: <span class="kw-2">&</span><span class="lifetime">'v </span>(<span class="kw">dyn </span>error::Error + <span class="lifetime">'static</span>)) -> <span class="self">Self </span>{ |
| ValueBag { |
| inner: Internal::AnonError(value), |
| } |
| } |
| |
| <span class="doccomment">/// Try get an error from this value. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>to_borrowed_error(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'v </span>(<span class="kw">dyn </span>Error + <span class="lifetime">'static</span>)> { |
| <span class="kw">match </span><span class="self">self</span>.inner { |
| Internal::Error(value) => <span class="prelude-val">Some</span>(value.as_super()), |
| Internal::AnonError(value) => <span class="prelude-val">Some</span>(value), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"error"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>DowncastError { |
| <span class="kw">fn </span>as_any(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="kw">dyn </span>Any; |
| <span class="kw">fn </span>as_super(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>(<span class="kw">dyn </span>error::Error + <span class="lifetime">'static</span>); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"error"</span>)] |
| </span><span class="kw">impl</span><T: error::Error + <span class="lifetime">'static</span>> DowncastError <span class="kw">for </span>T { |
| <span class="kw">fn </span>as_any(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="kw">dyn </span>Any { |
| <span class="self">self |
| </span>} |
| |
| <span class="kw">fn </span>as_super(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>(<span class="kw">dyn </span>error::Error + <span class="lifetime">'static</span>) { |
| <span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, <span class="lifetime">'f</span>> Slot<<span class="lifetime">'s</span>, <span class="lifetime">'f</span>> { |
| <span class="doccomment">/// Fill the slot with an error. |
| /// |
| /// The given value doesn't need to satisfy any particular lifetime constraints. |
| </span><span class="kw">pub fn </span>fill_error<T>(<span class="self">self</span>, value: T) -> <span class="prelude-ty">Result</span><(), <span class="kw">crate</span>::Error> |
| <span class="kw">where |
| </span>T: error::Error + <span class="lifetime">'static</span>, |
| { |
| <span class="self">self</span>.fill(|visitor| visitor.error(<span class="kw-2">&</span>value)) |
| } |
| |
| <span class="doccomment">/// Fill the slot with an error. |
| </span><span class="kw">pub fn </span>fill_dyn_error(<span class="self">self</span>, value: <span class="kw-2">&</span>(<span class="kw">dyn </span>error::Error + <span class="lifetime">'static</span>)) -> <span class="prelude-ty">Result</span><(), <span class="kw">crate</span>::Error> { |
| <span class="self">self</span>.fill(|visitor| visitor.error(value)) |
| } |
| } |
| |
| <span class="kw">pub use </span><span class="self">self</span>::error::Error; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"owned"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>owned { |
| <span class="kw">use </span><span class="kw">crate</span>::std::{boxed::Box, error, fmt, string::ToString}; |
| |
| <span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>OwnedError { |
| display: Box<str>, |
| source: <span class="prelude-ty">Option</span><Box<OwnedError>>, |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>OwnedError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| fmt::Display::fmt(<span class="kw-2">&</span><span class="self">self</span>.display, f) |
| } |
| } |
| |
| <span class="kw">impl </span>error::Error <span class="kw">for </span>OwnedError { |
| <span class="kw">fn </span>source(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>(<span class="kw">dyn </span>error::Error + <span class="lifetime">'static</span>)> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>source) = <span class="self">self</span>.source { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&**</span>source) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>buffer(err: <span class="kw-2">&</span>(<span class="kw">dyn </span>error::Error + <span class="lifetime">'static</span>)) -> OwnedError { |
| OwnedError { |
| display: err.to_string().into(), |
| source: err.source().map(buffer).map(Box::new), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="attribute">#[cfg(target_arch = <span class="string">"wasm32"</span>)] |
| </span><span class="kw">use </span>wasm_bindgen_test::<span class="kw-2">*</span>; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">use crate</span>::{ |
| std::{io, string::ToString}, |
| test::<span class="kw-2">*</span>, |
| }; |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>error_capture() { |
| <span class="kw">let </span>err = io::Error::from(io::ErrorKind::Other); |
| |
| <span class="macro">assert_eq!</span>( |
| err.to_string(), |
| ValueBag::capture_error(<span class="kw-2">&</span>err) |
| .to_borrowed_error() |
| .expect(<span class="string">"invalid value"</span>) |
| .to_string() |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| err.to_string(), |
| ValueBag::from_dyn_error(<span class="kw-2">&</span>err) |
| .to_borrowed_error() |
| .expect(<span class="string">"invalid value"</span>) |
| .to_string() |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>error_downcast() { |
| <span class="kw">let </span>err = io::Error::from(io::ErrorKind::Other); |
| |
| <span class="macro">assert!</span>(ValueBag::capture_error(<span class="kw-2">&</span>err) |
| .downcast_ref::<io::Error>() |
| .is_some()); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>error_visit() { |
| <span class="kw">let </span>err = io::Error::from(io::ErrorKind::Other); |
| |
| ValueBag::from_dyn_error(<span class="kw-2">&</span>err) |
| .visit(TestVisit::default()) |
| .expect(<span class="string">"failed to visit value"</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="value_bag" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
