| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/anyhow-1.0.71/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../anyhow/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../anyhow/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! [![github]](https://github.com/dtolnay/anyhow)&ensp;[![crates-io]](https://crates.io/crates/anyhow)&ensp;[![docs-rs]](https://docs.rs/anyhow) |
| //! |
| //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github |
| //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust |
| //! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs |
| //! |
| //! <br> |
| //! |
| //! This library provides [`anyhow::Error`][Error], a trait object based error |
| //! type for easy idiomatic error handling in Rust applications. |
| //! |
| //! <br> |
| //! |
| //! # Details |
| //! |
| //! - Use `Result<T, anyhow::Error>`, or equivalently `anyhow::Result<T>`, as |
| //! the return type of any fallible function. |
| //! |
| //! Within the function, use `?` to easily propagate any error that implements |
| //! the `std::error::Error` trait. |
| //! |
| //! ``` |
| //! # pub trait Deserialize {} |
| //! # |
| //! # mod serde_json { |
| //! # use super::Deserialize; |
| //! # use std::io; |
| //! # |
| //! # pub fn from_str<T: Deserialize>(json: &str) -> io::Result<T> { |
| //! # unimplemented!() |
| //! # } |
| //! # } |
| //! # |
| //! # struct ClusterMap; |
| //! # |
| //! # impl Deserialize for ClusterMap {} |
| //! # |
| //! use anyhow::Result; |
| //! |
| //! fn get_cluster_info() -> Result<ClusterMap> { |
| //! let config = std::fs::read_to_string("cluster.json")?; |
| //! let map: ClusterMap = serde_json::from_str(&config)?; |
| //! Ok(map) |
| //! } |
| //! # |
| //! # fn main() {} |
| //! ``` |
| //! |
| //! - Attach context to help the person troubleshooting the error understand |
| //! where things went wrong. A low-level error like "No such file or |
| //! directory" can be annoying to debug without more context about what higher |
| //! level step the application was in the middle of. |
| //! |
| //! ``` |
| //! # struct It; |
| //! # |
| //! # impl It { |
| //! # fn detach(&self) -> Result<()> { |
| //! # unimplemented!() |
| //! # } |
| //! # } |
| //! # |
| //! use anyhow::{Context, Result}; |
| //! |
| //! fn main() -> Result<()> { |
| //! # return Ok(()); |
| //! # |
| //! # const _: &str = stringify! { |
| //! ... |
| //! # }; |
| //! # |
| //! # let it = It; |
| //! # let path = "./path/to/instrs.json"; |
| //! # |
| //! it.detach().context("Failed to detach the important thing")?; |
| //! |
| //! let content = std::fs::read(path) |
| //! .with_context(|| format!("Failed to read instrs from {}", path))?; |
| //! # |
| //! # const _: &str = stringify! { |
| //! ... |
| //! # }; |
| //! # |
| //! # Ok(()) |
| //! } |
| //! ``` |
| //! |
| //! ```console |
| //! Error: Failed to read instrs from ./path/to/instrs.json |
| //! |
| //! Caused by: |
| //! No such file or directory (os error 2) |
| //! ``` |
| //! |
| //! - Downcasting is supported and can be by value, by shared reference, or by |
| //! mutable reference as needed. |
| //! |
| //! ``` |
| //! # use anyhow::anyhow; |
| //! # use std::fmt::{self, Display}; |
| //! # use std::task::Poll; |
| //! # |
| //! # #[derive(Debug)] |
| //! # enum DataStoreError { |
| //! # Censored(()), |
| //! # } |
| //! # |
| //! # impl Display for DataStoreError { |
| //! # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| //! # unimplemented!() |
| //! # } |
| //! # } |
| //! # |
| //! # impl std::error::Error for DataStoreError {} |
| //! # |
| //! # const REDACTED_CONTENT: () = (); |
| //! # |
| //! # let error = anyhow!("..."); |
| //! # let root_cause = &error; |
| //! # |
| //! # let ret = |
| //! // If the error was caused by redaction, then return a |
| //! // tombstone instead of the content. |
| //! match root_cause.downcast_ref::<DataStoreError>() { |
| //! Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)), |
| //! None => Err(error), |
| //! } |
| //! # ; |
| //! ``` |
| //! |
| //! - If using the nightly channel, or stable with `features = ["backtrace"]`, a |
| //! backtrace is captured and printed with the error if the underlying error |
| //! type does not already provide its own. In order to see backtraces, they |
| //! must be enabled through the environment variables described in |
| //! [`std::backtrace`]: |
| //! |
| //! - If you want panics and errors to both have backtraces, set |
| //! `RUST_BACKTRACE=1`; |
| //! - If you want only errors to have backtraces, set `RUST_LIB_BACKTRACE=1`; |
| //! - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and |
| //! `RUST_LIB_BACKTRACE=0`. |
| //! |
| //! The tracking issue for this feature is [rust-lang/rust#53487]. |
| //! |
| //! [`std::backtrace`]: https://doc.rust-lang.org/std/backtrace/index.html#environment-variables |
| //! [rust-lang/rust#53487]: https://github.com/rust-lang/rust/issues/53487 |
| //! |
| //! - Anyhow works with any error type that has an impl of `std::error::Error`, |
| //! including ones defined in your crate. We do not bundle a `derive(Error)` |
| //! macro but you can write the impls yourself or use a standalone macro like |
| //! [thiserror]. |
| //! |
| //! [thiserror]: https://github.com/dtolnay/thiserror |
| //! |
| //! ``` |
| //! use thiserror::Error; |
| //! |
| //! #[derive(Error, Debug)] |
| //! pub enum FormatError { |
| //! #[error("Invalid header (expected {expected:?}, got {found:?})")] |
| //! InvalidHeader { |
| //! expected: String, |
| //! found: String, |
| //! }, |
| //! #[error("Missing attribute: {0}")] |
| //! MissingAttribute(String), |
| //! } |
| //! ``` |
| //! |
| //! - One-off error messages can be constructed using the `anyhow!` macro, which |
| //! supports string interpolation and produces an `anyhow::Error`. |
| //! |
| //! ``` |
| //! # use anyhow::{anyhow, Result}; |
| //! # |
| //! # fn demo() -> Result<()> { |
| //! # let missing = "..."; |
| //! return Err(anyhow!("Missing attribute: {}", missing)); |
| //! # Ok(()) |
| //! # } |
| //! ``` |
| //! |
| //! A `bail!` macro is provided as a shorthand for the same early return. |
| //! |
| //! ``` |
| //! # use anyhow::{bail, Result}; |
| //! # |
| //! # fn demo() -> Result<()> { |
| //! # let missing = "..."; |
| //! bail!("Missing attribute: {}", missing); |
| //! # Ok(()) |
| //! # } |
| //! ``` |
| //! |
| //! <br> |
| //! |
| //! # No-std support |
| //! |
| //! In no_std mode, the same API is almost all available and works the same way. |
| //! To depend on Anyhow in no_std mode, disable our default enabled "std" |
| //! feature in Cargo.toml. A global allocator is required. |
| //! |
| //! ```toml |
| //! [dependencies] |
| //! anyhow = { version = "1.0", default-features = false } |
| //! ``` |
| //! |
| //! Since the `?`-based error conversions would normally rely on the |
| //! `std::error::Error` trait which is only available through std, no_std mode |
| //! will require an explicit `.map_err(Error::msg)` when working with a |
| //! non-Anyhow error type inside a function that returns Anyhow's error type. |
| |
| </span><span class="attribute">#![doc(html_root_url = <span class="string">"https://docs.rs/anyhow/1.0.71"</span>)] |
| #![cfg_attr(backtrace, feature(error_generic_member_access, provide_any))] |
| #![cfg_attr(doc_cfg, feature(doc_cfg))] |
| #![cfg_attr(not(feature = <span class="string">"std"</span>), no_std)] |
| #![deny(dead_code, unused_imports, unused_mut)] |
| #![allow( |
| clippy::doc_markdown, |
| clippy::enum_glob_use, |
| clippy::explicit_auto_deref, |
| clippy::extra_unused_type_parameters, |
| clippy::let_underscore_untyped, |
| clippy::missing_errors_doc, |
| clippy::missing_panics_doc, |
| clippy::module_name_repetitions, |
| clippy::must_use_candidate, |
| clippy::needless_doctest_main, |
| clippy::new_ret_no_self, |
| clippy::redundant_else, |
| clippy::return_self_not_must_use, |
| clippy::unused_self, |
| clippy::used_underscore_binding, |
| clippy::wildcard_imports, |
| clippy::wrong_self_convention |
| )] |
| |
| </span><span class="kw">extern crate </span>alloc; |
| |
| <span class="attribute">#[macro_use] |
| </span><span class="kw">mod </span>backtrace; |
| <span class="kw">mod </span>chain; |
| <span class="kw">mod </span>context; |
| <span class="kw">mod </span>ensure; |
| <span class="kw">mod </span>error; |
| <span class="kw">mod </span>fmt; |
| <span class="kw">mod </span>kind; |
| <span class="kw">mod </span>macros; |
| <span class="kw">mod </span>ptr; |
| <span class="kw">mod </span>wrapper; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::error::ErrorImpl; |
| <span class="kw">use </span><span class="kw">crate</span>::ptr::Own; |
| <span class="kw">use </span>core::fmt::Display; |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| </span><span class="kw">use </span>core::fmt::Debug; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError; |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| </span><span class="kw">trait </span>StdError: Debug + Display { |
| <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>StdError + <span class="lifetime">'static</span>)> { |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="attribute">#[doc(no_inline)] |
| </span><span class="kw">pub use </span>anyhow <span class="kw">as </span>format_err; |
| |
| <span class="doccomment">/// The `Error` type, a wrapper around a dynamic error type. |
| /// |
| /// `Error` works a lot like `Box<dyn std::error::Error>`, but with these |
| /// differences: |
| /// |
| /// - `Error` requires that the error is `Send`, `Sync`, and `'static`. |
| /// - `Error` guarantees that a backtrace is available, even if the underlying |
| /// error type does not provide one. |
| /// - `Error` is represented as a narrow pointer &mdash; exactly one word in |
| /// size instead of two. |
| /// |
| /// <br> |
| /// |
| /// # Display representations |
| /// |
| /// When you print an error object using "{}" or to_string(), only the outermost |
| /// underlying error or context is printed, not any of the lower level causes. |
| /// This is exactly as if you had called the Display impl of the error from |
| /// which you constructed your anyhow::Error. |
| /// |
| /// ```console |
| /// Failed to read instrs from ./path/to/instrs.json |
| /// ``` |
| /// |
| /// To print causes as well using anyhow's default formatting of causes, use the |
| /// alternate selector "{:#}". |
| /// |
| /// ```console |
| /// Failed to read instrs from ./path/to/instrs.json: No such file or directory (os error 2) |
| /// ``` |
| /// |
| /// The Debug format "{:?}" includes your backtrace if one was captured. Note |
| /// that this is the representation you get by default if you return an error |
| /// from `fn main` instead of printing it explicitly yourself. |
| /// |
| /// ```console |
| /// Error: Failed to read instrs from ./path/to/instrs.json |
| /// |
| /// Caused by: |
| /// No such file or directory (os error 2) |
| /// ``` |
| /// |
| /// and if there is a backtrace available: |
| /// |
| /// ```console |
| /// Error: Failed to read instrs from ./path/to/instrs.json |
| /// |
| /// Caused by: |
| /// No such file or directory (os error 2) |
| /// |
| /// Stack backtrace: |
| /// 0: <E as anyhow::context::ext::StdError>::ext_context |
| /// at /git/anyhow/src/backtrace.rs:26 |
| /// 1: core::result::Result<T,E>::map_err |
| /// at /git/rustc/src/libcore/result.rs:596 |
| /// 2: anyhow::context::<impl anyhow::Context<T,E> for core::result::Result<T,E>>::with_context |
| /// at /git/anyhow/src/context.rs:58 |
| /// 3: testing::main |
| /// at src/main.rs:5 |
| /// 4: std::rt::lang_start |
| /// at /git/rustc/src/libstd/rt.rs:61 |
| /// 5: main |
| /// 6: __libc_start_main |
| /// 7: _start |
| /// ``` |
| /// |
| /// To see a conventional struct-style Debug representation, use "{:#?}". |
| /// |
| /// ```console |
| /// Error { |
| /// context: "Failed to read instrs from ./path/to/instrs.json", |
| /// source: Os { |
| /// code: 2, |
| /// kind: NotFound, |
| /// message: "No such file or directory", |
| /// }, |
| /// } |
| /// ``` |
| /// |
| /// If none of the built-in representations are appropriate and you would prefer |
| /// to render the error and its cause chain yourself, it can be done something |
| /// like this: |
| /// |
| /// ``` |
| /// use anyhow::{Context, Result}; |
| /// |
| /// fn main() { |
| /// if let Err(err) = try_main() { |
| /// eprintln!("ERROR: {}", err); |
| /// err.chain().skip(1).for_each(|cause| eprintln!("because: {}", cause)); |
| /// std::process::exit(1); |
| /// } |
| /// } |
| /// |
| /// fn try_main() -> Result<()> { |
| /// # const IGNORE: &str = stringify! { |
| /// ... |
| /// # }; |
| /// # Ok(()) |
| /// } |
| /// ``` |
| </span><span class="attribute">#[cfg_attr(not(doc), repr(transparent))] |
| </span><span class="kw">pub struct </span>Error { |
| inner: Own<ErrorImpl>, |
| } |
| |
| <span class="doccomment">/// Iterator of a chain of source errors. |
| /// |
| /// This type is the iterator returned by [`Error::chain`]. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use anyhow::Error; |
| /// use std::io; |
| /// |
| /// pub fn underlying_io_error_kind(error: &Error) -> Option<io::ErrorKind> { |
| /// for cause in error.chain() { |
| /// if let Some(io_error) = cause.downcast_ref::<io::Error>() { |
| /// return Some(io_error.kind()); |
| /// } |
| /// } |
| /// None |
| /// } |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"std"</span>)))] |
| #[derive(Clone)] |
| </span><span class="kw">pub struct </span>Chain<<span class="lifetime">'a</span>> { |
| state: <span class="kw">crate</span>::chain::ChainState<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="doccomment">/// `Result<T, Error>` |
| /// |
| /// This is a reasonable return type to use throughout your application but also |
| /// for `fn main`; if you do, failures will be printed along with any |
| /// [context][Context] and a backtrace if one was captured. |
| /// |
| /// `anyhow::Result` may be used with one *or* two type parameters. |
| /// |
| /// ```rust |
| /// use anyhow::Result; |
| /// |
| /// # const IGNORE: &str = stringify! { |
| /// fn demo1() -> Result<T> {...} |
| /// // ^ equivalent to std::result::Result<T, anyhow::Error> |
| /// |
| /// fn demo2() -> Result<T, OtherError> {...} |
| /// // ^ equivalent to std::result::Result<T, OtherError> |
| /// # }; |
| /// ``` |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// # pub trait Deserialize {} |
| /// # |
| /// # mod serde_json { |
| /// # use super::Deserialize; |
| /// # use std::io; |
| /// # |
| /// # pub fn from_str<T: Deserialize>(json: &str) -> io::Result<T> { |
| /// # unimplemented!() |
| /// # } |
| /// # } |
| /// # |
| /// # #[derive(Debug)] |
| /// # struct ClusterMap; |
| /// # |
| /// # impl Deserialize for ClusterMap {} |
| /// # |
| /// use anyhow::Result; |
| /// |
| /// fn main() -> Result<()> { |
| /// # return Ok(()); |
| /// let config = std::fs::read_to_string("cluster.json")?; |
| /// let map: ClusterMap = serde_json::from_str(&config)?; |
| /// println!("cluster info: {:#?}", map); |
| /// Ok(()) |
| /// } |
| /// ``` |
| </span><span class="kw">pub type </span><span class="prelude-ty">Result</span><T, E = Error> = core::result::Result<T, E>; |
| |
| <span class="doccomment">/// Provides the `context` method for `Result`. |
| /// |
| /// This trait is sealed and cannot be implemented for types outside of |
| /// `anyhow`. |
| /// |
| /// <br> |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use anyhow::{Context, Result}; |
| /// use std::fs; |
| /// use std::path::PathBuf; |
| /// |
| /// pub struct ImportantThing { |
| /// path: PathBuf, |
| /// } |
| /// |
| /// impl ImportantThing { |
| /// # const IGNORE: &'static str = stringify! { |
| /// pub fn detach(&mut self) -> Result<()> {...} |
| /// # }; |
| /// # fn detach(&mut self) -> Result<()> { |
| /// # unimplemented!() |
| /// # } |
| /// } |
| /// |
| /// pub fn do_it(mut it: ImportantThing) -> Result<Vec<u8>> { |
| /// it.detach().context("Failed to detach the important thing")?; |
| /// |
| /// let path = &it.path; |
| /// let content = fs::read(path) |
| /// .with_context(|| format!("Failed to read instrs from {}", path.display()))?; |
| /// |
| /// Ok(content) |
| /// } |
| /// ``` |
| /// |
| /// When printed, the outermost context would be printed first and the lower |
| /// level underlying causes would be enumerated below. |
| /// |
| /// ```console |
| /// Error: Failed to read instrs from ./path/to/instrs.json |
| /// |
| /// Caused by: |
| /// No such file or directory (os error 2) |
| /// ``` |
| /// |
| /// Refer to the [Display representations] documentation for other forms in |
| /// which this context chain can be rendered. |
| /// |
| /// [Display representations]: Error#display-representations |
| /// |
| /// <br> |
| /// |
| /// # Effect on downcasting |
| /// |
| /// After attaching context of type `C` onto an error of type `E`, the resulting |
| /// `anyhow::Error` may be downcast to `C` **or** to `E`. |
| /// |
| /// That is, in codebases that rely on downcasting, Anyhow's context supports |
| /// both of the following use cases: |
| /// |
| /// - **Attaching context whose type is insignificant onto errors whose type |
| /// is used in downcasts.** |
| /// |
| /// In other error libraries whose context is not designed this way, it can |
| /// be risky to introduce context to existing code because new context might |
| /// break existing working downcasts. In Anyhow, any downcast that worked |
| /// before adding context will continue to work after you add a context, so |
| /// you should freely add human-readable context to errors wherever it would |
| /// be helpful. |
| /// |
| /// ``` |
| /// # use anyhow::bail; |
| /// # use thiserror::Error; |
| /// # |
| /// # #[derive(Error, Debug)] |
| /// # #[error("???")] |
| /// # struct SuspiciousError; |
| /// # |
| /// # fn helper() -> Result<()> { |
| /// # bail!(SuspiciousError); |
| /// # } |
| /// # |
| /// use anyhow::{Context, Result}; |
| /// |
| /// fn do_it() -> Result<()> { |
| /// helper().context("Failed to complete the work")?; |
| /// # const IGNORE: &str = stringify! { |
| /// ... |
| /// # }; |
| /// # unreachable!() |
| /// } |
| /// |
| /// fn main() { |
| /// let err = do_it().unwrap_err(); |
| /// if let Some(e) = err.downcast_ref::<SuspiciousError>() { |
| /// // If helper() returned SuspiciousError, this downcast will |
| /// // correctly succeed even with the context in between. |
| /// # return; |
| /// } |
| /// # panic!("expected downcast to succeed"); |
| /// } |
| /// ``` |
| /// |
| /// - **Attaching context whose type is used in downcasts onto errors whose |
| /// type is insignificant.** |
| /// |
| /// Some codebases prefer to use machine-readable context to categorize |
| /// lower level errors in a way that will be actionable to higher levels of |
| /// the application. |
| /// |
| /// ``` |
| /// # use anyhow::bail; |
| /// # use thiserror::Error; |
| /// # |
| /// # #[derive(Error, Debug)] |
| /// # #[error("???")] |
| /// # struct HelperFailed; |
| /// # |
| /// # fn helper() -> Result<()> { |
| /// # bail!("no such file or directory"); |
| /// # } |
| /// # |
| /// use anyhow::{Context, Result}; |
| /// |
| /// fn do_it() -> Result<()> { |
| /// helper().context(HelperFailed)?; |
| /// # const IGNORE: &str = stringify! { |
| /// ... |
| /// # }; |
| /// # unreachable!() |
| /// } |
| /// |
| /// fn main() { |
| /// let err = do_it().unwrap_err(); |
| /// if let Some(e) = err.downcast_ref::<HelperFailed>() { |
| /// // If helper failed, this downcast will succeed because |
| /// // HelperFailed is the context that has been attached to |
| /// // that error. |
| /// # return; |
| /// } |
| /// # panic!("expected downcast to succeed"); |
| /// } |
| /// ``` |
| </span><span class="kw">pub trait </span>Context<T, E>: context::private::Sealed { |
| <span class="doccomment">/// Wrap the error value with additional context. |
| </span><span class="kw">fn </span>context<C>(<span class="self">self</span>, context: C) -> <span class="prelude-ty">Result</span><T, Error> |
| <span class="kw">where |
| </span>C: Display + Send + Sync + <span class="lifetime">'static</span>; |
| |
| <span class="doccomment">/// Wrap the error value with additional context that is evaluated lazily |
| /// only once an error does occur. |
| </span><span class="kw">fn </span>with_context<C, F>(<span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><T, Error> |
| <span class="kw">where |
| </span>C: Display + Send + Sync + <span class="lifetime">'static</span>, |
| F: FnOnce() -> C; |
| } |
| |
| <span class="doccomment">/// Equivalent to Ok::<_, anyhow::Error>(value). |
| /// |
| /// This simplifies creation of an anyhow::Result in places where type inference |
| /// cannot deduce the `E` type of the result &mdash; without needing to write |
| /// `Ok::<_, anyhow::Error>(value)`. |
| /// |
| /// One might think that `anyhow::Result::Ok(value)` would work in such cases |
| /// but it does not. |
| /// |
| /// ```console |
| /// error[E0282]: type annotations needed for `std::result::Result<i32, E>` |
| /// --> src/main.rs:11:13 |
| /// | |
| /// 11 | let _ = anyhow::Result::Ok(1); |
| /// | - ^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `E` declared on the enum `Result` |
| /// | | |
| /// | consider giving this pattern the explicit type `std::result::Result<i32, E>`, where the type parameter `E` is specified |
| /// ``` |
| </span><span class="attribute">#[allow(non_snake_case)] |
| </span><span class="kw">pub fn </span><span class="prelude-val">Ok</span><T>(t: T) -> <span class="prelude-ty">Result</span><T> { |
| Result::Ok(t) |
| } |
| |
| <span class="comment">// Not public API. Referenced by macro-generated code. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub mod </span>__private { |
| <span class="kw">use </span><span class="kw">crate</span>::Error; |
| <span class="kw">use </span>alloc::fmt; |
| <span class="kw">use </span>core::fmt::Arguments; |
| |
| <span class="kw">pub use </span><span class="kw">crate</span>::ensure::{BothDebug, NotBothDebug}; |
| <span class="kw">pub use </span>alloc::format; |
| <span class="kw">pub use </span>core::result::Result::Err; |
| <span class="kw">pub use </span>core::{concat, format_args, stringify}; |
| |
| <span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub mod </span>kind { |
| <span class="kw">pub use </span><span class="kw">crate</span>::kind::{AdhocKind, TraitKind}; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">pub use </span><span class="kw">crate</span>::kind::BoxedKind; |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[inline] |
| #[cold] |
| </span><span class="kw">pub fn </span>format_err(args: Arguments) -> Error { |
| <span class="attribute">#[cfg(anyhow_no_fmt_arguments_as_str)] |
| </span><span class="kw">let </span>fmt_arguments_as_str = <span class="prelude-val">None</span>::<<span class="kw-2">&</span>str>; |
| <span class="attribute">#[cfg(not(anyhow_no_fmt_arguments_as_str))] |
| </span><span class="kw">let </span>fmt_arguments_as_str = args.as_str(); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(message) = fmt_arguments_as_str { |
| <span class="comment">// anyhow!("literal"), can downcast to &'static str |
| </span>Error::msg(message) |
| } <span class="kw">else </span>{ |
| <span class="comment">// anyhow!("interpolate {var}"), can downcast to String |
| </span>Error::msg(fmt::format(args)) |
| } |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[inline] |
| #[cold] |
| #[must_use] |
| </span><span class="kw">pub fn </span>must_use(error: Error) -> Error { |
| error |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="anyhow" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |