| <!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/either-1.8.1/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="../../either/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="../../either/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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| <span id="1470">1470</span> |
| <span id="1471">1471</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! The enum [`Either`] with variants `Left` and `Right` is a general purpose |
| //! sum type with two cases. |
| //! |
| //! [`Either`]: enum.Either.html |
| //! |
| //! **Crate features:** |
| //! |
| //! * `"use_std"` |
| //! Enabled by default. Disable to make the library `#![no_std]`. |
| //! |
| //! * `"serde"` |
| //! Disabled by default. Enable to `#[derive(Serialize, Deserialize)]` for `Either` |
| //! |
| |
| </span><span class="attribute">#![doc(html_root_url = <span class="string">"https://docs.rs/either/1/"</span>)] |
| #![no_std] |
| |
| #[cfg(any(test, feature = <span class="string">"use_std"</span>))] |
| </span><span class="kw">extern crate </span>std; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"serde"</span>)] |
| </span><span class="kw">pub mod </span>serde_untagged; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"serde"</span>)] |
| </span><span class="kw">pub mod </span>serde_untagged_optional; |
| |
| <span class="kw">use </span>core::convert::{AsMut, AsRef}; |
| <span class="kw">use </span>core::fmt; |
| <span class="kw">use </span>core::future::Future; |
| <span class="kw">use </span>core::iter; |
| <span class="kw">use </span>core::ops::Deref; |
| <span class="kw">use </span>core::ops::DerefMut; |
| <span class="kw">use </span>core::pin::Pin; |
| |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"use_std"</span>))] |
| </span><span class="kw">use </span>std::error::Error; |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"use_std"</span>))] |
| </span><span class="kw">use </span>std::io::{<span class="self">self</span>, BufRead, Read, Seek, SeekFrom, Write}; |
| |
| <span class="kw">pub use </span><span class="kw">crate</span>::Either::{Left, Right}; |
| |
| <span class="doccomment">/// The enum `Either` with variants `Left` and `Right` is a general purpose |
| /// sum type with two cases. |
| /// |
| /// The `Either` type is symmetric and treats its variants the same way, without |
| /// preference. |
| /// (For representing success or error, use the regular `Result` enum instead.) |
| </span><span class="attribute">#[cfg_attr(feature = <span class="string">"serde"</span>, derive(serde::Serialize, serde::Deserialize))] |
| #[derive(Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)] |
| </span><span class="kw">pub enum </span>Either<L, R> { |
| <span class="doccomment">/// A value of type `L`. |
| </span>Left(L), |
| <span class="doccomment">/// A value of type `R`. |
| </span>Right(R), |
| } |
| |
| <span class="doccomment">/// Evaluate the provided expression for both [`Either::Left`] and [`Either::Right`]. |
| /// |
| /// This macro is useful in cases where both sides of [`Either`] can be interacted with |
| /// in the same way even though the don't share the same type. |
| /// |
| /// Syntax: `either::for_both!(` *expression* `,` *pattern* `=>` *expression* `)` |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use either::Either; |
| /// |
| /// fn length(owned_or_borrowed: Either<String, &'static str>) -> usize { |
| /// either::for_both!(owned_or_borrowed, s => s.len()) |
| /// } |
| /// |
| /// fn main() { |
| /// let borrowed = Either::Right("Hello world!"); |
| /// let owned = Either::Left("Hello world!".to_owned()); |
| /// |
| /// assert_eq!(length(borrowed), 12); |
| /// assert_eq!(length(owned), 12); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[macro_export] |
| </span><span class="macro">macro_rules! </span>for_both { |
| (<span class="macro-nonterminal">$value</span>:expr, <span class="macro-nonterminal">$pattern</span>:pat => <span class="macro-nonterminal">$result</span>:expr) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$value </span>{ |
| <span class="macro-nonterminal">$crate::Either::Left</span>(<span class="macro-nonterminal">$pattern</span>) => <span class="macro-nonterminal">$result</span>, |
| <span class="macro-nonterminal">$crate::Either::Right</span>(<span class="macro-nonterminal">$pattern</span>) => <span class="macro-nonterminal">$result</span>, |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// Macro for unwrapping the left side of an `Either`, which fails early |
| /// with the opposite side. Can only be used in functions that return |
| /// `Either` because of the early return of `Right` that it provides. |
| /// |
| /// See also `try_right!` for its dual, which applies the same just to the |
| /// right side. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use either::{Either, Left, Right}; |
| /// |
| /// fn twice(wrapper: Either<u32, &str>) -> Either<u32, &str> { |
| /// let value = either::try_left!(wrapper); |
| /// Left(value * 2) |
| /// } |
| /// |
| /// fn main() { |
| /// assert_eq!(twice(Left(2)), Left(4)); |
| /// assert_eq!(twice(Right("ups")), Right("ups")); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[macro_export] |
| </span><span class="macro">macro_rules! </span>try_left { |
| (<span class="macro-nonterminal">$expr</span>:expr) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$expr </span>{ |
| <span class="macro-nonterminal">$crate::Left</span>(val) => val, |
| <span class="macro-nonterminal">$crate::Right</span>(err) => <span class="kw">return </span><span class="macro-nonterminal">$crate::Right</span>(::core::convert::From::from(err)), |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// Dual to `try_left!`, see its documentation for more information. |
| </span><span class="attribute">#[macro_export] |
| </span><span class="macro">macro_rules! </span>try_right { |
| (<span class="macro-nonterminal">$expr</span>:expr) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$expr </span>{ |
| <span class="macro-nonterminal">$crate::Left</span>(err) => <span class="kw">return </span><span class="macro-nonterminal">$crate::Left</span>(::core::convert::From::from(err)), |
| <span class="macro-nonterminal">$crate::Right</span>(val) => val, |
| } |
| }; |
| } |
| |
| <span class="kw">impl</span><L: Clone, R: Clone> Clone <span class="kw">for </span>Either<L, R> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(inner) => Left(inner.clone()), |
| Right(inner) => Right(inner.clone()), |
| } |
| } |
| |
| <span class="kw">fn </span>clone_from(<span class="kw-2">&mut </span><span class="self">self</span>, source: <span class="kw-2">&</span><span class="self">Self</span>) { |
| <span class="kw">match </span>(<span class="self">self</span>, source) { |
| (Left(dest), Left(source)) => dest.clone_from(source), |
| (Right(dest), Right(source)) => dest.clone_from(source), |
| (dest, source) => <span class="kw-2">*</span>dest = source.clone(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><L, R> Either<L, R> { |
| <span class="doccomment">/// Return true if the value is the `Left` variant. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let values = [Left(1), Right("the right value")]; |
| /// assert_eq!(values[0].is_left(), true); |
| /// assert_eq!(values[1].is_left(), false); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_left(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Left(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| Right(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Return true if the value is the `Right` variant. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let values = [Left(1), Right("the right value")]; |
| /// assert_eq!(values[0].is_right(), false); |
| /// assert_eq!(values[1].is_right(), true); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_right(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| !<span class="self">self</span>.is_left() |
| } |
| |
| <span class="doccomment">/// Convert the left side of `Either<L, R>` to an `Option<L>`. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, ()> = Left("some value"); |
| /// assert_eq!(left.left(), Some("some value")); |
| /// |
| /// let right: Either<(), _> = Right(321); |
| /// assert_eq!(right.left(), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>left(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><L> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => <span class="prelude-val">Some</span>(l), |
| Right(<span class="kw">_</span>) => <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Convert the right side of `Either<L, R>` to an `Option<R>`. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, ()> = Left("some value"); |
| /// assert_eq!(left.right(), None); |
| /// |
| /// let right: Either<(), _> = Right(321); |
| /// assert_eq!(right.right(), Some(321)); |
| /// ``` |
| </span><span class="kw">pub fn </span>right(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><R> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(<span class="kw">_</span>) => <span class="prelude-val">None</span>, |
| Right(r) => <span class="prelude-val">Some</span>(r), |
| } |
| } |
| |
| <span class="doccomment">/// Convert `&Either<L, R>` to `Either<&L, &R>`. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, ()> = Left("some value"); |
| /// assert_eq!(left.as_ref(), Left(&"some value")); |
| /// |
| /// let right: Either<(), _> = Right("some value"); |
| /// assert_eq!(right.as_ref(), Right(&"some value")); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> Either<<span class="kw-2">&</span>L, <span class="kw-2">&</span>R> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Left(<span class="kw-2">ref </span>inner) => Left(inner), |
| Right(<span class="kw-2">ref </span>inner) => Right(inner), |
| } |
| } |
| |
| <span class="doccomment">/// Convert `&mut Either<L, R>` to `Either<&mut L, &mut R>`. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// fn mutate_left(value: &mut Either<u32, u32>) { |
| /// if let Some(l) = value.as_mut().left() { |
| /// *l = 999; |
| /// } |
| /// } |
| /// |
| /// let mut left = Left(123); |
| /// let mut right = Right(123); |
| /// mutate_left(&mut left); |
| /// mutate_left(&mut right); |
| /// assert_eq!(left, Left(999)); |
| /// assert_eq!(right, Right(123)); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> Either<<span class="kw-2">&mut </span>L, <span class="kw-2">&mut </span>R> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Left(<span class="kw-2">ref mut </span>inner) => Left(inner), |
| Right(<span class="kw-2">ref mut </span>inner) => Right(inner), |
| } |
| } |
| |
| <span class="doccomment">/// Convert `Pin<&Either<L, R>>` to `Either<Pin<&L>, Pin<&R>>`, |
| /// pinned projections of the inner variants. |
| </span><span class="kw">pub fn </span>as_pin_ref(<span class="self">self</span>: Pin<<span class="kw-2">&</span><span class="self">Self</span>>) -> Either<Pin<<span class="kw-2">&</span>L>, Pin<<span class="kw-2">&</span>R>> { |
| <span class="comment">// SAFETY: We can use `new_unchecked` because the `inner` parts are |
| // guaranteed to be pinned, as they come from `self` which is pinned. |
| </span><span class="kw">unsafe </span>{ |
| <span class="kw">match </span><span class="kw-2">*</span>Pin::get_ref(<span class="self">self</span>) { |
| Left(<span class="kw-2">ref </span>inner) => Left(Pin::new_unchecked(inner)), |
| Right(<span class="kw-2">ref </span>inner) => Right(Pin::new_unchecked(inner)), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Convert `Pin<&mut Either<L, R>>` to `Either<Pin<&mut L>, Pin<&mut R>>`, |
| /// pinned projections of the inner variants. |
| </span><span class="kw">pub fn </span>as_pin_mut(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>) -> Either<Pin<<span class="kw-2">&mut </span>L>, Pin<<span class="kw-2">&mut </span>R>> { |
| <span class="comment">// SAFETY: `get_unchecked_mut` is fine because we don't move anything. |
| // We can use `new_unchecked` because the `inner` parts are guaranteed |
| // to be pinned, as they come from `self` which is pinned, and we never |
| // offer an unpinned `&mut L` or `&mut R` through `Pin<&mut Self>`. We |
| // also don't have an implementation of `Drop`, nor manual `Unpin`. |
| </span><span class="kw">unsafe </span>{ |
| <span class="kw">match </span><span class="kw-2">*</span>Pin::get_unchecked_mut(<span class="self">self</span>) { |
| Left(<span class="kw-2">ref mut </span>inner) => Left(Pin::new_unchecked(inner)), |
| Right(<span class="kw-2">ref mut </span>inner) => Right(Pin::new_unchecked(inner)), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Convert `Either<L, R>` to `Either<R, L>`. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, ()> = Left(123); |
| /// assert_eq!(left.flip(), Right(123)); |
| /// |
| /// let right: Either<(), _> = Right("some value"); |
| /// assert_eq!(right.flip(), Left("some value")); |
| /// ``` |
| </span><span class="kw">pub fn </span>flip(<span class="self">self</span>) -> Either<R, L> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => Right(l), |
| Right(r) => Left(r), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the function `f` on the value in the `Left` variant if it is present rewrapping the |
| /// result in `Left`. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, u32> = Left(123); |
| /// assert_eq!(left.map_left(|x| x * 2), Left(246)); |
| /// |
| /// let right: Either<u32, _> = Right(123); |
| /// assert_eq!(right.map_left(|x| x * 2), Right(123)); |
| /// ``` |
| </span><span class="kw">pub fn </span>map_left<F, M>(<span class="self">self</span>, f: F) -> Either<M, R> |
| <span class="kw">where |
| </span>F: FnOnce(L) -> M, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => Left(f(l)), |
| Right(r) => Right(r), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the function `f` on the value in the `Right` variant if it is present rewrapping the |
| /// result in `Right`. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, u32> = Left(123); |
| /// assert_eq!(left.map_right(|x| x * 2), Left(123)); |
| /// |
| /// let right: Either<u32, _> = Right(123); |
| /// assert_eq!(right.map_right(|x| x * 2), Right(246)); |
| /// ``` |
| </span><span class="kw">pub fn </span>map_right<F, S>(<span class="self">self</span>, f: F) -> Either<L, S> |
| <span class="kw">where |
| </span>F: FnOnce(R) -> S, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => Left(l), |
| Right(r) => Right(f(r)), |
| } |
| } |
| |
| <span class="doccomment">/// Apply one of two functions depending on contents, unifying their result. If the value is |
| /// `Left(L)` then the first function `f` is applied; if it is `Right(R)` then the second |
| /// function `g` is applied. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// fn square(n: u32) -> i32 { (n * n) as i32 } |
| /// fn negate(n: i32) -> i32 { -n } |
| /// |
| /// let left: Either<u32, i32> = Left(4); |
| /// assert_eq!(left.either(square, negate), 16); |
| /// |
| /// let right: Either<u32, i32> = Right(-4); |
| /// assert_eq!(right.either(square, negate), 4); |
| /// ``` |
| </span><span class="kw">pub fn </span>either<F, G, T>(<span class="self">self</span>, f: F, g: G) -> T |
| <span class="kw">where |
| </span>F: FnOnce(L) -> T, |
| G: FnOnce(R) -> T, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => f(l), |
| Right(r) => g(r), |
| } |
| } |
| |
| <span class="doccomment">/// Like `either`, but provide some context to whichever of the |
| /// functions ends up being called. |
| /// |
| /// ``` |
| /// // In this example, the context is a mutable reference |
| /// use either::*; |
| /// |
| /// let mut result = Vec::new(); |
| /// |
| /// let values = vec![Left(2), Right(2.7)]; |
| /// |
| /// for value in values { |
| /// value.either_with(&mut result, |
| /// |ctx, integer| ctx.push(integer), |
| /// |ctx, real| ctx.push(f64::round(real) as i32)); |
| /// } |
| /// |
| /// assert_eq!(result, vec![2, 3]); |
| /// ``` |
| </span><span class="kw">pub fn </span>either_with<Ctx, F, G, T>(<span class="self">self</span>, ctx: Ctx, f: F, g: G) -> T |
| <span class="kw">where |
| </span>F: FnOnce(Ctx, L) -> T, |
| G: FnOnce(Ctx, R) -> T, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => f(ctx, l), |
| Right(r) => g(ctx, r), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the function `f` on the value in the `Left` variant if it is present. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, u32> = Left(123); |
| /// assert_eq!(left.left_and_then::<_,()>(|x| Right(x * 2)), Right(246)); |
| /// |
| /// let right: Either<u32, _> = Right(123); |
| /// assert_eq!(right.left_and_then(|x| Right::<(), _>(x * 2)), Right(123)); |
| /// ``` |
| </span><span class="kw">pub fn </span>left_and_then<F, S>(<span class="self">self</span>, f: F) -> Either<S, R> |
| <span class="kw">where |
| </span>F: FnOnce(L) -> Either<S, R>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => f(l), |
| Right(r) => Right(r), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the function `f` on the value in the `Right` variant if it is present. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, u32> = Left(123); |
| /// assert_eq!(left.right_and_then(|x| Right(x * 2)), Left(123)); |
| /// |
| /// let right: Either<u32, _> = Right(123); |
| /// assert_eq!(right.right_and_then(|x| Right(x * 2)), Right(246)); |
| /// ``` |
| </span><span class="kw">pub fn </span>right_and_then<F, S>(<span class="self">self</span>, f: F) -> Either<L, S> |
| <span class="kw">where |
| </span>F: FnOnce(R) -> Either<L, S>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => Left(l), |
| Right(r) => f(r), |
| } |
| } |
| |
| <span class="doccomment">/// Convert the inner value to an iterator. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, Vec<u32>> = Left(vec![1, 2, 3, 4, 5]); |
| /// let mut right: Either<Vec<u32>, _> = Right(vec![]); |
| /// right.extend(left.into_iter()); |
| /// assert_eq!(right, Right(vec![1, 2, 3, 4, 5])); |
| /// ``` |
| </span><span class="attribute">#[allow(clippy::should_implement_trait)] |
| </span><span class="kw">pub fn </span>into_iter(<span class="self">self</span>) -> Either<L::IntoIter, R::IntoIter> |
| <span class="kw">where |
| </span>L: IntoIterator, |
| R: IntoIterator<Item = L::Item>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => Left(l.into_iter()), |
| Right(r) => Right(r.into_iter()), |
| } |
| } |
| |
| <span class="doccomment">/// Return left value or given value |
| /// |
| /// Arguments passed to `left_or` are eagerly evaluated; if you are passing |
| /// the result of a function call, it is recommended to use [`left_or_else`], |
| /// which is lazily evaluated. |
| /// |
| /// [`left_or_else`]: #method.left_or_else |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let left: Either<&str, &str> = Left("left"); |
| /// assert_eq!(left.left_or("foo"), "left"); |
| /// |
| /// let right: Either<&str, &str> = Right("right"); |
| /// assert_eq!(right.left_or("left"), "left"); |
| /// ``` |
| </span><span class="kw">pub fn </span>left_or(<span class="self">self</span>, other: L) -> L { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(l) => l, |
| Either::Right(<span class="kw">_</span>) => other, |
| } |
| } |
| |
| <span class="doccomment">/// Return left or a default |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let left: Either<String, u32> = Left("left".to_string()); |
| /// assert_eq!(left.left_or_default(), "left"); |
| /// |
| /// let right: Either<String, u32> = Right(42); |
| /// assert_eq!(right.left_or_default(), String::default()); |
| /// ``` |
| </span><span class="kw">pub fn </span>left_or_default(<span class="self">self</span>) -> L |
| <span class="kw">where |
| </span>L: Default, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(l) => l, |
| Either::Right(<span class="kw">_</span>) => L::default(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns left value or computes it from a closure |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let left: Either<String, u32> = Left("3".to_string()); |
| /// assert_eq!(left.left_or_else(|_| unreachable!()), "3"); |
| /// |
| /// let right: Either<String, u32> = Right(3); |
| /// assert_eq!(right.left_or_else(|x| x.to_string()), "3"); |
| /// ``` |
| </span><span class="kw">pub fn </span>left_or_else<F>(<span class="self">self</span>, f: F) -> L |
| <span class="kw">where |
| </span>F: FnOnce(R) -> L, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(l) => l, |
| Either::Right(r) => f(r), |
| } |
| } |
| |
| <span class="doccomment">/// Return right value or given value |
| /// |
| /// Arguments passed to `right_or` are eagerly evaluated; if you are passing |
| /// the result of a function call, it is recommended to use [`right_or_else`], |
| /// which is lazily evaluated. |
| /// |
| /// [`right_or_else`]: #method.right_or_else |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let right: Either<&str, &str> = Right("right"); |
| /// assert_eq!(right.right_or("foo"), "right"); |
| /// |
| /// let left: Either<&str, &str> = Left("left"); |
| /// assert_eq!(left.right_or("right"), "right"); |
| /// ``` |
| </span><span class="kw">pub fn </span>right_or(<span class="self">self</span>, other: R) -> R { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(<span class="kw">_</span>) => other, |
| Either::Right(r) => r, |
| } |
| } |
| |
| <span class="doccomment">/// Return right or a default |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let left: Either<String, u32> = Left("left".to_string()); |
| /// assert_eq!(left.right_or_default(), u32::default()); |
| /// |
| /// let right: Either<String, u32> = Right(42); |
| /// assert_eq!(right.right_or_default(), 42); |
| /// ``` |
| </span><span class="kw">pub fn </span>right_or_default(<span class="self">self</span>) -> R |
| <span class="kw">where |
| </span>R: Default, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(<span class="kw">_</span>) => R::default(), |
| Either::Right(r) => r, |
| } |
| } |
| |
| <span class="doccomment">/// Returns right value or computes it from a closure |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let left: Either<String, u32> = Left("3".to_string()); |
| /// assert_eq!(left.right_or_else(|x| x.parse().unwrap()), 3); |
| /// |
| /// let right: Either<String, u32> = Right(3); |
| /// assert_eq!(right.right_or_else(|_| unreachable!()), 3); |
| /// ``` |
| </span><span class="kw">pub fn </span>right_or_else<F>(<span class="self">self</span>, f: F) -> R |
| <span class="kw">where |
| </span>F: FnOnce(L) -> R, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(l) => f(l), |
| Either::Right(r) => r, |
| } |
| } |
| |
| <span class="doccomment">/// Returns the left value |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let left: Either<_, ()> = Left(3); |
| /// assert_eq!(left.unwrap_left(), 3); |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// When `Either` is a `Right` value |
| /// |
| /// ```should_panic |
| /// # use either::*; |
| /// let right: Either<(), _> = Right(3); |
| /// right.unwrap_left(); |
| /// ``` |
| </span><span class="kw">pub fn </span>unwrap_left(<span class="self">self</span>) -> L |
| <span class="kw">where |
| </span>R: core::fmt::Debug, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(l) => l, |
| Either::Right(r) => { |
| <span class="macro">panic!</span>(<span class="string">"called `Either::unwrap_left()` on a `Right` value: {:?}"</span>, r) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Returns the right value |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let right: Either<(), _> = Right(3); |
| /// assert_eq!(right.unwrap_right(), 3); |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// When `Either` is a `Left` value |
| /// |
| /// ```should_panic |
| /// # use either::*; |
| /// let left: Either<_, ()> = Left(3); |
| /// left.unwrap_right(); |
| /// ``` |
| </span><span class="kw">pub fn </span>unwrap_right(<span class="self">self</span>) -> R |
| <span class="kw">where |
| </span>L: core::fmt::Debug, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Right(r) => r, |
| Either::Left(l) => <span class="macro">panic!</span>(<span class="string">"called `Either::unwrap_right()` on a `Left` value: {:?}"</span>, l), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the left value |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let left: Either<_, ()> = Left(3); |
| /// assert_eq!(left.expect_left("value was Right"), 3); |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// When `Either` is a `Right` value |
| /// |
| /// ```should_panic |
| /// # use either::*; |
| /// let right: Either<(), _> = Right(3); |
| /// right.expect_left("value was Right"); |
| /// ``` |
| </span><span class="kw">pub fn </span>expect_left(<span class="self">self</span>, msg: <span class="kw-2">&</span>str) -> L |
| <span class="kw">where |
| </span>R: core::fmt::Debug, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(l) => l, |
| Either::Right(r) => <span class="macro">panic!</span>(<span class="string">"{}: {:?}"</span>, msg, r), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the right value |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// let right: Either<(), _> = Right(3); |
| /// assert_eq!(right.expect_right("value was Left"), 3); |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// When `Either` is a `Left` value |
| /// |
| /// ```should_panic |
| /// # use either::*; |
| /// let left: Either<_, ()> = Left(3); |
| /// left.expect_right("value was Right"); |
| /// ``` |
| </span><span class="kw">pub fn </span>expect_right(<span class="self">self</span>, msg: <span class="kw-2">&</span>str) -> R |
| <span class="kw">where |
| </span>L: core::fmt::Debug, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Right(r) => r, |
| Either::Left(l) => <span class="macro">panic!</span>(<span class="string">"{}: {:?}"</span>, msg, l), |
| } |
| } |
| |
| <span class="doccomment">/// Convert the contained value into `T` |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use either::*; |
| /// // Both u16 and u32 can be converted to u64. |
| /// let left: Either<u16, u32> = Left(3u16); |
| /// assert_eq!(left.either_into::<u64>(), 3u64); |
| /// let right: Either<u16, u32> = Right(7u32); |
| /// assert_eq!(right.either_into::<u64>(), 7u64); |
| /// ``` |
| </span><span class="kw">pub fn </span>either_into<T>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>L: Into<T>, |
| R: Into<T>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(l) => l.into(), |
| Either::Right(r) => r.into(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><L, R> Either<<span class="prelude-ty">Option</span><L>, <span class="prelude-ty">Option</span><R>> { |
| <span class="doccomment">/// Factors out `None` from an `Either` of [`Option`]. |
| /// |
| /// ``` |
| /// use either::*; |
| /// let left: Either<_, Option<String>> = Left(Some(vec![0])); |
| /// assert_eq!(left.factor_none(), Some(Left(vec![0]))); |
| /// |
| /// let right: Either<Option<Vec<u8>>, _> = Right(Some(String::new())); |
| /// assert_eq!(right.factor_none(), Some(Right(String::new()))); |
| /// ``` |
| </span><span class="comment">// TODO(MSRV): doc(alias) was stabilized in Rust 1.48 |
| // #[doc(alias = "transpose")] |
| </span><span class="kw">pub fn </span>factor_none(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><Either<L, R>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => l.map(Either::Left), |
| Right(r) => r.map(Either::Right), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><L, R, E> Either<<span class="prelude-ty">Result</span><L, E>, <span class="prelude-ty">Result</span><R, E>> { |
| <span class="doccomment">/// Factors out a homogenous type from an `Either` of [`Result`]. |
| /// |
| /// Here, the homogeneous type is the `Err` type of the [`Result`]. |
| /// |
| /// ``` |
| /// use either::*; |
| /// let left: Either<_, Result<String, u32>> = Left(Ok(vec![0])); |
| /// assert_eq!(left.factor_err(), Ok(Left(vec![0]))); |
| /// |
| /// let right: Either<Result<Vec<u8>, u32>, _> = Right(Ok(String::new())); |
| /// assert_eq!(right.factor_err(), Ok(Right(String::new()))); |
| /// ``` |
| </span><span class="comment">// TODO(MSRV): doc(alias) was stabilized in Rust 1.48 |
| // #[doc(alias = "transpose")] |
| </span><span class="kw">pub fn </span>factor_err(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><Either<L, R>, E> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => l.map(Either::Left), |
| Right(r) => r.map(Either::Right), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, L, R> Either<<span class="prelude-ty">Result</span><T, L>, <span class="prelude-ty">Result</span><T, R>> { |
| <span class="doccomment">/// Factors out a homogenous type from an `Either` of [`Result`]. |
| /// |
| /// Here, the homogeneous type is the `Ok` type of the [`Result`]. |
| /// |
| /// ``` |
| /// use either::*; |
| /// let left: Either<_, Result<u32, String>> = Left(Err(vec![0])); |
| /// assert_eq!(left.factor_ok(), Err(Left(vec![0]))); |
| /// |
| /// let right: Either<Result<u32, Vec<u8>>, _> = Right(Err(String::new())); |
| /// assert_eq!(right.factor_ok(), Err(Right(String::new()))); |
| /// ``` |
| </span><span class="comment">// TODO(MSRV): doc(alias) was stabilized in Rust 1.48 |
| // #[doc(alias = "transpose")] |
| </span><span class="kw">pub fn </span>factor_ok(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><T, Either<L, R>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => l.map_err(Either::Left), |
| Right(r) => r.map_err(Either::Right), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, L, R> Either<(T, L), (T, R)> { |
| <span class="doccomment">/// Factor out a homogeneous type from an either of pairs. |
| /// |
| /// Here, the homogeneous type is the first element of the pairs. |
| /// |
| /// ``` |
| /// use either::*; |
| /// let left: Either<_, (u32, String)> = Left((123, vec![0])); |
| /// assert_eq!(left.factor_first().0, 123); |
| /// |
| /// let right: Either<(u32, Vec<u8>), _> = Right((123, String::new())); |
| /// assert_eq!(right.factor_first().0, 123); |
| /// ``` |
| </span><span class="kw">pub fn </span>factor_first(<span class="self">self</span>) -> (T, Either<L, R>) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left((t, l)) => (t, Left(l)), |
| Right((t, r)) => (t, Right(r)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, L, R> Either<(L, T), (R, T)> { |
| <span class="doccomment">/// Factor out a homogeneous type from an either of pairs. |
| /// |
| /// Here, the homogeneous type is the second element of the pairs. |
| /// |
| /// ``` |
| /// use either::*; |
| /// let left: Either<_, (String, u32)> = Left((vec![0], 123)); |
| /// assert_eq!(left.factor_second().1, 123); |
| /// |
| /// let right: Either<(Vec<u8>, u32), _> = Right((String::new(), 123)); |
| /// assert_eq!(right.factor_second().1, 123); |
| /// ``` |
| </span><span class="kw">pub fn </span>factor_second(<span class="self">self</span>) -> (Either<L, R>, T) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left((l, t)) => (Left(l), t), |
| Right((r, t)) => (Right(r), t), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> Either<T, T> { |
| <span class="doccomment">/// Extract the value of an either over two equivalent types. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let left: Either<_, u32> = Left(123); |
| /// assert_eq!(left.into_inner(), 123); |
| /// |
| /// let right: Either<u32, _> = Right(123); |
| /// assert_eq!(right.into_inner(), 123); |
| /// ``` |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T { |
| <span class="macro">for_both!</span>(<span class="self">self</span>, inner => inner) |
| } |
| |
| <span class="doccomment">/// Map `f` over the contained value and return the result in the |
| /// corresponding variant. |
| /// |
| /// ``` |
| /// use either::*; |
| /// |
| /// let value: Either<_, i32> = Right(42); |
| /// |
| /// let other = value.map(|x| x * 2); |
| /// assert_eq!(other, Right(84)); |
| /// ``` |
| </span><span class="kw">pub fn </span>map<F, M>(<span class="self">self</span>, f: F) -> Either<M, M> |
| <span class="kw">where |
| </span>F: FnOnce(T) -> M, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => Left(f(l)), |
| Right(r) => Right(f(r)), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Convert from `Result` to `Either` with `Ok => Right` and `Err => Left`. |
| </span><span class="kw">impl</span><L, R> From<<span class="prelude-ty">Result</span><R, L>> <span class="kw">for </span>Either<L, R> { |
| <span class="kw">fn </span>from(r: <span class="prelude-ty">Result</span><R, L>) -> <span class="self">Self </span>{ |
| <span class="kw">match </span>r { |
| <span class="prelude-val">Err</span>(e) => Left(e), |
| <span class="prelude-val">Ok</span>(o) => Right(o), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Convert from `Either` to `Result` with `Right => Ok` and `Left => Err`. |
| </span><span class="attribute">#[allow(clippy::from_over_into)] </span><span class="comment">// From requires RFC 2451, Rust 1.41 |
| </span><span class="kw">impl</span><L, R> Into<<span class="prelude-ty">Result</span><R, L>> <span class="kw">for </span>Either<L, R> { |
| <span class="kw">fn </span>into(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><R, L> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(l) => <span class="prelude-val">Err</span>(l), |
| Right(r) => <span class="prelude-val">Ok</span>(r), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><L, R, A> Extend<A> <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: Extend<A>, |
| R: Extend<A>, |
| { |
| <span class="kw">fn </span>extend<T>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: T) |
| <span class="kw">where |
| </span>T: IntoIterator<Item = A>, |
| { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.extend(iter)) |
| } |
| } |
| |
| <span class="doccomment">/// `Either<L, R>` is an iterator if both `L` and `R` are iterators. |
| </span><span class="kw">impl</span><L, R> Iterator <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: Iterator, |
| R: Iterator<Item = L::Item>, |
| { |
| <span class="kw">type </span>Item = L::Item; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.next()) |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.size_hint()) |
| } |
| |
| <span class="kw">fn </span>fold<Acc, G>(<span class="self">self</span>, init: Acc, f: G) -> Acc |
| <span class="kw">where |
| </span>G: FnMut(Acc, <span class="self">Self</span>::Item) -> Acc, |
| { |
| <span class="macro">for_both!</span>(<span class="self">self</span>, inner => inner.fold(init, f)) |
| } |
| |
| <span class="kw">fn </span>for_each<F>(<span class="self">self</span>, f: F) |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Item), |
| { |
| <span class="macro">for_both!</span>(<span class="self">self</span>, inner => inner.for_each(f)) |
| } |
| |
| <span class="kw">fn </span>count(<span class="self">self</span>) -> usize { |
| <span class="macro">for_both!</span>(<span class="self">self</span>, inner => inner.count()) |
| } |
| |
| <span class="kw">fn </span>last(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="macro">for_both!</span>(<span class="self">self</span>, inner => inner.last()) |
| } |
| |
| <span class="kw">fn </span>nth(<span class="kw-2">&mut </span><span class="self">self</span>, n: usize) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.nth(n)) |
| } |
| |
| <span class="kw">fn </span>collect<B>(<span class="self">self</span>) -> B |
| <span class="kw">where |
| </span>B: iter::FromIterator<<span class="self">Self</span>::Item>, |
| { |
| <span class="macro">for_both!</span>(<span class="self">self</span>, inner => inner.collect()) |
| } |
| |
| <span class="kw">fn </span>partition<B, F>(<span class="self">self</span>, f: F) -> (B, B) |
| <span class="kw">where |
| </span>B: Default + Extend<<span class="self">Self</span>::Item>, |
| F: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Item) -> bool, |
| { |
| <span class="macro">for_both!</span>(<span class="self">self</span>, inner => inner.partition(f)) |
| } |
| |
| <span class="kw">fn </span>all<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> bool |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Item) -> bool, |
| { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.all(f)) |
| } |
| |
| <span class="kw">fn </span>any<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> bool |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Item) -> bool, |
| { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.any(f)) |
| } |
| |
| <span class="kw">fn </span>find<P>(<span class="kw-2">&mut </span><span class="self">self</span>, predicate: P) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> |
| <span class="kw">where |
| </span>P: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Item) -> bool, |
| { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.find(predicate)) |
| } |
| |
| <span class="kw">fn </span>find_map<B, F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Option</span><B> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Item) -> <span class="prelude-ty">Option</span><B>, |
| { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.find_map(f)) |
| } |
| |
| <span class="kw">fn </span>position<P>(<span class="kw-2">&mut </span><span class="self">self</span>, predicate: P) -> <span class="prelude-ty">Option</span><usize> |
| <span class="kw">where |
| </span>P: FnMut(<span class="self">Self</span>::Item) -> bool, |
| { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.position(predicate)) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R> DoubleEndedIterator <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: DoubleEndedIterator, |
| R: DoubleEndedIterator<Item = L::Item>, |
| { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.next_back()) |
| } |
| |
| <span class="comment">// TODO(MSRV): This was stabilized in Rust 1.37 |
| // fn nth_back(&mut self, n: usize) -> Option<Self::Item> { |
| // for_both!(*self, ref mut inner => inner.nth_back(n)) |
| // } |
| |
| </span><span class="kw">fn </span>rfold<Acc, G>(<span class="self">self</span>, init: Acc, f: G) -> Acc |
| <span class="kw">where |
| </span>G: FnMut(Acc, <span class="self">Self</span>::Item) -> Acc, |
| { |
| <span class="macro">for_both!</span>(<span class="self">self</span>, inner => inner.rfold(init, f)) |
| } |
| |
| <span class="kw">fn </span>rfind<P>(<span class="kw-2">&mut </span><span class="self">self</span>, predicate: P) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> |
| <span class="kw">where |
| </span>P: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Item) -> bool, |
| { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.rfind(predicate)) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R> ExactSizeIterator <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: ExactSizeIterator, |
| R: ExactSizeIterator<Item = L::Item>, |
| { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.len()) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R> iter::FusedIterator <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: iter::FusedIterator, |
| R: iter::FusedIterator<Item = L::Item>, |
| { |
| } |
| |
| <span class="doccomment">/// `Either<L, R>` is a future if both `L` and `R` are futures. |
| </span><span class="kw">impl</span><L, R> Future <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: Future, |
| R: Future<Output = L::Output>, |
| { |
| <span class="kw">type </span>Output = L::Output; |
| |
| <span class="kw">fn </span>poll( |
| <span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>core::task::Context<<span class="lifetime">'_</span>>, |
| ) -> core::task::Poll<<span class="self">Self</span>::Output> { |
| <span class="macro">for_both!</span>(<span class="self">self</span>.as_pin_mut(), inner => inner.poll(cx)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"use_std"</span>))] |
| </span><span class="doccomment">/// `Either<L, R>` implements `Read` if both `L` and `R` do. |
| /// |
| /// Requires crate feature `"use_std"` |
| </span><span class="kw">impl</span><L, R> Read <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: Read, |
| R: Read, |
| { |
| <span class="kw">fn </span>read(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.read(buf)) |
| } |
| |
| <span class="kw">fn </span>read_exact(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> io::Result<()> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.read_exact(buf)) |
| } |
| |
| <span class="kw">fn </span>read_to_end(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>std::vec::Vec<u8>) -> io::Result<usize> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.read_to_end(buf)) |
| } |
| |
| <span class="kw">fn </span>read_to_string(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>std::string::String) -> io::Result<usize> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.read_to_string(buf)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"use_std"</span>))] |
| </span><span class="doccomment">/// `Either<L, R>` implements `Seek` if both `L` and `R` do. |
| /// |
| /// Requires crate feature `"use_std"` |
| </span><span class="kw">impl</span><L, R> Seek <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: Seek, |
| R: Seek, |
| { |
| <span class="kw">fn </span>seek(<span class="kw-2">&mut </span><span class="self">self</span>, pos: SeekFrom) -> io::Result<u64> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.seek(pos)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"use_std"</span>))] |
| </span><span class="doccomment">/// Requires crate feature `"use_std"` |
| </span><span class="kw">impl</span><L, R> BufRead <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: BufRead, |
| R: BufRead, |
| { |
| <span class="kw">fn </span>fill_buf(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<<span class="kw-2">&</span>[u8]> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.fill_buf()) |
| } |
| |
| <span class="kw">fn </span>consume(<span class="kw-2">&mut </span><span class="self">self</span>, amt: usize) { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.consume(amt)) |
| } |
| |
| <span class="kw">fn </span>read_until(<span class="kw-2">&mut </span><span class="self">self</span>, byte: u8, buf: <span class="kw-2">&mut </span>std::vec::Vec<u8>) -> io::Result<usize> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.read_until(byte, buf)) |
| } |
| |
| <span class="kw">fn </span>read_line(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>std::string::String) -> io::Result<usize> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.read_line(buf)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"use_std"</span>))] |
| </span><span class="doccomment">/// `Either<L, R>` implements `Write` if both `L` and `R` do. |
| /// |
| /// Requires crate feature `"use_std"` |
| </span><span class="kw">impl</span><L, R> Write <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: Write, |
| R: Write, |
| { |
| <span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span>[u8]) -> io::Result<usize> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.write(buf)) |
| } |
| |
| <span class="kw">fn </span>write_all(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span>[u8]) -> io::Result<()> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.write_all(buf)) |
| } |
| |
| <span class="kw">fn </span>write_fmt(<span class="kw-2">&mut </span><span class="self">self</span>, fmt: fmt::Arguments<<span class="lifetime">'_</span>>) -> io::Result<()> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.write_fmt(fmt)) |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.flush()) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R, Target> AsRef<Target> <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: AsRef<Target>, |
| R: AsRef<Target>, |
| { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Target { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.as_ref()) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>impl_specific_ref_and_mut { |
| (<span class="macro-nonterminal">$t</span>:ty, $(<span class="macro-nonterminal">$attr</span>:meta),* ) => { |
| $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)* |
| <span class="kw">impl</span><L, R> AsRef<<span class="macro-nonterminal">$t</span>> <span class="kw">for </span>Either<L, R> |
| <span class="kw">where </span>L: AsRef<<span class="macro-nonterminal">$t</span>>, R: AsRef<<span class="macro-nonterminal">$t</span>> |
| { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="macro-nonterminal">$t </span>{ |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.as_ref()) |
| } |
| } |
| |
| $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)* |
| <span class="kw">impl</span><L, R> AsMut<<span class="macro-nonterminal">$t</span>> <span class="kw">for </span>Either<L, R> |
| <span class="kw">where </span>L: AsMut<<span class="macro-nonterminal">$t</span>>, R: AsMut<<span class="macro-nonterminal">$t</span>> |
| { |
| <span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="macro-nonterminal">$t </span>{ |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.as_mut()) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">impl_specific_ref_and_mut!</span>(str,); |
| <span class="macro">impl_specific_ref_and_mut!</span>( |
| ::std::path::Path, |
| cfg(feature = <span class="string">"use_std"</span>), |
| doc = <span class="string">"Requires crate feature `use_std`." |
| </span>); |
| <span class="macro">impl_specific_ref_and_mut!</span>( |
| ::std::ffi::OsStr, |
| cfg(feature = <span class="string">"use_std"</span>), |
| doc = <span class="string">"Requires crate feature `use_std`." |
| </span>); |
| <span class="macro">impl_specific_ref_and_mut!</span>( |
| ::std::ffi::CStr, |
| cfg(feature = <span class="string">"use_std"</span>), |
| doc = <span class="string">"Requires crate feature `use_std`." |
| </span>); |
| |
| <span class="kw">impl</span><L, R, Target> AsRef<[Target]> <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: AsRef<[Target]>, |
| R: AsRef<[Target]>, |
| { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[Target] { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.as_ref()) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R, Target> AsMut<Target> <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: AsMut<Target>, |
| R: AsMut<Target>, |
| { |
| <span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>Target { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.as_mut()) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R, Target> AsMut<[Target]> <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: AsMut<[Target]>, |
| R: AsMut<[Target]>, |
| { |
| <span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[Target] { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => inner.as_mut()) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R> Deref <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: Deref, |
| R: Deref<Target = L::Target>, |
| { |
| <span class="kw">type </span>Target = L::Target; |
| |
| <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self</span>::Target { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => <span class="kw-2">&**</span>inner) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R> DerefMut <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: DerefMut, |
| R: DerefMut<Target = L::Target>, |
| { |
| <span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self</span>::Target { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref mut </span>inner => <span class="kw-2">&mut *</span>inner) |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"use_std"</span>))] |
| </span><span class="doccomment">/// `Either` implements `Error` if *both* `L` and `R` implement it. |
| </span><span class="kw">impl</span><L, R> Error <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: Error, |
| R: Error, |
| { |
| <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 + <span class="lifetime">'static</span>)> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.source()) |
| } |
| |
| <span class="attribute">#[allow(deprecated)] |
| </span><span class="kw">fn </span>description(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.description()) |
| } |
| |
| <span class="attribute">#[allow(deprecated)] |
| </span><span class="kw">fn </span>cause(<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> { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.cause()) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R> fmt::Display <span class="kw">for </span>Either<L, R> |
| <span class="kw">where |
| </span>L: fmt::Display, |
| R: fmt::Display, |
| { |
| <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<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="macro">for_both!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref </span>inner => inner.fmt(f)) |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>basic() { |
| <span class="kw">let </span><span class="kw-2">mut </span>e = Left(<span class="number">2</span>); |
| <span class="kw">let </span>r = Right(<span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(e, Left(<span class="number">2</span>)); |
| e = r; |
| <span class="macro">assert_eq!</span>(e, Right(<span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(e.left(), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(e.right(), <span class="prelude-val">Some</span>(<span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(e.as_ref().right(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(e.as_mut().right(), <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">2</span>)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>macros() { |
| <span class="kw">use </span>std::string::String; |
| |
| <span class="kw">fn </span>a() -> Either<u32, u32> { |
| <span class="kw">let </span>x: u32 = <span class="macro">try_left!</span>(Right(<span class="number">1337u32</span>)); |
| Left(x * <span class="number">2</span>) |
| } |
| <span class="macro">assert_eq!</span>(a(), Right(<span class="number">1337</span>)); |
| |
| <span class="kw">fn </span>b() -> Either<String, <span class="kw-2">&</span><span class="lifetime">'static </span>str> { |
| Right(<span class="macro">try_right!</span>(Left(<span class="string">"foo bar"</span>))) |
| } |
| <span class="macro">assert_eq!</span>(b(), Left(String::from(<span class="string">"foo bar"</span>))); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>deref() { |
| <span class="kw">use </span>std::string::String; |
| |
| <span class="kw">fn </span>is_str(<span class="kw">_</span>: <span class="kw-2">&</span>str) {} |
| <span class="kw">let </span>value: Either<String, <span class="kw-2">&</span>str> = Left(String::from(<span class="string">"test"</span>)); |
| is_str(<span class="kw-2">&*</span>value); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>iter() { |
| <span class="kw">let </span>x = <span class="number">3</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = <span class="kw">match </span>x { |
| <span class="number">3 </span>=> Left(<span class="number">0</span>..<span class="number">10</span>), |
| <span class="kw">_ </span>=> Right(<span class="number">17</span>..), |
| }; |
| |
| <span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(iter.count(), <span class="number">9</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>seek() { |
| <span class="kw">use </span>std::io; |
| |
| <span class="kw">let </span>use_empty = <span class="bool-val">false</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>mockdata = [<span class="number">0x00</span>; <span class="number">256</span>]; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">256 </span>{ |
| mockdata[i] = i <span class="kw">as </span>u8; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>reader = <span class="kw">if </span>use_empty { |
| <span class="comment">// Empty didn't impl Seek until Rust 1.51 |
| </span>Left(io::Cursor::new([])) |
| } <span class="kw">else </span>{ |
| Right(io::Cursor::new(<span class="kw-2">&</span>mockdata[..])) |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0u8</span>; <span class="number">16</span>]; |
| <span class="macro">assert_eq!</span>(reader.read(<span class="kw-2">&mut </span>buf).unwrap(), buf.len()); |
| <span class="macro">assert_eq!</span>(buf, mockdata[..buf.len()]); |
| |
| <span class="comment">// the first read should advance the cursor and return the next 16 bytes thus the `ne` |
| </span><span class="macro">assert_eq!</span>(reader.read(<span class="kw-2">&mut </span>buf).unwrap(), buf.len()); |
| <span class="macro">assert_ne!</span>(buf, mockdata[..buf.len()]); |
| |
| <span class="comment">// if the seek operation fails it should read 16..31 instead of 0..15 |
| </span>reader.seek(io::SeekFrom::Start(<span class="number">0</span>)).unwrap(); |
| <span class="macro">assert_eq!</span>(reader.read(<span class="kw-2">&mut </span>buf).unwrap(), buf.len()); |
| <span class="macro">assert_eq!</span>(buf, mockdata[..buf.len()]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>read_write() { |
| <span class="kw">use </span>std::io; |
| |
| <span class="kw">let </span>use_stdio = <span class="bool-val">false</span>; |
| <span class="kw">let </span>mockdata = [<span class="number">0xff</span>; <span class="number">256</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>reader = <span class="kw">if </span>use_stdio { |
| Left(io::stdin()) |
| } <span class="kw">else </span>{ |
| Right(<span class="kw-2">&</span>mockdata[..]) |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0u8</span>; <span class="number">16</span>]; |
| <span class="macro">assert_eq!</span>(reader.read(<span class="kw-2">&mut </span>buf).unwrap(), buf.len()); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf, <span class="kw-2">&</span>mockdata[..buf.len()]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>mockbuf = [<span class="number">0u8</span>; <span class="number">256</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = <span class="kw">if </span>use_stdio { |
| Left(io::stdout()) |
| } <span class="kw">else </span>{ |
| Right(<span class="kw-2">&mut </span>mockbuf[..]) |
| }; |
| |
| <span class="kw">let </span>buf = [<span class="number">1u8</span>; <span class="number">16</span>]; |
| <span class="macro">assert_eq!</span>(writer.write(<span class="kw-2">&</span>buf).unwrap(), buf.len()); |
| } |
| |
| <span class="attribute">#[test] |
| #[allow(deprecated)] |
| </span><span class="kw">fn </span>error() { |
| <span class="kw">let </span>invalid_utf8 = <span class="string">b"\xff"</span>; |
| <span class="kw">let </span>res = <span class="kw">if let </span><span class="prelude-val">Err</span>(error) = ::std::str::from_utf8(invalid_utf8) { |
| <span class="prelude-val">Err</span>(Left(error)) |
| } <span class="kw">else if let </span><span class="prelude-val">Err</span>(error) = <span class="string">"x"</span>.parse::<i32>() { |
| <span class="prelude-val">Err</span>(Right(error)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(()) |
| }; |
| <span class="macro">assert!</span>(res.is_err()); |
| res.unwrap_err().description(); <span class="comment">// make sure this can be called |
| </span>} |
| |
| <span class="doccomment">/// A helper macro to check if AsRef and AsMut are implemented for a given type. |
| </span><span class="macro">macro_rules! </span>check_t { |
| (<span class="macro-nonterminal">$t</span>:ty) => {{ |
| <span class="kw">fn </span>check_ref<T: AsRef<<span class="macro-nonterminal">$t</span>>>() {} |
| <span class="kw">fn </span>propagate_ref<T1: AsRef<<span class="macro-nonterminal">$t</span>>, T2: AsRef<<span class="macro-nonterminal">$t</span>>>() { |
| check_ref::<Either<T1, T2>>() |
| } |
| <span class="kw">fn </span>check_mut<T: AsMut<<span class="macro-nonterminal">$t</span>>>() {} |
| <span class="kw">fn </span>propagate_mut<T1: AsMut<<span class="macro-nonterminal">$t</span>>, T2: AsMut<<span class="macro-nonterminal">$t</span>>>() { |
| check_mut::<Either<T1, T2>>() |
| } |
| }}; |
| } |
| |
| <span class="comment">// This "unused" method is here to ensure that compilation doesn't fail on given types. |
| </span><span class="kw">fn </span>_unsized_ref_propagation() { |
| <span class="macro">check_t!</span>(str); |
| |
| <span class="kw">fn </span>check_array_ref<T: AsRef<[Item]>, Item>() {} |
| <span class="kw">fn </span>check_array_mut<T: AsMut<[Item]>, Item>() {} |
| |
| <span class="kw">fn </span>propagate_array_ref<T1: AsRef<[Item]>, T2: AsRef<[Item]>, Item>() { |
| check_array_ref::<Either<T1, T2>, <span class="kw">_</span>>() |
| } |
| |
| <span class="kw">fn </span>propagate_array_mut<T1: AsMut<[Item]>, T2: AsMut<[Item]>, Item>() { |
| check_array_mut::<Either<T1, T2>, <span class="kw">_</span>>() |
| } |
| } |
| |
| <span class="comment">// This "unused" method is here to ensure that compilation doesn't fail on given types. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"use_std"</span>)] |
| </span><span class="kw">fn </span>_unsized_std_propagation() { |
| <span class="macro">check_t!</span>(::std::path::Path); |
| <span class="macro">check_t!</span>(::std::ffi::OsStr); |
| <span class="macro">check_t!</span>(::std::ffi::CStr); |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="either" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |