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 <!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/tower-0.4.13/src/util/boxed_clone.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>boxed_clone.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="../../../tower/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="../../../tower/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="kw">use </span><span class="kw">super</span>::ServiceExt;
 <span class="kw">use </span>futures_util::future::BoxFuture;
 <span class="kw">use </span>std::{
     fmt,
     task::{Context, Poll},
 };
 <span class="kw">use </span>tower_layer::{layer_fn, LayerFn};
 <span class="kw">use </span>tower_service::Service;

 <span class="doccomment">/// A [`Clone`] + [`Send`] boxed [`Service`].
 ///
 /// [`BoxCloneService`] turns a service into a trait object, allowing the
 /// response future type to be dynamic, and allowing the service to be cloned.
 ///
 /// This is similar to [`BoxService`](super::BoxService) except the resulting
 /// service implements [`Clone`].
 ///
 /// # Example
 ///
 /// ```
 /// use tower::{Service, ServiceBuilder, BoxError, util::BoxCloneService};
 /// use std::time::Duration;
 /// #
 /// # struct Request;
 /// # struct Response;
 /// # impl Response {
 /// #     fn new() -&gt; Self { Self }
 /// # }
 ///
 /// // This service has a complex type that is hard to name
 /// let service = ServiceBuilder::new()
 ///     .map_request(|req| {
 ///         println!(&quot;received request&quot;);
 ///         req
 ///     })
 ///     .map_response(|res| {
 ///         println!(&quot;response produced&quot;);
 ///         res
 ///     })
 ///     .load_shed()
 ///     .concurrency_limit(64)
 ///     .timeout(Duration::from_secs(10))
 ///     .service_fn(|req: Request| async {
 ///         Ok::&lt;_, BoxError&gt;(Response::new())
 ///     });
 /// # let service = assert_service(service);
 ///
 /// // `BoxCloneService` will erase the type so it&#39;s nameable
 /// let service: BoxCloneService&lt;Request, Response, BoxError&gt; = BoxCloneService::new(service);
 /// # let service = assert_service(service);
 ///
 /// // And we can still clone the service
 /// let cloned_service = service.clone();
 /// #
 /// # fn assert_service&lt;S, R&gt;(svc: S) -&gt; S
 /// # where S: Service&lt;R&gt; { svc }
 /// ```
 </span><span class="kw">pub struct </span>BoxCloneService&lt;T, U, E&gt;(
     Box&lt;
         <span class="kw">dyn </span>CloneService&lt;T, Response = U, Error = E, Future = BoxFuture&lt;<span class="lifetime">&#39;static</span>, <span class="prelude-ty">Result</span>&lt;U, E&gt;&gt;&gt;
             + Send,
     &gt;,
 );

 <span class="kw">impl</span>&lt;T, U, E&gt; BoxCloneService&lt;T, U, E&gt; {
     <span class="doccomment">/// Create a new `BoxCloneService`.
     </span><span class="kw">pub fn </span>new&lt;S&gt;(inner: S) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>S: Service&lt;T, Response = U, Error = E&gt; + Clone + Send + <span class="lifetime">&#39;static</span>,
         S::Future: Send + <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">let </span>inner = inner.map_future(|f| Box::pin(f) <span class="kw">as _</span>);
         BoxCloneService(Box::new(inner))
     }

     <span class="doccomment">/// Returns a [`Layer`] for wrapping a [`Service`] in a [`BoxCloneService`]
     /// middleware.
     ///
     /// [`Layer`]: crate::Layer
     </span><span class="kw">pub fn </span>layer&lt;S&gt;() -&gt; LayerFn&lt;<span class="kw">fn</span>(S) -&gt; <span class="self">Self</span>&gt;
     <span class="kw">where
         </span>S: Service&lt;T, Response = U, Error = E&gt; + Clone + Send + <span class="lifetime">&#39;static</span>,
         S::Future: Send + <span class="lifetime">&#39;static</span>,
     {
         layer_fn(<span class="self">Self</span>::new)
     }
 }

 <span class="kw">impl</span>&lt;T, U, E&gt; Service&lt;T&gt; <span class="kw">for </span>BoxCloneService&lt;T, U, E&gt; {
     <span class="kw">type </span>Response = U;
     <span class="kw">type </span>Error = E;
     <span class="kw">type </span>Future = BoxFuture&lt;<span class="lifetime">&#39;static</span>, <span class="prelude-ty">Result</span>&lt;U, E&gt;&gt;;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>poll_ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;(), E&gt;&gt; {
         <span class="self">self</span>.<span class="number">0</span>.poll_ready(cx)
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>call(<span class="kw-2">&amp;mut </span><span class="self">self</span>, request: T) -&gt; <span class="self">Self</span>::Future {
         <span class="self">self</span>.<span class="number">0</span>.call(request)
     }
 }

 <span class="kw">impl</span>&lt;T, U, E&gt; Clone <span class="kw">for </span>BoxCloneService&lt;T, U, E&gt; {
     <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>(<span class="self">self</span>.<span class="number">0</span>.clone_box())
     }
 }

 <span class="kw">trait </span>CloneService&lt;R&gt;: Service&lt;R&gt; {
     <span class="kw">fn </span>clone_box(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
     ) -&gt; Box&lt;
         <span class="kw">dyn </span>CloneService&lt;R, Response = <span class="self">Self</span>::Response, Error = <span class="self">Self</span>::Error, Future = <span class="self">Self</span>::Future&gt;
             + Send,
     &gt;;
 }

 <span class="kw">impl</span>&lt;R, T&gt; CloneService&lt;R&gt; <span class="kw">for </span>T
 <span class="kw">where
     </span>T: Service&lt;R&gt; + Send + Clone + <span class="lifetime">&#39;static</span>,
 {
     <span class="kw">fn </span>clone_box(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
     ) -&gt; Box&lt;<span class="kw">dyn </span>CloneService&lt;R, Response = T::Response, Error = T::Error, Future = T::Future&gt; + Send&gt;
     {
         Box::new(<span class="self">self</span>.clone())
     }
 }

 <span class="kw">impl</span>&lt;T, U, E&gt; fmt::Debug <span class="kw">for </span>BoxCloneService&lt;T, U, E&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         fmt.debug_struct(<span class="string">&quot;BoxCloneService&quot;</span>).finish()
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tower" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>
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	</pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::ServiceExt;
	<span class="kw">use </span>futures_util::future::BoxFuture;
	<span class="kw">use </span>std::{
	fmt,
	task::{Context, Poll},
	};
	<span class="kw">use </span>tower_layer::{layer_fn, LayerFn};
	<span class="kw">use </span>tower_service::Service;

	<span class="doccomment">/// A [`Clone`] + [`Send`] boxed [`Service`].
	///
	/// [`BoxCloneService`] turns a service into a trait object, allowing the
	/// response future type to be dynamic, and allowing the service to be cloned.
	///
	/// This is similar to [`BoxService`](super::BoxService) except the resulting
	/// service implements [`Clone`].
	///
	/// # Example
	///
	/// ```
	/// use tower::{Service, ServiceBuilder, BoxError, util::BoxCloneService};
	/// use std::time::Duration;
	/// #
	/// # struct Request;
	/// # struct Response;
	/// # impl Response {
	/// # fn new() -> Self { Self }
	/// # }
	///
	/// // This service has a complex type that is hard to name
	/// let service = ServiceBuilder::new()
	/// .map_request(\|req\| {
	/// println!("received request");
	/// req
	/// })
	/// .map_response(\|res\| {
	/// println!("response produced");
	/// res
	/// })
	/// .load_shed()
	/// .concurrency_limit(64)
	/// .timeout(Duration::from_secs(10))
	/// .service_fn(\|req: Request\| async {
	/// Ok::<_, BoxError>(Response::new())
	/// });
	/// # let service = assert_service(service);
	///
	/// // `BoxCloneService` will erase the type so it's nameable
	/// let service: BoxCloneService<Request, Response, BoxError> = BoxCloneService::new(service);
	/// # let service = assert_service(service);
	///
	/// // And we can still clone the service
	/// let cloned_service = service.clone();
	/// #
	/// # fn assert_service<S, R>(svc: S) -> S
	/// # where S: Service<R> { svc }
	/// ```
	</span><span class="kw">pub struct </span>BoxCloneService<T, U, E>(
	Box<
	<span class="kw">dyn </span>CloneService<T, Response = U, Error = E, Future = BoxFuture<<span class="lifetime">'static</span>, <span class="prelude-ty">Result</span><U, E>>>
	+ Send,
	>,
	);

	<span class="kw">impl</span><T, U, E> BoxCloneService<T, U, E> {
	<span class="doccomment">/// Create a new `BoxCloneService`.
	</span><span class="kw">pub fn </span>new<S>(inner: S) -> <span class="self">Self
	</span><span class="kw">where
	</span>S: Service<T, Response = U, Error = E> + Clone + Send + <span class="lifetime">'static</span>,
	S::Future: Send + <span class="lifetime">'static</span>,
	{
	<span class="kw">let </span>inner = inner.map_future(\|f\| Box::pin(f) <span class="kw">as _</span>);
	BoxCloneService(Box::new(inner))
	}

	<span class="doccomment">/// Returns a [`Layer`] for wrapping a [`Service`] in a [`BoxCloneService`]
	/// middleware.
	///
	/// [`Layer`]: crate::Layer
	</span><span class="kw">pub fn </span>layer<S>() -> LayerFn<<span class="kw">fn</span>(S) -> <span class="self">Self</span>>
	<span class="kw">where
	</span>S: Service<T, Response = U, Error = E> + Clone + Send + <span class="lifetime">'static</span>,
	S::Future: Send + <span class="lifetime">'static</span>,
	{
	layer_fn(<span class="self">Self</span>::new)
	}
	}

	<span class="kw">impl</span><T, U, E> Service<T> <span class="kw">for </span>BoxCloneService<T, U, E> {
	<span class="kw">type </span>Response = U;
	<span class="kw">type </span>Error = E;
	<span class="kw">type </span>Future = BoxFuture<<span class="lifetime">'static</span>, <span class="prelude-ty">Result</span><U, E>>;

	<span class="attribute">#[inline]
	</span><span class="kw">fn </span>poll_ready(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), E>> {
	<span class="self">self</span>.<span class="number">0</span>.poll_ready(cx)
	}

	<span class="attribute">#[inline]
	</span><span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, request: T) -> <span class="self">Self</span>::Future {
	<span class="self">self</span>.<span class="number">0</span>.call(request)
	}
	}

	<span class="kw">impl</span><T, U, E> Clone <span class="kw">for </span>BoxCloneService<T, U, E> {
	<span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{
	<span class="self">Self</span>(<span class="self">self</span>.<span class="number">0</span>.clone_box())
	}
	}

	<span class="kw">trait </span>CloneService<R>: Service<R> {
	<span class="kw">fn </span>clone_box(
	<span class="kw-2">&</span><span class="self">self</span>,
	) -> Box<
	<span class="kw">dyn </span>CloneService<R, Response = <span class="self">Self</span>::Response, Error = <span class="self">Self</span>::Error, Future = <span class="self">Self</span>::Future>
	+ Send,
	>;
	}

	<span class="kw">impl</span><R, T> CloneService<R> <span class="kw">for </span>T
	<span class="kw">where
	</span>T: Service<R> + Send + Clone + <span class="lifetime">'static</span>,
	{
	<span class="kw">fn </span>clone_box(
	<span class="kw-2">&</span><span class="self">self</span>,
	) -> Box<<span class="kw">dyn </span>CloneService<R, Response = T::Response, Error = T::Error, Future = T::Future> + Send>
	{
	Box::new(<span class="self">self</span>.clone())
	}
	}

	<span class="kw">impl</span><T, U, E> fmt::Debug <span class="kw">for </span>BoxCloneService<T, U, E> {
	<span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result {
	fmt.debug_struct(<span class="string">"BoxCloneService"</span>).finish()
	}
	}
	</code></pre></div>
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