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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="Create `ServiceFactory` for function that can produce services"><title>fn_factory in actix_service - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-b778ab399e080a4b.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="actix_service" data-themes="" data-resource-suffix="" data-rustdoc-version="1.83.0-nightly (7608018cb 2024-09-29)" data-channel="nightly" data-search-js="search-e056c65ede92db13.js" data-settings-js="settings-805db61a62df4bd2.js" ><script src="../static.files/storage-1d39b6787ed640ff.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-54bc299d2a5e4e43.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-0111fcff984fae8f.css"></noscript><link rel="icon" href="https://actix.rs/favicon.ico"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../actix_service/index.html"><img src="https://actix.rs/img/logo.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../actix_service/index.html"><img src="https://actix.rs/img/logo.png" alt="logo"></a><h2><a href="../actix_service/index.html">actix_<wbr>service</a><span class="version">2.0.2</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">fn_<wbr>factory</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate actix_<wbr>service</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">actix_service</a></span><h1>Function <span class="fn">fn_factory</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/actix_service/fn_service.rs.html#49-56">source</a> </span></div><pre class="rust item-decl"><code>pub fn fn_factory<F, Cfg, Srv, Req, Fut, Err>(
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f: F,
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) -> FnServiceNoConfig<F, Cfg, Srv, Req, Fut, Err><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>() -> Fut,
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Fut: <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Srv, Err>>,
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Srv: <a class="trait" href="trait.Service.html" title="trait actix_service::Service">Service</a><Req>,</div></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Create <code>ServiceFactory</code> for function that can produce services</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::io;
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<span class="kw">use </span>actix_service::{fn_factory, fn_service, Service, ServiceFactory};
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<span class="kw">use </span>futures_util::future::ok;
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<span class="doccomment">/// Service that divides two usize values.
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</span><span class="kw">async fn </span>div((x, y): (usize, usize)) -> <span class="prelude-ty">Result</span><usize, io::Error> {
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<span class="kw">if </span>y == <span class="number">0 </span>{
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<span class="prelude-val">Err</span>(io::Error::new(io::ErrorKind::Other, <span class="string">"divide by zero"</span>))
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} <span class="kw">else </span>{
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<span class="prelude-val">Ok</span>(x / y)
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}
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}
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<span class="attr">#[actix_rt::main]
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</span><span class="kw">async fn </span>main() -> io::Result<()> {
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<span class="comment">// Create service factory that produces `div` services
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</span><span class="kw">let </span>factory = fn_factory(|| {
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ok::<<span class="kw">_</span>, io::Error>(fn_service(div))
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});
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<span class="comment">// construct new service
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</span><span class="kw">let </span>srv = factory.new_service(()).<span class="kw">await</span><span class="question-mark">?</span>;
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<span class="comment">// now we can use `div` service
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</span><span class="kw">let </span>result = srv.call((<span class="number">10</span>, <span class="number">20</span>)).<span class="kw">await</span><span class="question-mark">?</span>;
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<span class="macro">println!</span>(<span class="string">"10 / 20 = {}"</span>, result);
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<span class="prelude-val">Ok</span>(())
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}</code></pre></div>
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</div></details></section></div></main></body></html>
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