2017-07-14 23:24:09 +00:00
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2017-07-14 23:30:16 +00:00
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<meta name="description" content="API documentation for the Rust `quick_main` macro in crate `error_chain`.">
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2017-07-14 23:24:09 +00:00
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2017-07-14 23:30:16 +00:00
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<title>error_chain::quick_main - Rust</title>
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2017-07-14 23:24:09 +00:00
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2017-07-14 23:30:16 +00:00
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<p class='location'><a href='index.html'>error_chain</a></p><script>window.sidebarCurrent = {name: 'quick_main', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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2017-07-14 23:24:09 +00:00
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<section id='main' class="content">
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2017-07-14 23:30:16 +00:00
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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>error_chain</a>::<wbr><a class="macro" href=''>quick_main</a></span><span class='out-of-band'><span id='render-detail'>
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2017-07-14 23:24:09 +00:00
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2017-07-14 23:30:16 +00:00
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</span><a class='srclink' href='../src/error_chain/quick_main.rs.html#42-58' title='goto source code'>[src]</a></span></h1>
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2017-07-14 23:24:09 +00:00
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<pre class="rust macro">
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2017-07-14 23:30:16 +00:00
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">quick_main</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">main</span>:<span class="ident">expr</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Convenient wrapper to be able to use <code>try!</code> and such in the main. You can
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use it with a separated function:</p>
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<pre class="rust rust-example-rendered">
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<span class="macro">quick_main</span><span class="macro">!</span>(<span class="ident">run</span>);
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<span class="kw">fn</span> <span class="ident">run</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="string">"error"</span>.<span class="ident">into</span>())
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}</pre>
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<p>or with a closure:</p>
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<pre class="rust rust-example-rendered">
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<span class="macro">quick_main</span><span class="macro">!</span>(<span class="op">||</span> <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="string">"error"</span>.<span class="ident">into</span>())
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});</pre>
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<p>You can also set the exit value of the process by returning a type that implements <a href="trait.ExitCode.html"><code>ExitCode</code></a>:</p>
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<pre class="rust rust-example-rendered">
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<span class="macro">quick_main</span><span class="macro">!</span>(<span class="ident">run</span>);
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<span class="kw">fn</span> <span class="ident">run</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="string">"error"</span>.<span class="ident">into</span>())
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2017-07-14 23:24:09 +00:00
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}</pre>
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