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oxipng/doc/clap/macro.values_t!.html
Joshua Holmer 193e6496bd Version 0.7.0
2016-05-04 10:41:29 -04:00

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<h1 class='fqn'><span class='in-band'><a href='index.html'>clap</a>::<wbr><a class='macro' href=''>values_t!</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust macro'>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>values_t</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>m</span>:<span class='ident'>ident</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>v</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>t</span>:<span class='ident'>ty</span>) <span class='op'>=&gt;</span> { ... };
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>m</span>:<span class='ident'>ident</span>.<span class='ident'>values_of</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>v</span>:<span class='ident'>expr</span>), <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>t</span>:<span class='ident'>ty</span>) <span class='op'>=&gt;</span> { ... };
}</pre>
<div class='docblock'><p>Convenience macro getting a typed value <code>Vec&lt;T&gt;</code> where <code>T</code> implements <code>std::str::FromStr</code> This
macro returns a <code>clap::Result&lt;Vec&lt;T&gt;&gt;</code> (<code>Result&lt;Vec&lt;T&gt;, clap::Error&gt;</code>) which allows you as the
developer to decide what you&#39;d like to do on a failed parse.</p>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>matches</span> <span class='op'>=</span> <span class='ident'>App</span>::<span class='ident'>new</span>(<span class='string'>&quot;myapp&quot;</span>)
.<span class='ident'>arg_from_usage</span>(<span class='string'>&quot;[seq]... &#39;A sequence of pos whole nums, i.e. 20 45&#39;&quot;</span>)
.<span class='ident'>get_matches</span>();
<span class='kw'>let</span> <span class='ident'>vals</span> <span class='op'>=</span> <span class='macro'>values_t</span><span class='macro'>!</span>(<span class='ident'>matches</span>.<span class='ident'>values_of</span>(<span class='string'>&quot;seq&quot;</span>), <span class='ident'>u32</span>).<span class='ident'>unwrap_or_else</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>exit</span>());
<span class='kw'>for</span> <span class='ident'>v</span> <span class='kw'>in</span> <span class='kw-2'>&amp;</span><span class='ident'>vals</span> {
<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;{} + 2: {}&quot;</span>, <span class='ident'>v</span>, <span class='ident'>v</span> <span class='op'>+</span> <span class='number'>2</span>);
}
<span class='kw'>let</span> <span class='ident'>vals</span> <span class='op'>=</span> <span class='macro'>values_t</span><span class='macro'>!</span>(<span class='ident'>matches</span>, <span class='string'>&quot;seq&quot;</span>, <span class='ident'>u32</span>).<span class='ident'>unwrap_or_else</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>exit</span>());
<span class='kw'>for</span> <span class='ident'>v</span> <span class='kw'>in</span> <span class='kw-2'>&amp;</span><span class='ident'>vals</span> {
<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;{} + 2: {}&quot;</span>, <span class='ident'>v</span>, <span class='ident'>v</span> <span class='op'>+</span> <span class='number'>2</span>);
}</pre>
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