oxipng/doc/clap/macro.simple_enum!.html
2016-03-11 12:13:13 -05:00

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<h1 class='fqn'><span class='in-band'><a href='index.html'>clap</a>::<wbr><a class='macro' href=''>simple_enum!</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'>simple_enum</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>e</span>:<span class='ident'>ident</span> <span class='op'>=&gt;</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>v</span>:<span class='ident'>ident</span>),<span class='op'>+</span>) <span class='op'>=&gt;</span> { ... };
}</pre>
<div class='docblock'><p>Convenience macro generated a simple enum with variants to be used as a type when parsing
arguments. This enum also provides a <code>variants()</code> function which can be used to retrieve a
<code>Vec&lt;&amp;&#39;static str&gt;</code> of the variant names.</p>
<p><strong>NOTE:</strong> This macro automatically implements std::str::FromStr and std::fmt::Display</p>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='macro'>simple_enum</span><span class='macro'>!</span>{<span class='ident'>Foo</span> <span class='op'>=&gt;</span> <span class='ident'>Bar</span>, <span class='ident'>Baz</span>, <span class='ident'>Qux</span>}
<span class='comment'>// Foo enum can now be used via Foo::Bar, or Foo::Baz, etc</span>
<span class='comment'>// and implements std::str::FromStr to use with the value_t! macros</span>
<span class='kw'>fn</span> <span class='ident'>main</span>() {
<span class='kw'>let</span> <span class='ident'>enum_vals</span> <span class='op'>=</span> [<span class='string'>&quot;Bar&quot;</span>, <span class='string'>&quot;Baz&quot;</span>, <span class='string'>&quot;Qux&quot;</span>];
<span class='kw'>let</span> <span class='ident'>m</span> <span class='op'>=</span> <span class='ident'>App</span>::<span class='ident'>new</span>(<span class='string'>&quot;app&quot;</span>)
.<span class='ident'>arg</span>(<span class='ident'>Arg</span>::<span class='ident'>from_usage</span>(<span class='string'>&quot;&lt;foo&gt; &#39;the foo&#39;&quot;</span>)
.<span class='ident'>possible_values</span>(<span class='kw-2'>&amp;</span><span class='ident'>enum_vals</span>))
.<span class='ident'>get_matches</span>();
<span class='kw'>let</span> <span class='ident'>f</span> <span class='op'>=</span> <span class='macro'>value_t_or_exit</span><span class='macro'>!</span>(<span class='ident'>m</span>.<span class='ident'>value_of</span>(<span class='string'>&quot;foo&quot;</span>), <span class='ident'>Foo</span>);
<span class='comment'>// Use f like any other Foo variant...</span>
}</pre>
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