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