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- <a name="spirit_x3.quick_reference.operator"></a><a class="link" href="operator.html" title="Parser Operators">Parser Operators</a>
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- <div class="informaltable"><table class="table">
- <colgroup>
- <col>
- <col>
- <col>
- </colgroup>
- <thead><tr>
- <th>
- <p>
- Expression
- </p>
- </th>
- <th>
- <p>
- Attribute
- </p>
- </th>
- <th>
- <p>
- Description
- </p>
- </th>
- </tr></thead>
- <tbody>
- <tr>
- <td>
- <p>
- Not Predicate
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">Unused</span></code>
- </p>
- </td>
- <td>
- <p>
- Not predicate. If the predicate <code class="computeroutput"><span class="identifier">a</span></code>
- matches, fail. Otherwise, return a zero length match.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- And Predicate
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">Unused</span></code>
- </p>
- </td>
- <td>
- <p>
- And predicate. If the predicate <code class="computeroutput"><span class="identifier">a</span></code>
- matches, return a zero length match. Otherwise, fail.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- Optional
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- Optional. Parse <code class="computeroutput"><span class="identifier">a</span></code>
- zero or one time
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- Kleene
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- Kleene. Parse <code class="computeroutput"><span class="identifier">a</span></code>
- zero or more times
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- Plus
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- Plus. Parse <code class="computeroutput"><span class="identifier">a</span></code> one
- or more times
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- Alternative
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">variant</span><span class="special"><</span><span class="identifier">A</span><span class="special">,</span>
- <span class="identifier">B</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- Alternative. Parse <code class="computeroutput"><span class="identifier">a</span></code>
- or <code class="computeroutput"><span class="identifier">b</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- Sequence
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">tuple</span><span class="special"><</span><span class="identifier">A</span><span class="special">,</span>
- <span class="identifier">B</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- Sequence. Parse <code class="computeroutput"><span class="identifier">a</span></code>
- followed by <code class="computeroutput"><span class="identifier">b</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- Expectation operator
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">tuple</span><span class="special"><</span><span class="identifier">A</span><span class="special">,</span>
- <span class="identifier">B</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- Expect. Parse <code class="computeroutput"><span class="identifier">a</span></code>
- followed by <code class="computeroutput"><span class="identifier">b</span></code>.
- <code class="computeroutput"><span class="identifier">b</span></code> is expected to
- match when <code class="computeroutput"><span class="identifier">a</span></code> matches,
- otherwise, an <code class="computeroutput"><span class="identifier">expectation_failure</span></code>
- is thrown.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- Difference
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">A</span></code>
- </p>
- </td>
- <td>
- <p>
- Difference. Parse <code class="computeroutput"><span class="identifier">a</span></code>
- but not <code class="computeroutput"><span class="identifier">b</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- List
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- List. Parse <code class="computeroutput"><span class="identifier">a</span></code> delimited
- <code class="computeroutput"><span class="identifier">b</span></code> one or more times
- </p>
- </td>
- </tr>
- </tbody>
- </table></div>
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- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2001-2018 Joel de Guzman,
- Hartmut Kaiser<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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