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<title>Parser Operators</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="spirit_x3.quick_reference.operator"></a><a class="link" href="operator.html" title="Parser Operators">Parser Operators</a>
</h3></div></div></div>
<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">&lt;</span><span class="identifier">A</span><span class="special">&gt;</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">&lt;</span><span class="identifier">A</span><span class="special">&gt;</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">&lt;</span><span class="identifier">A</span><span class="special">&gt;</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">&lt;</span><span class="identifier">A</span><span class="special">,</span>
                  <span class="identifier">B</span><span class="special">&gt;</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">&lt;</span><span class="identifier">A</span><span class="special">,</span>
                  <span class="identifier">B</span><span class="special">&gt;</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">&lt;</span><span class="identifier">A</span><span class="special">,</span>
                  <span class="identifier">B</span><span class="special">&gt;</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">&lt;</span><span class="identifier">A</span><span class="special">&gt;</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>
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<td align="right"><div class="copyright-footer">Copyright &#169; 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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