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<div class="titlepage"><div><div><h5 class="title">
<a name="spirit.karma.quick_reference.primitive_generators.operators"></a><a class="link" href="operators.html" title="Generator Operators">Generator
Operators</a>
</h5></div></div></div>
<p>
See here for more information about <a class="link" href="../../reference/operator.html" title="Operator">Generator
Operators</a>.
</p>
<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>
<a class="link" href="../../reference/operator/not_predicate.html" title="Not-Predicate (!a)"><code class="computeroutput"><span class="special">!</span><span class="identifier">a</span></code></a>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">A</span></code>
</p>
</td>
<td>
<p>
Not predicate. Ensure that <code class="computeroutput"><span class="identifier">a</span></code>
does not succeed generating, but don't create any output
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="../../reference/operator/not_predicate.html" title="Not-Predicate (!a)"><code class="computeroutput"><span class="special">&amp;</span><span class="identifier">a</span></code></a>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">A</span></code>
</p>
</td>
<td>
<p>
And predicate. Ensure that <code class="computeroutput"><span class="identifier">a</span></code>
does succeed generating, but don't create any output
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="../../reference/operator/optional.html" title="Optional (-a)"><code class="computeroutput"><span class="special">-</span><span class="identifier">a</span></code></a>
</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. Generate <code class="computeroutput"><span class="identifier">a</span></code>
zero or one time
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="../../reference/operator/kleene.html" title="Kleene Star (*a)"><code class="computeroutput"><span class="special">*</span><span class="identifier">a</span></code></a>
</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. Generate <code class="computeroutput"><span class="identifier">a</span></code>
zero or more times
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="../../reference/operator/plus.html" title="Plus (+a)"><code class="computeroutput"><span class="special">+</span><span class="identifier">a</span></code></a>
</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. Generate <code class="computeroutput"><span class="identifier">a</span></code>
one or more times
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="../../reference/operator/alternative.html" title="Alternative (a | b)"><code class="computeroutput"><span class="identifier">a</span> <span class="special">|</span>
<span class="identifier">b</span></code></a>
</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. Generate <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>
<a class="link" href="../../reference/operator/sequence.html" title="Sequences (a &lt;&lt; b)"><code class="computeroutput"><span class="identifier">a</span> <span class="special">&lt;&lt;</span>
<span class="identifier">b</span></code></a>
</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. Generate <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>
<a class="link" href="../../reference/operator/list.html" title="Lists (a % b)"><code class="computeroutput"><span class="identifier">a</span> <span class="special">%</span>
<span class="identifier">b</span></code></a>
</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. Generate <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>
<div class="blockquote"><blockquote class="blockquote"><p>
For more information about the attribute propagation rules implemented
by the compound generators please see <a class="link" href="../compound_attribute_rules.html" title="Compound Attribute Rules">Generator
Compound Attribute Rules</a>.
</p></blockquote></div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2001-2010 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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