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| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.qi.quick_reference.qi_parsers.operator"></a><a class="link" href="operator.html" title="Parser Operators">Parser |
| Operators</a> |
| </h5></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> |
| <code class="computeroutput"><span class="special">!</span><span class="identifier">a</span></code> |
| </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> |
| <code class="computeroutput"><span class="special">&</span><span class="identifier">a</span></code> |
| </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> |
| <code class="computeroutput"><span class="special">-</span><span class="identifier">a</span></code> |
| </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> |
| <code class="computeroutput"><span class="special">*</span><span class="identifier">a</span></code> |
| </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> |
| <code class="computeroutput"><span class="special">+</span><span class="identifier">a</span></code> |
| </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> |
| <code class="computeroutput"><span class="identifier">a</span> <span class="special">|</span> |
| <span class="identifier">b</span></code> |
| </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> |
| <code class="computeroutput"><span class="identifier">a</span> <span class="special">>></span> |
| <span class="identifier">b</span></code> |
| </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> |
| <code class="computeroutput"><span class="identifier">a</span> <span class="special">></span> |
| <span class="identifier">b</span></code> |
| </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> |
| <code class="computeroutput"><span class="identifier">a</span> <span class="special">-</span> |
| <span class="identifier">b</span></code> |
| </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> |
| <code class="computeroutput"><span class="identifier">a</span> <span class="special">||</span> |
| <span class="identifier">b</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">tuple</span><span class="special"><</span></code> |
| <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">A</span><span class="special">>,</span></code> |
| <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">B</span><span class="special">></span> |
| <span class="special">></span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Sequential Or. Parse <code class="computeroutput"><span class="identifier">a</span></code> |
| or <code class="computeroutput"><span class="identifier">b</span></code> or <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> |
| <code class="computeroutput"><span class="identifier">a</span> <span class="special">%</span> |
| <span class="identifier">b</span></code> |
| </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> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">a</span> <span class="special">^</span> |
| <span class="identifier">b</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">tuple</span><span class="special"><</span></code> |
| <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">A</span><span class="special">>,</span></code> |
| <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">B</span><span class="special">></span> |
| <span class="special">></span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Permutation. Parse <code class="computeroutput"><span class="identifier">a</span></code> |
| or <code class="computeroutput"><span class="identifier">b</span></code> or <code class="computeroutput"><span class="identifier">a</span></code> followed by <code class="computeroutput"><span class="identifier">b</span></code> or <code class="computeroutput"><span class="identifier">b</span></code> |
| followed by <code class="computeroutput"><span class="identifier">a</span></code>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 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>) |
| </p> |
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