| 1 | <html> |
|---|
| 2 | <head> |
|---|
| 3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> |
|---|
| 4 | <title>Function template keep</title> |
|---|
| 5 | <link rel="stylesheet" href="../../boostbook.css" type="text/css"> |
|---|
| 6 | <meta name="generator" content="DocBook XSL Stylesheets V1.68.1"> |
|---|
| 7 | <link rel="start" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> |
|---|
| 8 | <link rel="up" href="../../xpressive/reference.html#header.boost.xpressive.regex_primitives.hpp" title="Header <boost/xpressive/regex_primitives.hpp>"> |
|---|
| 9 | <link rel="prev" href="repeat.html" title="Function repeat"> |
|---|
| 10 | <link rel="next" href="before.html" title="Function template before"> |
|---|
| 11 | </head> |
|---|
| 12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> |
|---|
| 13 | <table cellpadding="2" width="100%"> |
|---|
| 14 | <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> |
|---|
| 15 | <td align="center"><a href="../../../../index.htm">Home</a></td> |
|---|
| 16 | <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> |
|---|
| 17 | <td align="center"><a href="../../../../people/people.htm">People</a></td> |
|---|
| 18 | <td align="center"><a href="../../../../more/faq.htm">FAQ</a></td> |
|---|
| 19 | <td align="center"><a href="../../../../more/index.htm">More</a></td> |
|---|
| 20 | </table> |
|---|
| 21 | <hr> |
|---|
| 22 | <div class="spirit-nav"> |
|---|
| 23 | <a accesskey="p" href="repeat.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../../xpressive/reference.html#header.boost.xpressive.regex_primitives.hpp"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="before.html"><img src="../../images/next.png" alt="Next"></a> |
|---|
| 24 | </div> |
|---|
| 25 | <div class="refentry" lang="en"> |
|---|
| 26 | <a name="boost.xpressive.keep"></a><div class="titlepage"></div> |
|---|
| 27 | <div class="refnamediv"> |
|---|
| 28 | <h2><span class="refentrytitle">Function template keep</span></h2> |
|---|
| 29 | <p>boost::xpressive::keep — Create an independent sub-expression. </p> |
|---|
| 30 | </div> |
|---|
| 31 | <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> |
|---|
| 32 | <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"> |
|---|
| 33 | <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Xpr> <span class="type"><span class="emphasis"><em>unspecified</em></span></span> keep(Xpr <span class="bold"><strong>const</strong></span> & xpr);</pre></div> |
|---|
| 34 | <div class="refsect1" lang="en"> |
|---|
| 35 | <a name="id2045895"></a><h2>Description</h2> |
|---|
| 36 | <p>Turn off back-tracking for a sub-expression. Any branches or repeats within the sub-expression will match only one way, and no other alternatives are tried.</p> |
|---|
| 37 | <p> |
|---|
| 38 | |
|---|
| 39 | </p> |
|---|
| 40 | <div class="variablelist"><table border="0"> |
|---|
| 41 | <col align="left" valign="top"> |
|---|
| 42 | <tbody> |
|---|
| 43 | <tr> |
|---|
| 44 | <td> |
|---|
| 45 | <span class="term">Parameters:</span></td> |
|---|
| 46 | <td><div class="variablelist"><table border="0"> |
|---|
| 47 | <col align="left" valign="top"> |
|---|
| 48 | <tbody><tr> |
|---|
| 49 | <td> |
|---|
| 50 | <span class="term"><code class="computeroutput">xpr</code></span></td> |
|---|
| 51 | <td><p>The sub-expression to modify. </p></td> |
|---|
| 52 | </tr></tbody> |
|---|
| 53 | </table></div></td> |
|---|
| 54 | </tr> |
|---|
| 55 | <tr> |
|---|
| 56 | <td> |
|---|
| 57 | <span class="term">Notes:</span></td> |
|---|
| 58 | <td><p>keep(xpr) is equivalent to the perl (?>...) extension.</p></td> |
|---|
| 59 | </tr> |
|---|
| 60 | </tbody> |
|---|
| 61 | </table></div> |
|---|
| 62 | </div> |
|---|
| 63 | </div> |
|---|
| 64 | <table width="100%"><tr> |
|---|
| 65 | <td align="left"></td> |
|---|
| 66 | <td align="right"><small>Copyright © 2003, 2004 Eric Niebler</small></td> |
|---|
| 67 | </tr></table> |
|---|
| 68 | <hr> |
|---|
| 69 | <div class="spirit-nav"> |
|---|
| 70 | <a accesskey="p" href="repeat.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../../xpressive/reference.html#header.boost.xpressive.regex_primitives.hpp"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="before.html"><img src="../../images/next.png" alt="Next"></a> |
|---|
| 71 | </div> |
|---|
| 72 | </body> |
|---|
| 73 | </html> |
|---|
