1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>http::opt_token_list</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../index.html" title="Chapter 1. Boost.Beast"> 8<link rel="up" href="../ref.html" title="This Page Intentionally Left Blank 2/2"> 9<link rel="prev" href="boost__beast__http__response_parser.html" title="http::response_parser"> 10<link rel="next" href="boost__beast__http__request_serializer.html" title="http::request_serializer"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="boost__beast__http__response_parser.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../ref.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost__beast__http__request_serializer.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="beast.ref.boost__beast__http__opt_token_list"></a><a class="link" href="boost__beast__http__opt_token_list.html" title="http::opt_token_list">http::opt_token_list</a> 28</h4></div></div></div> 29<p> 30 <a class="indexterm" name="idm46057507939424"></a> 31 </p> 32<p> 33 A list of tokens in a comma separated HTTP field value. 34 </p> 35<h5> 36<a name="beast.ref.boost__beast__http__opt_token_list.h0"></a> 37 <span class="phrase"><a name="beast.ref.boost__beast__http__opt_token_list.synopsis"></a></span><a class="link" href="boost__beast__http__opt_token_list.html#beast.ref.boost__beast__http__opt_token_list.synopsis">Synopsis</a> 38 </h5> 39<p> 40 Defined in header <code class="literal"><<a href="../../../../../../boost/beast/http/rfc7230.hpp" target="_top">boost/beast/http/rfc7230.hpp</a>></code> 41 </p> 42<pre class="programlisting"><span class="keyword">using</span> <span class="identifier">opt_token_list</span> <span class="special">=</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">basic_parsed_list</span><span class="special"><</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">opt_token_list_policy</span> <span class="special">>;</span> 43</pre> 44<h5> 45<a name="beast.ref.boost__beast__http__opt_token_list.h1"></a> 46 <span class="phrase"><a name="beast.ref.boost__beast__http__opt_token_list.description"></a></span><a class="link" href="boost__beast__http__opt_token_list.html#beast.ref.boost__beast__http__opt_token_list.description">Description</a> 47 </h5> 48<p> 49 This container allows iteration of a list of items in a header field value. 50 The input is a comma separated list of tokens. If a parsing error is encountered 51 while iterating the string, the behavior of the container will be as if a 52 string containing only characters up to but excluding the first invalid character 53 was used to construct the list. 54 </p> 55<h5> 56<a name="beast.ref.boost__beast__http__opt_token_list.h2"></a> 57 <span class="phrase"><a name="beast.ref.boost__beast__http__opt_token_list.bnf"></a></span><a class="link" href="boost__beast__http__opt_token_list.html#beast.ref.boost__beast__http__opt_token_list.bnf">BNF</a> 58 </h5> 59<pre class="programlisting"><span class="identifier">token</span><span class="special">-</span><span class="identifier">list</span> <span class="special">=</span> <span class="special">*(</span> <span class="string">","</span> <span class="identifier">OWS</span> <span class="special">)</span> <span class="identifier">token</span> <span class="special">*(</span> <span class="identifier">OWS</span> <span class="string">","</span> <span class="special">[</span> <span class="identifier">OWS</span> <span class="identifier">token</span> <span class="special">]</span> <span class="special">)</span> 60</pre> 61<p> 62 To use this class, construct with the string to be parsed and then use <code class="computeroutput"><span class="identifier">begin</span></code> and <code class="computeroutput"><span class="identifier">end</span></code>, 63 or range-for to iterate each item: 64 </p> 65<h5> 66<a name="beast.ref.boost__beast__http__opt_token_list.h3"></a> 67 <span class="phrase"><a name="beast.ref.boost__beast__http__opt_token_list.example"></a></span><a class="link" href="boost__beast__http__opt_token_list.html#beast.ref.boost__beast__http__opt_token_list.example">Example</a> 68 </h5> 69<pre class="programlisting"><span class="keyword">for</span><span class="special">(</span><span class="keyword">auto</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">token</span> <span class="special">:</span> <span class="identifier">token_list</span><span class="special">{</span><span class="string">"apple, pear, banana"</span><span class="special">})</span> 70 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">token</span> <span class="special"><<</span> <span class="string">"\n"</span><span class="special">;</span> 71</pre> 72</div> 73<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 74<td align="left"></td> 75<td align="right"><div class="copyright-footer">Copyright © 2016-2019 Vinnie 76 Falco<p> 77 Distributed under the Boost Software License, Version 1.0. (See accompanying 78 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>) 79 </p> 80</div></td> 81</tr></table> 82<hr> 83<div class="spirit-nav"> 84<a accesskey="p" href="boost__beast__http__response_parser.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../ref.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost__beast__http__request_serializer.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 85</div> 86</body> 87</html> 88
