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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_asio.reference.async_read_until"></a><a class="link" href="async_read_until.html" title="async_read_until">async_read_until</a>
  28 </h3></div></div></div>
  29 <p>
  30         <a class="indexterm" name="boost_asio.indexterm.async_read_until"></a>
  31 The <code class="computeroutput">async_read_until</code>
  32         function is a composed asynchronous operation that reads data into a dynamic
  33         buffer sequence, or into a streambuf, until it contains a delimiter, matches
  34         a regular expression, or a function object indicates a match.
  35       </p>
  36 <p>
  37         Start an asynchronous operation to read data into a dynamic buffer sequence
  38         until it contains a specified delimiter.
  39       </p>
  40 <pre class="programlisting">template&lt;
  41     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
  42     typename <a class="link" href="DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a>,
  43     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
  44 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload1.html" title="async_read_until (1 of 12 overloads)">async_read_until</a>(
  45     AsyncReadStream &amp; s,
  46     DynamicBuffer_v1 &amp;&amp; buffers,
  47     char delim,
  48     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
  49     typename enable_if&lt; is_dynamic_buffer_v1&lt; typename decay&lt; DynamicBuffer_v1 &gt;::type &gt;::value &amp;&amp;!is_dynamic_buffer_v2&lt; typename decay&lt; DynamicBuffer_v1 &gt;::type &gt;::value &gt;::type *  = 0);
  50   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload1.html" title="async_read_until (1 of 12 overloads)">more...</a></em></span>
  51
  52 template&lt;
  53     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
  54     typename <a class="link" href="DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a>,
  55     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
  56 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload2.html" title="async_read_until (2 of 12 overloads)">async_read_until</a>(
  57     AsyncReadStream &amp; s,
  58     DynamicBuffer_v1 &amp;&amp; buffers,
  59     string_view delim,
  60     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
  61     typename enable_if&lt; is_dynamic_buffer_v1&lt; typename decay&lt; DynamicBuffer_v1 &gt;::type &gt;::value &amp;&amp;!is_dynamic_buffer_v2&lt; typename decay&lt; DynamicBuffer_v1 &gt;::type &gt;::value &gt;::type *  = 0);
  62   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload2.html" title="async_read_until (2 of 12 overloads)">more...</a></em></span>
  63 </pre>
  64 <p>
  65         Start an asynchronous operation to read data into a dynamic buffer sequence
  66         until some part of its data matches a regular expression.
  67       </p>
  68 <pre class="programlisting">template&lt;
  69     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
  70     typename <a class="link" href="DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a>,
  71     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
  72 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload3.html" title="async_read_until (3 of 12 overloads)">async_read_until</a>(
  73     AsyncReadStream &amp; s,
  74     DynamicBuffer_v1 &amp;&amp; buffers,
  75     const boost::regex &amp; expr,
  76     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
  77     typename enable_if&lt; is_dynamic_buffer_v1&lt; typename decay&lt; DynamicBuffer_v1 &gt;::type &gt;::value &amp;&amp;!is_dynamic_buffer_v2&lt; typename decay&lt; DynamicBuffer_v1 &gt;::type &gt;::value &gt;::type *  = 0);
  78   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload3.html" title="async_read_until (3 of 12 overloads)">more...</a></em></span>
  79 </pre>
  80 <p>
  81         Start an asynchronous operation to read data into a dynamic buffer sequence
  82         until a function object indicates a match.
  83       </p>
  84 <pre class="programlisting">template&lt;
  85     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
  86     typename <a class="link" href="DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a>,
  87     typename MatchCondition,
  88     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
  89 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload4.html" title="async_read_until (4 of 12 overloads)">async_read_until</a>(
  90     AsyncReadStream &amp; s,
  91     DynamicBuffer_v1 &amp;&amp; buffers,
  92     MatchCondition match_condition,
  93     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
  94     typename enable_if&lt; is_match_condition&lt; MatchCondition &gt;::value &amp;&amp;is_dynamic_buffer_v1&lt; typename decay&lt; DynamicBuffer_v1 &gt;::type &gt;::value &amp;&amp;!is_dynamic_buffer_v2&lt; typename decay&lt; DynamicBuffer_v1 &gt;::type &gt;::value &gt;::type *  = 0);
  95   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload4.html" title="async_read_until (4 of 12 overloads)">more...</a></em></span>
  96 </pre>
  97 <p>
  98         Start an asynchronous operation to read data into a streambuf until it contains
  99         a specified delimiter.
 100       </p>
 101 <pre class="programlisting">template&lt;
 102     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
 103     typename Allocator,
 104     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
 105 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload5.html" title="async_read_until (5 of 12 overloads)">async_read_until</a>(
 106     AsyncReadStream &amp; s,
 107     boost::asio::basic_streambuf&lt; Allocator &gt; &amp; b,
 108     char delim,
 109     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>);
 110   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload5.html" title="async_read_until (5 of 12 overloads)">more...</a></em></span>
 111
 112 template&lt;
 113     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
 114     typename Allocator,
 115     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
 116 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload6.html" title="async_read_until (6 of 12 overloads)">async_read_until</a>(
 117     AsyncReadStream &amp; s,
 118     boost::asio::basic_streambuf&lt; Allocator &gt; &amp; b,
 119     string_view delim,
 120     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>);
 121   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload6.html" title="async_read_until (6 of 12 overloads)">more...</a></em></span>
 122 </pre>
 123 <p>
 124         Start an asynchronous operation to read data into a streambuf until some
 125         part of its data matches a regular expression.
 126       </p>
 127 <pre class="programlisting">template&lt;
 128     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
 129     typename Allocator,
 130     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
 131 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload7.html" title="async_read_until (7 of 12 overloads)">async_read_until</a>(
 132     AsyncReadStream &amp; s,
 133     boost::asio::basic_streambuf&lt; Allocator &gt; &amp; b,
 134     const boost::regex &amp; expr,
 135     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>);
 136   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload7.html" title="async_read_until (7 of 12 overloads)">more...</a></em></span>
 137 </pre>
 138 <p>
 139         Start an asynchronous operation to read data into a streambuf until a function
 140         object indicates a match.
 141       </p>
 142 <pre class="programlisting">template&lt;
 143     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
 144     typename Allocator,
 145     typename MatchCondition,
 146     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
 147 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload8.html" title="async_read_until (8 of 12 overloads)">async_read_until</a>(
 148     AsyncReadStream &amp; s,
 149     boost::asio::basic_streambuf&lt; Allocator &gt; &amp; b,
 150     MatchCondition match_condition,
 151     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
 152     typename enable_if&lt; is_match_condition&lt; MatchCondition &gt;::value &gt;::type *  = 0);
 153   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload8.html" title="async_read_until (8 of 12 overloads)">more...</a></em></span>
 154 </pre>
 155 <p>
 156         Start an asynchronous operation to read data into a dynamic buffer sequence
 157         until it contains a specified delimiter.
 158       </p>
 159 <pre class="programlisting">template&lt;
 160     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
 161     typename <a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>,
 162     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
 163 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload9.html" title="async_read_until (9 of 12 overloads)">async_read_until</a>(
 164     AsyncReadStream &amp; s,
 165     DynamicBuffer_v2 buffers,
 166     char delim,
 167     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
 168     typename enable_if&lt; is_dynamic_buffer_v2&lt; DynamicBuffer_v2 &gt;::value &gt;::type *  = 0);
 169   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload9.html" title="async_read_until (9 of 12 overloads)">more...</a></em></span>
 170
 171 template&lt;
 172     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
 173     typename <a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>,
 174     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
 175 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload10.html" title="async_read_until (10 of 12 overloads)">async_read_until</a>(
 176     AsyncReadStream &amp; s,
 177     DynamicBuffer_v2 buffers,
 178     string_view delim,
 179     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
 180     typename enable_if&lt; is_dynamic_buffer_v2&lt; DynamicBuffer_v2 &gt;::value &gt;::type *  = 0);
 181   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload10.html" title="async_read_until (10 of 12 overloads)">more...</a></em></span>
 182 </pre>
 183 <p>
 184         Start an asynchronous operation to read data into a dynamic buffer sequence
 185         until some part of its data matches a regular expression.
 186       </p>
 187 <pre class="programlisting">template&lt;
 188     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
 189     typename <a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>,
 190     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
 191 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload11.html" title="async_read_until (11 of 12 overloads)">async_read_until</a>(
 192     AsyncReadStream &amp; s,
 193     DynamicBuffer_v2 buffers,
 194     const boost::regex &amp; expr,
 195     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
 196     typename enable_if&lt; is_dynamic_buffer_v2&lt; DynamicBuffer_v2 &gt;::value &gt;::type *  = 0);
 197   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload11.html" title="async_read_until (11 of 12 overloads)">more...</a></em></span>
 198 </pre>
 199 <p>
 200         Start an asynchronous operation to read data into a dynamic buffer sequence
 201         until a function object indicates a match.
 202       </p>
 203 <pre class="programlisting">template&lt;
 204     typename <a class="link" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
 205     typename <a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>,
 206     typename MatchCondition,
 207     typename <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a> = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
 208 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_read_until/overload12.html" title="async_read_until (12 of 12 overloads)">async_read_until</a>(
 209     AsyncReadStream &amp; s,
 210     DynamicBuffer_v2 buffers,
 211     MatchCondition match_condition,
 212     ReadHandler &amp;&amp; handler = <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
 213     typename enable_if&lt; is_match_condition&lt; MatchCondition &gt;::value &amp;&amp;is_dynamic_buffer_v2&lt; DynamicBuffer_v2 &gt;::value &gt;::type *  = 0);
 214   <span class="emphasis"><em>&#187; <a class="link" href="async_read_until/overload12.html" title="async_read_until (12 of 12 overloads)">more...</a></em></span>
 215 </pre>
 216 <h5>
 217 <a name="boost_asio.reference.async_read_until.h0"></a>
 218         <span class="phrase"><a name="boost_asio.reference.async_read_until.requirements"></a></span><a class="link" href="async_read_until.html#boost_asio.reference.async_read_until.requirements">Requirements</a>
 219       </h5>
 220 <p>
 221         <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/read_until.hpp</code>
 222       </p>
 223 <p>
 224         <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
 225       </p>
 226 </div>
 227 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 228 <td align="left"></td>
 229 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2019 Christopher M. Kohlhoff<p>
 230         Distributed under the Boost Software License, Version 1.0. (See accompanying
 231         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>)
 232       </p>
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