1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>read_at</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="../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../reference.html" title="Reference"> 9<link rel="prev" href="read/overload16.html" title="read (16 of 16 overloads)"> 10<link rel="next" href="read_at/overload1.html" title="read_at (1 of 8 overloads)"> 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="read/overload16.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="read_at/overload1.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="boost_asio.reference.read_at"></a><a class="link" href="read_at.html" title="read_at">read_at</a> 28</h3></div></div></div> 29<p> 30 <a class="indexterm" name="boost_asio.indexterm.read_at"></a> 31The <code class="computeroutput">read_at</code> function is a 32 composed operation that reads a certain amount of data at the specified offset 33 before returning. 34 </p> 35<p> 36 Attempt to read a certain amount of data at the specified offset before returning. 37 </p> 38<pre class="programlisting">template< 39 typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>, 40 typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>> 41std::size_t <a class="link" href="read_at/overload1.html" title="read_at (1 of 8 overloads)">read_at</a>( 42 SyncRandomAccessReadDevice & d, 43 uint64_t offset, 44 const MutableBufferSequence & buffers); 45 <span class="emphasis"><em>» <a class="link" href="read_at/overload1.html" title="read_at (1 of 8 overloads)">more...</a></em></span> 46 47template< 48 typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>, 49 typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>> 50std::size_t <a class="link" href="read_at/overload2.html" title="read_at (2 of 8 overloads)">read_at</a>( 51 SyncRandomAccessReadDevice & d, 52 uint64_t offset, 53 const MutableBufferSequence & buffers, 54 boost::system::error_code & ec); 55 <span class="emphasis"><em>» <a class="link" href="read_at/overload2.html" title="read_at (2 of 8 overloads)">more...</a></em></span> 56 57template< 58 typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>, 59 typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>, 60 typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>> 61std::size_t <a class="link" href="read_at/overload3.html" title="read_at (3 of 8 overloads)">read_at</a>( 62 SyncRandomAccessReadDevice & d, 63 uint64_t offset, 64 const MutableBufferSequence & buffers, 65 CompletionCondition completion_condition); 66 <span class="emphasis"><em>» <a class="link" href="read_at/overload3.html" title="read_at (3 of 8 overloads)">more...</a></em></span> 67 68template< 69 typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>, 70 typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>, 71 typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>> 72std::size_t <a class="link" href="read_at/overload4.html" title="read_at (4 of 8 overloads)">read_at</a>( 73 SyncRandomAccessReadDevice & d, 74 uint64_t offset, 75 const MutableBufferSequence & buffers, 76 CompletionCondition completion_condition, 77 boost::system::error_code & ec); 78 <span class="emphasis"><em>» <a class="link" href="read_at/overload4.html" title="read_at (4 of 8 overloads)">more...</a></em></span> 79 80template< 81 typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>, 82 typename Allocator> 83std::size_t <a class="link" href="read_at/overload5.html" title="read_at (5 of 8 overloads)">read_at</a>( 84 SyncRandomAccessReadDevice & d, 85 uint64_t offset, 86 basic_streambuf< Allocator > & b); 87 <span class="emphasis"><em>» <a class="link" href="read_at/overload5.html" title="read_at (5 of 8 overloads)">more...</a></em></span> 88 89template< 90 typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>, 91 typename Allocator> 92std::size_t <a class="link" href="read_at/overload6.html" title="read_at (6 of 8 overloads)">read_at</a>( 93 SyncRandomAccessReadDevice & d, 94 uint64_t offset, 95 basic_streambuf< Allocator > & b, 96 boost::system::error_code & ec); 97 <span class="emphasis"><em>» <a class="link" href="read_at/overload6.html" title="read_at (6 of 8 overloads)">more...</a></em></span> 98 99template< 100 typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>, 101 typename Allocator, 102 typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>> 103std::size_t <a class="link" href="read_at/overload7.html" title="read_at (7 of 8 overloads)">read_at</a>( 104 SyncRandomAccessReadDevice & d, 105 uint64_t offset, 106 basic_streambuf< Allocator > & b, 107 CompletionCondition completion_condition); 108 <span class="emphasis"><em>» <a class="link" href="read_at/overload7.html" title="read_at (7 of 8 overloads)">more...</a></em></span> 109 110template< 111 typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>, 112 typename Allocator, 113 typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>> 114std::size_t <a class="link" href="read_at/overload8.html" title="read_at (8 of 8 overloads)">read_at</a>( 115 SyncRandomAccessReadDevice & d, 116 uint64_t offset, 117 basic_streambuf< Allocator > & b, 118 CompletionCondition completion_condition, 119 boost::system::error_code & ec); 120 <span class="emphasis"><em>» <a class="link" href="read_at/overload8.html" title="read_at (8 of 8 overloads)">more...</a></em></span> 121</pre> 122<h5> 123<a name="boost_asio.reference.read_at.h0"></a> 124 <span class="phrase"><a name="boost_asio.reference.read_at.requirements"></a></span><a class="link" href="read_at.html#boost_asio.reference.read_at.requirements">Requirements</a> 125 </h5> 126<p> 127 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/read_at.hpp</code> 128 </p> 129<p> 130 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code> 131 </p> 132</div> 133<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 134<td align="left"></td> 135<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 136 Kohlhoff<p> 137 Distributed under the Boost Software License, Version 1.0. (See accompanying 138 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>) 139 </p> 140</div></td> 141</tr></table> 142<hr> 143<div class="spirit-nav"> 144<a accesskey="p" href="read/overload16.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="read_at/overload1.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 145</div> 146</body> 147</html> 148
