1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>buffer_size</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="buffer_sequence_end/overload4.html" title="buffer_sequence_end (4 of 4 overloads)"> 10<link rel="next" href="buffered_read_stream.html" title="buffered_read_stream"> 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="buffer_sequence_end/overload4.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="buffered_read_stream.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.buffer_size"></a><a class="link" href="buffer_size.html" title="buffer_size">buffer_size</a> 28</h3></div></div></div> 29<p> 30 <a class="indexterm" name="boost_asio.indexterm.buffer_size"></a> 31Get the total number of bytes 32 in a buffer sequence. 33 </p> 34<pre class="programlisting">template< 35 typename BufferSequence> 36std::size_t buffer_size( 37 const BufferSequence & b); 38</pre> 39<p> 40 The <code class="computeroutput">buffer_size</code> function determines the total size of all buffers 41 in the buffer sequence, as if computed as follows: 42 </p> 43<pre class="programlisting">size_t total_size = 0; 44auto i = boost::asio::buffer_sequence_begin(buffers); 45auto end = boost::asio::buffer_sequence_end(buffers); 46for (; i != end; ++i) 47{ 48 const_buffer b(*i); 49 total_size += b.size(); 50} 51return total_size; 52</pre> 53<p> 54 The <code class="computeroutput">BufferSequence</code> template parameter may meet either of the 55 <code class="computeroutput">ConstBufferSequence</code> or <code class="computeroutput">MutableBufferSequence</code> type 56 requirements. 57 </p> 58<h5> 59<a name="boost_asio.reference.buffer_size.h0"></a> 60 <span class="phrase"><a name="boost_asio.reference.buffer_size.requirements"></a></span><a class="link" href="buffer_size.html#boost_asio.reference.buffer_size.requirements">Requirements</a> 61 </h5> 62<p> 63 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/buffer.hpp</code> 64 </p> 65<p> 66 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code> 67 </p> 68</div> 69<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 70<td align="left"></td> 71<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 72 Kohlhoff<p> 73 Distributed under the Boost Software License, Version 1.0. (See accompanying 74 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>) 75 </p> 76</div></td> 77</tr></table> 78<hr> 79<div class="spirit-nav"> 80<a accesskey="p" href="buffer_sequence_end/overload4.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="buffered_read_stream.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 81</div> 82</body> 83</html> 84
