1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>basic_multi_buffer::reserve</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="../boost__beast__basic_multi_buffer.html" title="basic_multi_buffer"> 9<link rel="prev" href="max_size/overload2.html" title="basic_multi_buffer::max_size (2 of 2 overloads)"> 10<link rel="next" href="shrink_to_fit.html" title="basic_multi_buffer::shrink_to_fit"> 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="max_size/overload2.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost__beast__basic_multi_buffer.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="shrink_to_fit.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="beast.ref.boost__beast__basic_multi_buffer.reserve"></a><a class="link" href="reserve.html" title="basic_multi_buffer::reserve">basic_multi_buffer::reserve</a> 28</h5></div></div></div> 29<p> 30 <a class="indexterm" name="idm46057547963024"></a> 31 </p> 32<p> 33 Guarantee a minimum capacity. 34 </p> 35<h6> 36<a name="beast.ref.boost__beast__basic_multi_buffer.reserve.h0"></a> 37 <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.reserve.synopsis"></a></span><a class="link" href="reserve.html#beast.ref.boost__beast__basic_multi_buffer.reserve.synopsis">Synopsis</a> 38 </h6> 39<pre class="programlisting"><span class="keyword">void</span> 40<span class="identifier">reserve</span><span class="special">(</span> 41 <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">);</span> 42</pre> 43<h6> 44<a name="beast.ref.boost__beast__basic_multi_buffer.reserve.h1"></a> 45 <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.reserve.description"></a></span><a class="link" href="reserve.html#beast.ref.boost__beast__basic_multi_buffer.reserve.description">Description</a> 46 </h6> 47<p> 48 This function adjusts the internal storage (if necessary) to guarantee 49 space for at least <code class="computeroutput"><span class="identifier">n</span></code> bytes. 50 Buffer sequences previously obtained using <a class="link" href="data/overload1.html" title="basic_multi_buffer::data (1 of 2 overloads)"><code class="computeroutput"><span class="identifier">data</span></code></a> remain valid, while buffer 51 sequences previously obtained using <a class="link" href="prepare.html" title="basic_multi_buffer::prepare"><code class="computeroutput"><span class="identifier">prepare</span></code></a> become invalid. 52 </p> 53<h6> 54<a name="beast.ref.boost__beast__basic_multi_buffer.reserve.h2"></a> 55 <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.reserve.parameters"></a></span><a class="link" href="reserve.html#beast.ref.boost__beast__basic_multi_buffer.reserve.parameters">Parameters</a> 56 </h6> 57<div class="informaltable"><table class="table"> 58<colgroup> 59<col> 60<col> 61</colgroup> 62<thead><tr> 63<th> 64 <p> 65 Name 66 </p> 67 </th> 68<th> 69 <p> 70 Description 71 </p> 72 </th> 73</tr></thead> 74<tbody><tr> 75<td> 76 <p> 77 <code class="computeroutput"><span class="identifier">n</span></code> 78 </p> 79 </td> 80<td> 81 <p> 82 The minimum number of byte for the new capacity. If this value 83 is greater than the maximum size, then the maximum size will 84 be adjusted upwards to this value. 85 </p> 86 </td> 87</tr></tbody> 88</table></div> 89<h6> 90<a name="beast.ref.boost__beast__basic_multi_buffer.reserve.h3"></a> 91 <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.reserve.exceptions"></a></span><a class="link" href="reserve.html#beast.ref.boost__beast__basic_multi_buffer.reserve.exceptions">Exceptions</a> 92 </h6> 93<div class="informaltable"><table class="table"> 94<colgroup> 95<col> 96<col> 97</colgroup> 98<thead><tr> 99<th> 100 <p> 101 Type 102 </p> 103 </th> 104<th> 105 <p> 106 Thrown On 107 </p> 108 </th> 109</tr></thead> 110<tbody><tr> 111<td> 112 <p> 113 <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">length_error</span></code> 114 </p> 115 </td> 116<td> 117 <p> 118 if n is larger than the maximum allocation size of the allocator. 119 </p> 120 </td> 121</tr></tbody> 122</table></div> 123<h6> 124<a name="beast.ref.boost__beast__basic_multi_buffer.reserve.h4"></a> 125 <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.reserve.exception_safety"></a></span><a class="link" href="reserve.html#beast.ref.boost__beast__basic_multi_buffer.reserve.exception_safety">Exception 126 Safety</a> 127 </h6> 128<p> 129 Strong guarantee. 130 </p> 131</div> 132<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 133<td align="left"></td> 134<td align="right"><div class="copyright-footer">Copyright © 2016-2019 Vinnie 135 Falco<p> 136 Distributed under the Boost Software License, Version 1.0. (See accompanying 137 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>) 138 </p> 139</div></td> 140</tr></table> 141<hr> 142<div class="spirit-nav"> 143<a accesskey="p" href="max_size/overload2.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost__beast__basic_multi_buffer.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="shrink_to_fit.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 144</div> 145</body> 146</html> 147
