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  27 <a name="beast.ref.boost__beast__basic_multi_buffer.prepare"></a><a class="link" href="prepare.html" title="basic_multi_buffer::prepare">basic_multi_buffer::prepare</a>
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  29 <p>
  30           <a class="indexterm" name="idm45873517624768"></a>
  31 Returns a mutable buffer sequence representing
  32           writable bytes.
  33         </p>
  34 <h6>
  35 <a name="beast.ref.boost__beast__basic_multi_buffer.prepare.h0"></a>
  36           <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.prepare.synopsis"></a></span><a class="link" href="prepare.html#beast.ref.boost__beast__basic_multi_buffer.prepare.synopsis">Synopsis</a>
  37         </h6>
  38 <pre class="programlisting"><span class="identifier">mutable_buffers_type</span>
  39 <span class="identifier">prepare</span><span class="special">(</span>
  40     <span class="identifier">size_type</span> <span class="identifier">n</span><span class="special">);</span>
  41 </pre>
  42 <h6>
  43 <a name="beast.ref.boost__beast__basic_multi_buffer.prepare.h1"></a>
  44           <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.prepare.description"></a></span><a class="link" href="prepare.html#beast.ref.boost__beast__basic_multi_buffer.prepare.description">Description</a>
  45         </h6>
  46 <p>
  47           Returns a mutable buffer sequence representing the writable bytes containing
  48           exactly <code class="computeroutput"><span class="identifier">n</span></code> bytes of storage.
  49           Memory may be reallocated as needed. All buffer sequences previously obtained
  50           using <a class="link" href="prepare.html" title="basic_multi_buffer::prepare"><code class="computeroutput"><span class="identifier">basic_multi_buffer</span><span class="special">::</span><span class="identifier">prepare</span></code></a> are invalidated. Buffer
  51           sequences previously obtained using <a class="link" href="data.html" title="basic_multi_buffer::data"><code class="computeroutput"><span class="identifier">basic_multi_buffer</span><span class="special">::</span><span class="identifier">data</span></code></a> remain valid.
  52         </p>
  53 <h6>
  54 <a name="beast.ref.boost__beast__basic_multi_buffer.prepare.h2"></a>
  55           <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.prepare.parameters"></a></span><a class="link" href="prepare.html#beast.ref.boost__beast__basic_multi_buffer.prepare.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 desired number of bytes in the returned buffer sequence.
  83                   </p>
  84                 </td>
  85 </tr></tbody>
  86 </table></div>
  87 <h6>
  88 <a name="beast.ref.boost__beast__basic_multi_buffer.prepare.h3"></a>
  89           <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.prepare.exceptions"></a></span><a class="link" href="prepare.html#beast.ref.boost__beast__basic_multi_buffer.prepare.exceptions">Exceptions</a>
  90         </h6>
  91 <div class="informaltable"><table class="table">
  92 <colgroup>
  93 <col>
  94 <col>
  95 </colgroup>
  96 <thead><tr>
  97 <th>
  98                   <p>
  99                     Type
 100                   </p>
 101                 </th>
 102 <th>
 103                   <p>
 104                     Thrown On
 105                   </p>
 106                 </th>
 107 </tr></thead>
 108 <tbody><tr>
 109 <td>
 110                   <p>
 111                     <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">length_error</span></code>
 112                   </p>
 113                 </td>
 114 <td>
 115                   <p>
 116                     if <code class="computeroutput"><span class="identifier">size</span><span class="special">()</span>
 117                     <span class="special">+</span> <span class="identifier">n</span></code>
 118                     exceeds <code class="computeroutput"><span class="identifier">max_size</span><span class="special">()</span></code>.
 119                   </p>
 120                 </td>
 121 </tr></tbody>
 122 </table></div>
 123 <h6>
 124 <a name="beast.ref.boost__beast__basic_multi_buffer.prepare.h4"></a>
 125           <span class="phrase"><a name="beast.ref.boost__beast__basic_multi_buffer.prepare.exception_safety"></a></span><a class="link" href="prepare.html#beast.ref.boost__beast__basic_multi_buffer.prepare.exception_safety">Exception
 126           Safety</a>
 127         </h6>
 128 <p>
 129           Strong guarantee.
 130         </p>
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