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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_asio.reference.write_at.overload6"></a><a class="link" href="overload6.html" title="write_at (6 of 8 overloads)">write_at (6
  28         of 8 overloads)</a>
  29 </h4></div></div></div>
  30 <p>
  31           Write all of the supplied data at the specified offset before returning.
  32         </p>
  33 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
  34     <span class="keyword">typename</span> <a class="link" href="../SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</a><span class="special">,</span>
  35     <span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
  36 <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">write_at</span><span class="special">(</span>
  37     <span class="identifier">SyncRandomAccessWriteDevice</span> <span class="special">&amp;</span> <span class="identifier">d</span><span class="special">,</span>
  38     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
  39     <span class="identifier">basic_streambuf</span><span class="special">&lt;</span> <span class="identifier">Allocator</span> <span class="special">&gt;</span> <span class="special">&amp;</span> <span class="identifier">b</span><span class="special">,</span>
  40     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">);</span>
  41 </pre>
  42 <p>
  43           This function is used to write a certain number of bytes of data to a random
  44           access device at a specified offset. The call will block until one of the
  45           following conditions is true:
  46         </p>
  47 <div class="itemizedlist"><ul class="itemizedlist" type="disc">
  48 <li class="listitem">
  49               All of the data in the supplied <a class="link" href="../basic_streambuf.html" title="basic_streambuf"><code class="computeroutput"><span class="identifier">basic_streambuf</span></code></a> has been written.
  50             </li>
  51 <li class="listitem">
  52               An error occurred.
  53             </li>
  54 </ul></div>
  55 <p>
  56           This operation is implemented in terms of zero or more calls to the device's
  57           write_some_at function.
  58         </p>
  59 <h6>
  60 <a name="boost_asio.reference.write_at.overload6.h0"></a>
  61           <span><a name="boost_asio.reference.write_at.overload6.parameters"></a></span><a class="link" href="overload6.html#boost_asio.reference.write_at.overload6.parameters">Parameters</a>
  62         </h6>
  63 <div class="variablelist">
  64 <p class="title"><b></b></p>
  65 <dl>
  66 <dt><span class="term">d</span></dt>
  67 <dd><p>
  68                 The device to which the data is to be written. The type must support
  69                 the SyncRandomAccessWriteDevice concept.
  70               </p></dd>
  71 <dt><span class="term">offset</span></dt>
  72 <dd><p>
  73                 The offset at which the data will be written.
  74               </p></dd>
  75 <dt><span class="term">b</span></dt>
  76 <dd><p>
  77                 The <a class="link" href="../basic_streambuf.html" title="basic_streambuf"><code class="computeroutput"><span class="identifier">basic_streambuf</span></code></a> object from
  78                 which data will be written.
  79               </p></dd>
  80 <dt><span class="term">ec</span></dt>
  81 <dd><p>
  82                 Set to indicate what error occurred, if any.
  83               </p></dd>
  84 </dl>
  85 </div>
  86 <h6>
  87 <a name="boost_asio.reference.write_at.overload6.h1"></a>
  88           <span><a name="boost_asio.reference.write_at.overload6.return_value"></a></span><a class="link" href="overload6.html#boost_asio.reference.write_at.overload6.return_value">Return Value</a>
  89         </h6>
  90 <p>
  91           The number of bytes transferred.
  92         </p>
  93 <h6>
  94 <a name="boost_asio.reference.write_at.overload6.h2"></a>
  95           <span><a name="boost_asio.reference.write_at.overload6.remarks"></a></span><a class="link" href="overload6.html#boost_asio.reference.write_at.overload6.remarks">Remarks</a>
  96         </h6>
  97 <p>
  98           This overload is equivalent to calling:
  99         </p>
 100 <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">write_at</span><span class="special">(</span>
 101     <span class="identifier">d</span><span class="special">,</span> <span class="number">42</span><span class="special">,</span> <span class="identifier">b</span><span class="special">,</span>
 102     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">transfer_all</span><span class="special">(),</span> <span class="identifier">ec</span><span class="special">);</span>
 103 </pre>
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 107 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2012 Christopher M. Kohlhoff<p>
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 109         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>)
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