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  27 <a name="boost_asio.reference.buffer_copy.overload28"></a><a class="link" href="overload28.html" title="buffer_copy (28 of 30 overloads)">buffer_copy
  28         (28 of 30 overloads)</a>
  29 </h4></div></div></div>
  30 <p>
  31           Copies a limited number of bytes from a source buffer to a target buffer
  32           sequence.
  33         </p>
  34 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
  35     <span class="keyword">typename</span> <a class="link" href="../MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">&gt;</span>
  36 <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">buffer_copy</span><span class="special">(</span>
  37     <span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&amp;</span> <span class="identifier">target</span><span class="special">,</span>
  38     <span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&amp;</span> <span class="identifier">source</span><span class="special">,</span>
  39     <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">max_bytes_to_copy</span><span class="special">);</span>
  40 </pre>
  41 <h6>
  42 <a name="boost_asio.reference.buffer_copy.overload28.h0"></a>
  43           <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload28.parameters"></a></span><a class="link" href="overload28.html#boost_asio.reference.buffer_copy.overload28.parameters">Parameters</a>
  44         </h6>
  45 <div class="variablelist">
  46 <p class="title"><b></b></p>
  47 <dl class="variablelist">
  48 <dt><span class="term">target</span></dt>
  49 <dd><p>
  50                 A modifiable buffer sequence representing the memory regions to which
  51                 the bytes will be copied.
  52               </p></dd>
  53 <dt><span class="term">source</span></dt>
  54 <dd><p>
  55                 A modifiable buffer representing the memory region from which the
  56                 bytes will be copied. The contents of the source buffer will not
  57                 be modified.
  58               </p></dd>
  59 <dt><span class="term">max_bytes_to_copy</span></dt>
  60 <dd><p>
  61                 The maximum number of bytes to be copied.
  62               </p></dd>
  63 </dl>
  64 </div>
  65 <h6>
  66 <a name="boost_asio.reference.buffer_copy.overload28.h1"></a>
  67           <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload28.return_value"></a></span><a class="link" href="overload28.html#boost_asio.reference.buffer_copy.overload28.return_value">Return
  68           Value</a>
  69         </h6>
  70 <p>
  71           The number of bytes copied.
  72         </p>
  73 <h6>
  74 <a name="boost_asio.reference.buffer_copy.overload28.h2"></a>
  75           <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload28.remarks"></a></span><a class="link" href="overload28.html#boost_asio.reference.buffer_copy.overload28.remarks">Remarks</a>
  76         </h6>
  77 <p>
  78           The number of bytes copied is the lesser of:
  79         </p>
  80 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  81 <li class="listitem">
  82               <code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">target</span><span class="special">)</span></code>
  83             </li>
  84 <li class="listitem">
  85               <code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">source</span><span class="special">)</span></code>
  86             </li>
  87 <li class="listitem">
  88               <code class="computeroutput"><span class="identifier">max_bytes_to_copy</span></code>
  89             </li>
  90 </ul></div>
  91 <p>
  92           This function is implemented in terms of <code class="computeroutput"><span class="identifier">memcpy</span></code>,
  93           and consequently it cannot be used to copy between overlapping memory regions.
  94         </p>
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  98 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2014 Christopher M. Kohlhoff<p>
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