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  27 <a name="boost_asio.reference.buffer_copy.overload22"></a><a class="link" href="overload22.html" title="buffer_copy (22 of 30 overloads)">buffer_copy
  28         (22 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         </p>
  33 <pre class="programlisting"><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>
  34     <span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&amp;</span> <span class="identifier">target</span><span class="special">,</span>
  35     <span class="keyword">const</span> <span class="identifier">const_buffers_1</span> <span class="special">&amp;</span> <span class="identifier">source</span><span class="special">,</span>
  36     <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>
  37 </pre>
  38 <h6>
  39 <a name="boost_asio.reference.buffer_copy.overload22.h0"></a>
  40           <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload22.parameters"></a></span><a class="link" href="overload22.html#boost_asio.reference.buffer_copy.overload22.parameters">Parameters</a>
  41         </h6>
  42 <div class="variablelist">
  43 <p class="title"><b></b></p>
  44 <dl class="variablelist">
  45 <dt><span class="term">target</span></dt>
  46 <dd><p>
  47                 A modifiable buffer representing the memory region to which the bytes
  48                 will be copied.
  49               </p></dd>
  50 <dt><span class="term">source</span></dt>
  51 <dd><p>
  52                 A non-modifiable buffer representing the memory region from which
  53                 the bytes will be copied.
  54               </p></dd>
  55 <dt><span class="term">max_bytes_to_copy</span></dt>
  56 <dd><p>
  57                 The maximum number of bytes to be copied.
  58               </p></dd>
  59 </dl>
  60 </div>
  61 <h6>
  62 <a name="boost_asio.reference.buffer_copy.overload22.h1"></a>
  63           <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload22.return_value"></a></span><a class="link" href="overload22.html#boost_asio.reference.buffer_copy.overload22.return_value">Return
  64           Value</a>
  65         </h6>
  66 <p>
  67           The number of bytes copied.
  68         </p>
  69 <h6>
  70 <a name="boost_asio.reference.buffer_copy.overload22.h2"></a>
  71           <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload22.remarks"></a></span><a class="link" href="overload22.html#boost_asio.reference.buffer_copy.overload22.remarks">Remarks</a>
  72         </h6>
  73 <p>
  74           The number of bytes copied is the lesser of:
  75         </p>
  76 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  77 <li class="listitem">
  78               <code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">target</span><span class="special">)</span></code>
  79             </li>
  80 <li class="listitem">
  81               <code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">source</span><span class="special">)</span></code>
  82             </li>
  83 <li class="listitem">
  84               <code class="computeroutput"><span class="identifier">max_bytes_to_copy</span></code>
  85             </li>
  86 </ul></div>
  87 <p>
  88           This function is implemented in terms of <code class="computeroutput"><span class="identifier">memcpy</span></code>,
  89           and consequently it cannot be used to copy between overlapping memory regions.
  90         </p>
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  94 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2014 Christopher M. Kohlhoff<p>
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