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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.buffer_copy"></a><a class="link" href="buffer_copy.html" title="buffer_copy">buffer_copy</a>
</h3></div></div></div>
<p>
<a class="indexterm" name="idm45773630972304"></a>
The <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_copy</span></code> function is used to copy bytes
from a source buffer (or buffer sequence) to a target buffer (or buffer sequence).
</p>
<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload1.html" title="buffer_copy (1 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload1.html" title="buffer_copy (1 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload2.html" title="buffer_copy (2 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload2.html" title="buffer_copy (2 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload3.html" title="buffer_copy (3 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload3.html" title="buffer_copy (3 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload4.html" title="buffer_copy (4 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload4.html" title="buffer_copy (4 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload5.html" title="buffer_copy (5 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload5.html" title="buffer_copy (5 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload6.html" title="buffer_copy (6 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload6.html" title="buffer_copy (6 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload7.html" title="buffer_copy (7 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload7.html" title="buffer_copy (7 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload8.html" title="buffer_copy (8 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload8.html" title="buffer_copy (8 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload9.html" title="buffer_copy (9 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload9.html" title="buffer_copy (9 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload10.html" title="buffer_copy (10 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload10.html" title="buffer_copy (10 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload11.html" title="buffer_copy (11 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload11.html" title="buffer_copy (11 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload12.html" title="buffer_copy (12 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload12.html" title="buffer_copy (12 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload13.html" title="buffer_copy (13 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload13.html" title="buffer_copy (13 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload14.html" title="buffer_copy (14 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload14.html" title="buffer_copy (14 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload15.html" title="buffer_copy (15 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload15.html" title="buffer_copy (15 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload16.html" title="buffer_copy (16 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload16.html" title="buffer_copy (16 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload17.html" title="buffer_copy (17 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload17.html" title="buffer_copy (17 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload18.html" title="buffer_copy (18 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload18.html" title="buffer_copy (18 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload19.html" title="buffer_copy (19 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload19.html" title="buffer_copy (19 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload20.html" title="buffer_copy (20 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload20.html" title="buffer_copy (20 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload21.html" title="buffer_copy (21 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload21.html" title="buffer_copy (21 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload22.html" title="buffer_copy (22 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload22.html" title="buffer_copy (22 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload23.html" title="buffer_copy (23 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload23.html" title="buffer_copy (23 of 30 overloads)">more...</a></em></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload24.html" title="buffer_copy (24 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload24.html" title="buffer_copy (24 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload25.html" title="buffer_copy (25 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload25.html" title="buffer_copy (25 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload26.html" title="buffer_copy (26 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload26.html" title="buffer_copy (26 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload27.html" title="buffer_copy (27 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload27.html" title="buffer_copy (27 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload28.html" title="buffer_copy (28 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload28.html" title="buffer_copy (28 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload29.html" title="buffer_copy (29 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">mutable_buffers_1</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload29.html" title="buffer_copy (29 of 30 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="buffer_copy/overload30.html" title="buffer_copy (30 of 30 overloads)">buffer_copy</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload30.html" title="buffer_copy (30 of 30 overloads)">more...</a></em></span>
</pre>
<p>
The <code class="computeroutput"><span class="identifier">buffer_copy</span></code> function
is available in two forms:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
A 2-argument form: <code class="computeroutput"><span class="identifier">buffer_copy</span><span class="special">(</span><span class="identifier">target</span><span class="special">,</span> <span class="identifier">source</span><span class="special">)</span></code>
</li>
<li class="listitem">
A 3-argument form: <code class="computeroutput"><span class="identifier">buffer_copy</span><span class="special">(</span><span class="identifier">target</span><span class="special">,</span> <span class="identifier">source</span><span class="special">,</span> <span class="identifier">max_bytes_to_copy</span><span class="special">)</span></code>
</li>
</ul></div>
<p>
Both forms return the number of bytes actually copied. The number of bytes
copied is the lesser of:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">target</span><span class="special">)</span></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">source</span><span class="special">)</span></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">If</span></code> specified, <code class="computeroutput"><span class="identifier">max_bytes_to_copy</span></code>.
</li>
</ul></div>
<p>
This prevents buffer overflow, regardless of the buffer sizes used in the
copy operation.
</p>
<p>
Note that <a class="link" href="buffer_copy.html" title="buffer_copy"><code class="computeroutput"><span class="identifier">buffer_copy</span></code></a> is implemented in terms
of <code class="computeroutput"><span class="identifier">memcpy</span></code>, and consequently
it cannot be used to copy between overlapping memory regions.
</p>
<h5>
<a name="boost_asio.reference.buffer_copy.h0"></a>
<span class="phrase"><a name="boost_asio.reference.buffer_copy.requirements"></a></span><a class="link" href="buffer_copy.html#boost_asio.reference.buffer_copy.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/buffer.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
</p>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2015 Christopher M.
Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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>)
</p>
</div></td>
</tr></table>
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