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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_asio.reference.buffer_cast"></a><a class="link" href="buffer_cast.html" title="buffer_cast">buffer_cast</a> |
| </h3></div></div></div> |
| <p> |
| <a class="indexterm" name="id1271029"></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_cast</span></code> function is used to obtain |
| a pointer to the underlying memory region associated with a buffer. |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> |
| <span class="keyword">typename</span> <span class="identifier">PointerToPodType</span><span class="special">></span> |
| <span class="identifier">PointerToPodType</span> <a class="link" href="buffer_cast/overload1.html" title="buffer_cast (1 of 2 overloads)">buffer_cast</a><span class="special">(</span> |
| <span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">b</span><span class="special">);</span> |
| <span class="emphasis"><em>» <a class="link" href="buffer_cast/overload1.html" title="buffer_cast (1 of 2 overloads)">more...</a></em></span> |
| |
| <span class="keyword">template</span><span class="special"><</span> |
| <span class="keyword">typename</span> <span class="identifier">PointerToPodType</span><span class="special">></span> |
| <span class="identifier">PointerToPodType</span> <a class="link" href="buffer_cast/overload2.html" title="buffer_cast (2 of 2 overloads)">buffer_cast</a><span class="special">(</span> |
| <span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">&</span> <span class="identifier">b</span><span class="special">);</span> |
| <span class="emphasis"><em>» <a class="link" href="buffer_cast/overload2.html" title="buffer_cast (2 of 2 overloads)">more...</a></em></span> |
| </pre> |
| <a name="boost_asio.reference.buffer_cast.examples_"></a><h5> |
| <a name="boost_asio.reference.buffer_cast.examples_-heading"></a> |
| <a class="link" href="buffer_cast.html#boost_asio.reference.buffer_cast.examples_">Examples:</a> |
| </h5> |
| <p> |
| To access the memory of a non-modifiable buffer, use: |
| </p> |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">const_buffer</span> <span class="identifier">b1</span> <span class="special">=</span> <span class="special">...;</span> |
| <span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">p1</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*>(</span><span class="identifier">b1</span><span class="special">);</span> |
| </pre> |
| <p> |
| To access the memory of a modifiable buffer, use: |
| </p> |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">mutable_buffer</span> <span class="identifier">b2</span> <span class="special">=</span> <span class="special">...;</span> |
| <span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">p2</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*>(</span><span class="identifier">b2</span><span class="special">);</span> |
| </pre> |
| <p> |
| 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_cast</span></code> function permits violations |
| of type safety, so uses of it in application code should be carefully considered. |
| </p> |
| <a name="boost_asio.reference.buffer_cast.requirements"></a><h5> |
| <a name="boost_asio.reference.buffer_cast.requirements-heading"></a> |
| <a class="link" href="buffer_cast.html#boost_asio.reference.buffer_cast.requirements">Requirements</a> |
| </h5> |
| <p> |
| <span class="bold"><strong>Header: </strong></span><code class="literal">boost/asio/buffer.hpp</code> |
| </p> |
| <p> |
| <span class="bold"><strong>Convenience header: </strong></span><code class="literal">boost/asio.hpp</code> |
| </p> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003-2011 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>) |
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