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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_asio.reference.transfer_at_least"></a><a class="link" href="transfer_at_least.html" title="transfer_at_least">transfer_at_least</a> |
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| <p> |
| <a class="indexterm" name="id1362175"></a> |
| Return a completion condition function object that indicates |
| that a read or write operation should continue until a minimum number of |
| bytes has been transferred, or until an error occurs. |
| </p> |
| <pre class="programlisting"><span class="identifier">unspecified</span> <span class="identifier">transfer_at_least</span><span class="special">(</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">minimum</span><span class="special">);</span> |
| </pre> |
| <p> |
| This function is used to create an object, of unspecified type, that meets |
| CompletionCondition requirements. |
| </p> |
| <a name="boost_asio.reference.transfer_at_least.example"></a><h5> |
| <a name="id1362245"></a> |
| <a class="link" href="transfer_at_least.html#boost_asio.reference.transfer_at_least.example">Example</a> |
| </h5> |
| <p> |
| Reading until a buffer is full or contains at least 64 bytes: |
| </p> |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span><span class="special"><</span><span class="keyword">char</span><span class="special">,</span> <span class="number">128</span><span class="special">></span> <span class="identifier">buf</span><span class="special">;</span> |
| <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="identifier">ec</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</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">read</span><span class="special">(</span> |
| <span class="identifier">sock</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</span><span class="special">(</span><span class="identifier">buf</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">transfer_at_least</span><span class="special">(</span><span class="number">64</span><span class="special">),</span> <span class="identifier">ec</span><span class="special">);</span> |
| <span class="keyword">if</span> <span class="special">(</span><span class="identifier">ec</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="comment">// An error occurred. |
| </span><span class="special">}</span> |
| <span class="keyword">else</span> |
| <span class="special">{</span> |
| <span class="comment">// n >= 64 && n <= 128 |
| </span><span class="special">}</span> |
| </pre> |
| <a name="boost_asio.reference.transfer_at_least.requirements"></a><h5> |
| <a name="id1362556"></a> |
| <a class="link" href="transfer_at_least.html#boost_asio.reference.transfer_at_least.requirements">Requirements</a> |
| </h5> |
| <p> |
| <span class="bold"><strong>Header: </strong></span><code class="literal">boost/asio/completion_condition.hpp</code> |
| </p> |
| <p> |
| <span class="bold"><strong>Convenience header: </strong></span><code class="literal">boost/asio.hpp</code> |
| </p> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 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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