81 lines
5.4 KiB
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81 lines
5.4 KiB
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="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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</h3></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.transfer_at_least"></a>
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</p>
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<p>
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Return a completion condition function object that indicates that a read
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or write operation should continue until a minimum number of bytes has been
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transferred, or until an error occurs.
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</p>
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<pre class="programlisting"><span class="identifier">unspecified</span> <span class="identifier">transfer_at_least</span><span class="special">(</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">minimum</span><span class="special">);</span>
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</pre>
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<p>
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This function is used to create an object, of unspecified type, that meets
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CompletionCondition requirements.
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</p>
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<h5>
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<a name="asio.reference.transfer_at_least.h0"></a>
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<span><a name="asio.reference.transfer_at_least.example"></a></span><a class="link" href="transfer_at_least.html#asio.reference.transfer_at_least.example">Example</a>
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</h5>
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<p>
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Reading until a buffer is full or contains at least 64 bytes:
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</p>
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<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>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">;</span>
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<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">asio</span><span class="special">::</span><span class="identifier">read</span><span class="special">(</span>
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<span class="identifier">sock</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>
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<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>
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<span class="keyword">if</span> <span class="special">(</span><span class="identifier">ec</span><span class="special">)</span>
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<span class="special">{</span>
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<span class="comment">// An error occurred.</span>
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<span class="special">}</span>
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<span class="keyword">else</span>
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<span class="special">{</span>
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<span class="comment">// n >= 64 && n <= 128</span>
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<span class="special">}</span>
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</pre>
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<h5>
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<a name="asio.reference.transfer_at_least.h1"></a>
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<span><a name="asio.reference.transfer_at_least.requirements"></a></span><a class="link" href="transfer_at_least.html#asio.reference.transfer_at_least.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">asio/completion_condition.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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