82 lines
3.8 KiB
HTML
82 lines
3.8 KiB
HTML
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<title>transfer_at_least</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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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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Return a completion condition
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function object that indicates that a read or write operation should continue
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until a minimum number of bytes has been transferred, or until an error occurs.
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</p>
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<pre class="programlisting">unspecified transfer_at_least(
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std::size_t minimum);
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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">boost::array<char, 128> buf;
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asio::error_code ec;
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std::size_t n = asio::read(
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sock, asio::buffer(buf),
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asio::transfer_at_least(64), ec);
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if (ec)
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{
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// An error occurred.
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}
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else
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{
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// n >= 64 && n <= 128
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}
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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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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
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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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</div></td>
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</tr></table>
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