transfer_exactly.html
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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.transfer_exactly"></a><a class="link" href="transfer_exactly.html" title="transfer_exactly">transfer_exactly</a>
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<p>
<a class="indexterm" name="asio.indexterm.transfer_exactly"></a>
Return a completion condition
function object that indicates that a read or write operation should continue
until an exact number of bytes has been transferred, or until an error occurs.
</p>
<pre class="programlisting">unspecified transfer_exactly(
std::size_t size);
</pre>
<p>
This function is used to create an object, of unspecified type, that meets
CompletionCondition requirements.
</p>
<h5>
<a name="asio.reference.transfer_exactly.h0"></a>
<span><a name="asio.reference.transfer_exactly.example"></a></span><a class="link" href="transfer_exactly.html#asio.reference.transfer_exactly.example">Example</a>
</h5>
<p>
Reading until a buffer is full or contains exactly 64 bytes:
</p>
<pre class="programlisting">boost::array<char, 128> buf;
asio::error_code ec;
std::size_t n = asio::read(
sock, asio::buffer(buf),
asio::transfer_exactly(64), ec);
if (ec)
{
// An error occurred.
}
else
{
// n == 64
}
</pre>
<h5>
<a name="asio.reference.transfer_exactly.h1"></a>
<span><a name="asio.reference.transfer_exactly.requirements"></a></span><a class="link" href="transfer_exactly.html#asio.reference.transfer_exactly.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/completion_condition.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 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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