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130 lines
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<title>write (4 of 16 overloads)</title>
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<div class="section">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="boost_asio.reference.write.overload4"></a><a class="link" href="overload4.html" title="write (4 of 16 overloads)">write (4 of 16
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overloads)</a>
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</h4></div></div></div>
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<p>
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Write a certain amount of data to a stream before returning.
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</p>
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<pre class="programlisting">template<
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typename <a class="link" href="../SyncWriteStream.html" title="Buffer-oriented synchronous write stream requirements">SyncWriteStream</a>,
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typename <a class="link" href="../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
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typename <a class="link" href="../CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t write(
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SyncWriteStream & s,
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const ConstBufferSequence & buffers,
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CompletionCondition completion_condition,
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boost::system::error_code & ec,
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typename constraint< is_const_buffer_sequence< ConstBufferSequence >::value >::type = 0);
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</pre>
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<p>
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This function is used to write a certain number of bytes of data to a stream.
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The call will block until one of the following conditions is true:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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All of the data in the supplied buffers has been written. That is,
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the bytes transferred is equal to the sum of the buffer sizes.
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</li>
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<li class="listitem">
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The completion_condition function object returns 0.
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</li>
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</ul></div>
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<p>
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This operation is implemented in terms of zero or more calls to the stream's
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write_some function.
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</p>
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<h6>
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<a name="boost_asio.reference.write.overload4.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.write.overload4.parameters"></a></span><a class="link" href="overload4.html#boost_asio.reference.write.overload4.parameters">Parameters</a>
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</h6>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl class="variablelist">
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<dt><span class="term">s</span></dt>
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<dd><p>
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The stream to which the data is to be written. The type must support
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the SyncWriteStream concept.
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</p></dd>
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<dt><span class="term">buffers</span></dt>
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<dd><p>
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One or more buffers containing the data to be written. The sum of
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the buffer sizes indicates the maximum number of bytes to write to
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the stream.
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</p></dd>
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<dt><span class="term">completion_condition</span></dt>
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<dd>
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<p>
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The function object to be called to determine whether the write operation
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is complete. The signature of the function object must be:
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</p>
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<pre class="programlisting">std::size_t completion_condition(
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// Result of latest write_some operation.
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const boost::system::error_code& error,
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// Number of bytes transferred so far.
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std::size_t bytes_transferred
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);
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</pre>
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<p>
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A return value of 0 indicates that the write operation is complete.
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A non-zero return value indicates the maximum number of bytes to
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be written on the next call to the stream's write_some function.
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</p>
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</dd>
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<dt><span class="term">ec</span></dt>
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<dd><p>
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Set to indicate what error occurred, if any.
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</p></dd>
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</dl>
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</div>
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<h6>
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<a name="boost_asio.reference.write.overload4.h1"></a>
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<span class="phrase"><a name="boost_asio.reference.write.overload4.return_value"></a></span><a class="link" href="overload4.html#boost_asio.reference.write.overload4.return_value">Return
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Value</a>
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</h6>
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<p>
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The number of bytes written. If an error occurs, returns the total number
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of bytes successfully transferred prior to the error.
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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 © 2003-2021 Christopher
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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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