1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>basic_system_executor::query (3 of 3 overloads)</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../query.html" title="basic_system_executor::query"> 9<link rel="prev" href="overload2.html" title="basic_system_executor::query (2 of 3 overloads)"> 10<link rel="next" href="../query__static.html" title="basic_system_executor::query"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="overload2.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../query.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../boost_asio.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../query__static.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="boost_asio.reference.basic_system_executor.query.overload3"></a><a class="link" href="overload3.html" title="basic_system_executor::query (3 of 3 overloads)">basic_system_executor::query 28 (3 of 3 overloads)</a> 29</h5></div></div></div> 30<p> 31 Query the occupancy (recommended number of work items) for the system 32 context. 33 </p> 34<pre class="programlisting">std::size_t query( 35 execution::occupancy_t ) const; 36</pre> 37<p> 38 Do not call this function directly. It is intended for use with the 39 <a class="link" href="../../query.html" title="query"><code class="computeroutput">query</code></a> 40 customisation point. 41 </p> 42<p> 43 For example: 44 </p> 45<pre class="programlisting">boost::asio::system_executor ex; 46std::size_t occupancy = boost::asio::query( 47 ex, boost::asio::execution::occupancy); 48</pre> 49</div> 50<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 51<td align="left"></td> 52<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 53 Kohlhoff<p> 54 Distributed under the Boost Software License, Version 1.0. (See accompanying 55 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>) 56 </p> 57</div></td> 58</tr></table> 59<hr> 60<div class="spirit-nav"> 61<a accesskey="p" href="overload2.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../query.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../boost_asio.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../query__static.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 62</div> 63</body> 64</html> 65
