<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>execution::mapping_t::is_requirable</title> <link rel="stylesheet" href="../../../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../../index.html" title="Asio"> <link rel="up" href="../execution__mapping_t.html" title="execution::mapping_t"> <link rel="prev" href="is_preferable.html" title="execution::mapping_t::is_preferable"> <link rel="next" href="mapping_t.html" title="execution::mapping_t::mapping_t"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="is_preferable.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../execution__mapping_t.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="mapping_t.html"><img src="../../../next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="asio.reference.execution__mapping_t.is_requirable"></a><a class="link" href="is_requirable.html" title="execution::mapping_t::is_requirable">execution::mapping_t::is_requirable</a> </h4></div></div></div> <p> <a class="indexterm" name="asio.indexterm.execution__mapping_t.is_requirable"></a> The top-level <a class="link" href="../execution__mapping_t.html" title="execution::mapping_t"><code class="computeroutput">execution::mapping_t</code></a> property cannot be required. </p> <pre class="programlisting">static constexpr bool is_requirable = false; </pre> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="is_preferable.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../execution__mapping_t.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="mapping_t.html"><img src="../../../next.png" alt="Next"></a> </div> </body> </html>