1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 3<title>decltype(auto) try_operation_extract_value(X) - Boost.Outcome documentation</title> 4<link rel="stylesheet" href="../../css/boost.css" type="text/css"> 5<meta name="generator" content="Hugo 0.52 with Boostdoc theme"> 6<meta name="viewport" content="width=device-width,initial-scale=1.0"/> 7 8<link rel="icon" href="../../images/favicon.ico" type="image/ico"/> 9<body><div class="spirit-nav"> 10<a accesskey="p" href="../../reference/functions/try_operation_has_value.html"><img src="../../images/prev.png" alt="Prev"></a> 11 <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a> 12 <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/try_operation_return_as.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content"> 13 <div class="titlepage"><div><div><h1 style="clear: both"><code>decltype(auto) try_operation_extract_value(X)</code></h1></div></div></div> 14 <p>This default implementation returns whatever the <code>.assume_value()</code> or <code>.value()</code> member functions return, preferentially choosing the former where both are available.</p> 15 16<p><em>Requires</em>: That the expression <code>std::declval<T>().assume_value()</code> and/or <code>std::declval<T>().value()</code> is a valid expression.</p> 17 18<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p> 19 20<p><em>Header</em>: <code><boost/outcome/try.hpp></code></p> 21 22 23 </div><p><small>Last revised: June 20, 2019 at 11:14:48 +0100</small></p> 24<hr> 25<div class="spirit-nav"> 26<a accesskey="p" href="../../reference/functions/try_operation_has_value.html"><img src="../../images/prev.png" alt="Prev"></a> 27 <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a> 28 <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/try_operation_return_as.html"><img src="../../images/next.png" alt="Next"></a></div></body> 29</html> 30