1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Class template is_recursive_wrapper</title> 6<link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../variant/reference.html#header.boost.variant.recursive_wrapper_hpp" title="Header <boost/variant/recursive_wrapper.hpp>"> 10<link rel="prev" href="recursive_wrapper.html" title="Class template recursive_wrapper"> 11<link rel="next" href="unwrap_recursive_wrapper.html" title="Class template unwrap_recursive_wrapper"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img 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class="refentry"> 27<a name="boost.is_recursive_wrapper"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Class template is_recursive_wrapper</span></h2> 30<p>boost::is_recursive_wrapper — Determines whether the specified type is a specialization of 31 <code class="computeroutput">recursive_wrapper</code>.</p> 32</div> 33<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 34<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../variant/reference.html#header.boost.variant.recursive_wrapper_hpp" title="Header <boost/variant/recursive_wrapper.hpp>">boost/variant/recursive_wrapper.hpp</a>> 35 36</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> 37<span class="keyword">class</span> <a class="link" href="is_recursive_wrapper.html" title="Class template is_recursive_wrapper">is_recursive_wrapper</a> <span class="special">{</span> 38<span class="keyword">public</span><span class="special">:</span> 39 <span class="comment">// types</span> 40 <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.is_recursive_wrapper.type"></a><span class="identifier">type</span><span class="special">;</span> 41 42 <span class="comment">// static constants</span> 43 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">value</span> = <span class="identifier">unspecified</span><span class="special">;</span> 44<span class="special">}</span><span class="special">;</span></pre></div> 45<div class="refsect1"> 46<a name="id-1.3.46.5.7.4.4"></a><h2>Description</h2> 47<p>Value is true iff <code class="computeroutput">T</code> is a specialization of 48 <code class="computeroutput"><a class="link" href="recursive_wrapper.html" title="Class template recursive_wrapper">recursive_wrapper</a></code>.</p> 49<p><span class="bold"><strong>Note</strong></span>: 50 <code class="computeroutput">is_recursive_wrapper</code> is a model of 51 MPL's 52 <span class="emphasis"><em>IntegralConstant</em></span> concept.</p> 53</div> 54</div> 55<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 56<td align="left"></td> 57<td align="right"><div class="copyright-footer">Copyright © 2002, 2003 Eric Friedman, Itay Maman<br>Copyright © 2014-2020 Antony Polukhin<p>Distributed under the Boost Software License, Version 1.0. 58 (See accompanying file <code class="filename">LICENSE_1_0.txt</code> or copy at 59 <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 60 </p> 61</div></td> 62</tr></table> 63<hr> 64<div 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