1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Function template metadata</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="../../../../index.html" title="Chapter 1. Boost.Histogram"> 8<link rel="up" href="../../../../histogram/reference.html#header.boost.histogram.axis.traits_hpp" title="Header <boost/histogram/axis/traits.hpp>"> 9<link rel="prev" href="is_reducible.html" title="Struct template is_reducible"> 10<link rel="next" href="options.html" title="Function template options"> 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="../../../../../../../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="is_reducible.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../../histogram/reference.html#header.boost.histogram.axis.traits_hpp"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="options.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="refentry"> 26<a name="boost.histogram.axis.traits.metadata"></a><div class="titlepage"></div> 27<div class="refnamediv"> 28<h2><span class="refentrytitle">Function template metadata</span></h2> 29<p>boost::histogram::axis::traits::metadata — Returns reference to metadata of an axis. </p> 30</div> 31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 32<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="../../../../histogram/reference.html#header.boost.histogram.axis.traits_hpp" title="Header <boost/histogram/axis/traits.hpp>">boost/histogram/axis/traits.hpp</a>> 33 34</span> 35<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Axis<span class="special">></span> <span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <span class="identifier">metadata</span><span class="special">(</span><span class="identifier">Axis</span> <span class="special">&&</span> axis<span class="special">)</span><span class="special">;</span></pre></div> 36<div class="refsect1"> 37<a name="idm45113191945920"></a><h2>Description</h2> 38<p>If the expression x.metadata() for an axis instance <code class="computeroutput">x</code> (maybe const) is valid, return the result. Otherwise, return a reference to a static instance of<code class="computeroutput"><a class="link" href="../null_type.html" title="Struct null_type">boost::histogram::axis::null_type</a></code>.</p> 39<p> 40</p> 41<div class="variablelist"><table border="0" class="variablelist compact"> 42<colgroup> 43<col align="left" valign="top"> 44<col> 45</colgroup> 46<tbody><tr> 47<td><p><span class="term">Parameters:</span></p></td> 48<td><div class="variablelist"><table border="0" class="variablelist compact"> 49<colgroup> 50<col align="left" valign="top"> 51<col> 52</colgroup> 53<tbody><tr> 54<td><p><span class="term"><code class="computeroutput">axis</code></span></p></td> 55<td><p>any axis instance </p></td> 56</tr></tbody> 57</table></div></td> 58</tr></tbody> 59</table></div> 60</div> 61</div> 62<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 63<td align="left"></td> 64<td align="right"><div class="copyright-footer">Copyright © 2016-2019 Hans 65 Dembinski<p> 66 Distributed under the Boost Software License, Version 1.0. (See accompanying 67 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 68 </p> 69</div></td> 70</tr></table> 71<hr> 72<div class="spirit-nav"> 73<a accesskey="p" href="is_reducible.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../../histogram/reference.html#header.boost.histogram.axis.traits_hpp"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="options.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 74</div> 75</body> 76</html> 77
