1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>empty()</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. Geometry"> 8<link rel="up" href="../boost__geometry__index__rtree.html" title="boost::geometry::index::rtree"> 9<link rel="prev" href="size__.html" title="size()"> 10<link rel="next" href="clear__.html" title="clear()"> 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="size__.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost__geometry__index__rtree.html"><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="clear__.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="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__"></a><a name="classboost_1_1geometry_1_1index_1_1rtree_1a18bed92ff302df192215c3809fe5272e"></a><a class="link" href="empty__.html" title="empty()">empty()</a> 28</h5></div></div></div> 29<p> 30 <a class="indexterm" name="idm45635675342528"></a> 31Query if the container is empty. 32 </p> 33<h6> 34<a name="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.h0"></a> 35 <span class="phrase"><a name="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.synopsis"></a></span><a class="link" href="empty__.html#geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.synopsis">Synopsis</a> 36 </h6> 37<pre class="programlisting"><code class="computeroutput"><span class="keyword">bool</span></code> <code class="computeroutput"><span class="identifier">empty</span></code><code class="computeroutput"><span class="special">()</span></code> 38</pre> 39<h6> 40<a name="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.h1"></a> 41 <span class="phrase"><a name="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.modifier_s_"></a></span><a class="link" href="empty__.html#geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.modifier_s_">Modifier(s)</a> 42 </h6> 43<p> 44</p> 45<pre class="programlisting"><span class="keyword">const</span></pre> 46<p> 47 </p> 48<h6> 49<a name="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.h2"></a> 50 <span class="phrase"><a name="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.returns"></a></span><a class="link" href="empty__.html#geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.returns">Returns</a> 51 </h6> 52<p> 53 true if the container is empty. 54 </p> 55<h6> 56<a name="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.h3"></a> 57 <span class="phrase"><a name="geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.throws"></a></span><a class="link" href="empty__.html#geometry.reference.spatial_indexes.boost__geometry__index__rtree.empty__.throws">Throws</a> 58 </h6> 59<p> 60 Nothing. 61 </p> 62</div> 63<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 64<td align="left"></td> 65<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 66 Wulkiewicz, Oracle and/or its affiliates<p> 67 Distributed under the Boost Software License, Version 1.0. (See accompanying 68 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>) 69 </p> 70</div></td> 71</tr></table> 72<hr> 73<div class="spirit-nav"> 74<a accesskey="p" href="size__.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost__geometry__index__rtree.html"><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="clear__.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 75</div> 76</body> 77</html> 78
