1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>empty(rtree<...> const &)</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="../group__rtree__functions.html" title="R-tree free functions (boost::geometry::index::)"> 9<link rel="prev" href="size_rtree______const___.html" title="size(rtree<...> const &)"> 10<link rel="next" href="bounds_rtree______const___.html" title="bounds(rtree<...> const &)"> 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_rtree______const___.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../group__rtree__functions.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="bounds_rtree______const___.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.group__rtree__functions.empty_rtree______const___"></a><a name="group__rtree__functions_1gaba44e2fb12fdc7b528bfee56a88e0844"></a><a class="link" href="empty_rtree______const___.html" title="empty(rtree<...> const &)">empty(rtree<...> 28 const &)</a> 29</h5></div></div></div> 30<p> 31 <a class="indexterm" name="idm45635673758176"></a> 32Query if there are no values stored in the index. 33 </p> 34<h6> 35<a name="geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.h0"></a> 36 <span class="phrase"><a name="geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.description"></a></span><a class="link" href="empty_rtree______const___.html#geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.description">Description</a> 37 </h6> 38<p> 39 It calls <code class="literal"><a class="link" href="../boost__geometry__index__rtree/empty__.html#classboost_1_1geometry_1_1index_1_1rtree_1a18bed92ff302df192215c3809fe5272e">rtree::empty()</a></code>. 40 </p> 41<h6> 42<a name="geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.h1"></a> 43 <span class="phrase"><a name="geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.synopsis"></a></span><a class="link" href="empty_rtree______const___.html#geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.synopsis">Synopsis</a> 44 </h6> 45<pre class="programlisting"><code class="computeroutput"><span class="keyword">template</span><span class="special"><</span></code><code class="computeroutput"><span class="keyword">typename</span> <span class="identifier">Value</span></code><code class="computeroutput"><span class="special">,</span></code> 46 <code class="computeroutput"><span class="keyword">typename</span> <span class="identifier">Parameters</span></code><code class="computeroutput"><span class="special">,</span></code> 47 <code class="computeroutput"><span class="keyword">typename</span> <span class="identifier">IndexableGetter</span></code><code class="computeroutput"><span class="special">,</span></code> 48 <code class="computeroutput"><span class="keyword">typename</span> <span class="identifier">EqualTo</span></code><code class="computeroutput"><span class="special">,</span></code> 49 <code class="computeroutput"><span class="keyword">typename</span> <span class="identifier">Allocator</span></code><code class="computeroutput"><span class="special">></span></code> 50<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><code class="computeroutput"><span class="identifier">rtree</span><span class="special"><</span> <span class="identifier">Value</span><span class="special">,</span> <span class="identifier">Parameters</span><span class="special">,</span> <span class="identifier">IndexableGetter</span><span class="special">,</span> <span class="identifier">EqualTo</span><span class="special">,</span> <span class="identifier">Allocator</span> <span class="special">></span> <span class="keyword">const</span> <span class="special">&</span></code> <code class="computeroutput"><span class="identifier">tree</span></code><code class="computeroutput"><span class="special">)</span></code> 51</pre> 52<h6> 53<a name="geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.h2"></a> 54 <span class="phrase"><a name="geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.parameter_s_"></a></span><a class="link" href="empty_rtree______const___.html#geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.parameter_s_">Parameter(s)</a> 55 </h6> 56<div class="informaltable"><table class="table"> 57<colgroup> 58<col> 59<col> 60<col> 61</colgroup> 62<thead><tr> 63<th> 64 <p> 65 Type 66 </p> 67 </th> 68<th> 69 <p> 70 Name 71 </p> 72 </th> 73<th> 74 <p> 75 Description 76 </p> 77 </th> 78</tr></thead> 79<tbody><tr> 80<td> 81 <p> 82 <code class="computeroutput"><span class="identifier">rtree</span><span class="special"><</span> 83 <span class="identifier">Value</span><span class="special">,</span> 84 <span class="identifier">Parameters</span><span class="special">,</span> 85 <span class="identifier">IndexableGetter</span><span class="special">,</span> 86 <span class="identifier">EqualTo</span><span class="special">,</span> 87 <span class="identifier">Allocator</span> <span class="special">></span> 88 <span class="keyword">const</span> <span class="special">&</span></code> 89 </p> 90 </td> 91<td> 92 <p> 93 <code class="computeroutput"><span class="identifier">tree</span></code> 94 </p> 95 </td> 96<td> 97 <p> 98 The spatial index. 99 </p> 100 </td> 101</tr></tbody> 102</table></div> 103<h6> 104<a name="geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.h3"></a> 105 <span class="phrase"><a name="geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.returns"></a></span><a class="link" href="empty_rtree______const___.html#geometry.reference.spatial_indexes.group__rtree__functions.empty_rtree______const___.returns">Returns</a> 106 </h6> 107<p> 108 true if there are no values in the index. 109 </p> 110</div> 111<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 112<td align="left"></td> 113<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 114 Wulkiewicz, Oracle and/or its affiliates<p> 115 Distributed under the Boost Software License, Version 1.0. (See accompanying 116 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>) 117 </p> 118</div></td> 119</tr></table> 120<hr> 121<div class="spirit-nav"> 122<a accesskey="p" href="size_rtree______const___.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../group__rtree__functions.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="bounds_rtree______const___.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 123</div> 124</body> 125</html> 126
