1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Segment Concept</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="../concepts.html" title="Concepts"> 9<link rel="prev" href="concept_ring.html" title="Ring Concept"> 10<link rel="next" href="../constants.html" title="Constants"> 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="concept_ring.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="../constants.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="geometry.reference.concepts.concept_segment"></a><a class="link" href="concept_segment.html" title="Segment Concept">Segment 28 Concept</a> 29</h4></div></div></div> 30<h6> 31<a name="geometry.reference.concepts.concept_segment.h0"></a> 32 <span class="phrase"><a name="geometry.reference.concepts.concept_segment.description"></a></span><a class="link" href="concept_segment.html#geometry.reference.concepts.concept_segment.description">Description</a> 33 </h6> 34<p> 35 The Segment Concept describes the requirements for a segment type. All 36 algorithms in Boost.Geometry will check any geometry arguments against 37 the concept requirements. 38 </p> 39<h6> 40<a name="geometry.reference.concepts.concept_segment.h1"></a> 41 <span class="phrase"><a name="geometry.reference.concepts.concept_segment.concept_definition"></a></span><a class="link" href="concept_segment.html#geometry.reference.concepts.concept_segment.concept_definition">Concept 42 Definition</a> 43 </h6> 44<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 45<li class="listitem"> 46 there must be a specialization of <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">tag</span></code> 47 defining <code class="computeroutput"><span class="identifier">segment_tag</span></code> 48 as type 49 </li> 50<li class="listitem"> 51 there must be a specialization of <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">point_type</span></code> 52 to define the underlying point type (even if it does not consist of 53 points, it should define this type, to indicate the points it can work 54 with) 55 </li> 56<li class="listitem"> 57 there must be a specialization of <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">indexed_access</span></code>, 58 per index and per dimension, with two functions: 59 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "> 60<li class="listitem"> 61 <code class="computeroutput"><span class="identifier">get</span></code> to get a 62 coordinate value 63 </li> 64<li class="listitem"> 65 <code class="computeroutput"><span class="identifier">set</span></code> to set a 66 coordinate value (this one is not checked for ConstSegment) 67 </li> 68</ul></div> 69 </li> 70</ul></div> 71<div class="note"><table border="0" summary="Note"> 72<tr> 73<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td> 74<th align="left">Note</th> 75</tr> 76<tr><td align="left" valign="top"><p> 77 The segment concept is similar to the box concept, defining using another 78 tag. However, the box concept assumes the index as <code class="computeroutput"><span class="identifier">min_corner</span></code>, 79 <code class="computeroutput"><span class="identifier">max_corner</span></code>, while for 80 the segment concept, there is no assumption. 81 </p></td></tr> 82</table></div> 83<h6> 84<a name="geometry.reference.concepts.concept_segment.h2"></a> 85 <span class="phrase"><a name="geometry.reference.concepts.concept_segment.available_models"></a></span><a class="link" href="concept_segment.html#geometry.reference.concepts.concept_segment.available_models">Available 86 Models</a> 87 </h6> 88<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 89<li class="listitem"> 90 <a class="link" href="../models/model_segment.html" title="model::segment">model::segment</a> 91 </li> 92<li class="listitem"> 93 <a class="link" href="../models/model_referring_segment.html" title="model::referring_segment">referring 94 segment</a> 95 </li> 96</ul></div> 97</div> 98<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 99<td align="left"></td> 100<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 101 Wulkiewicz, Oracle and/or its affiliates<p> 102 Distributed under the Boost Software License, Version 1.0. (See accompanying 103 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>) 104 </p> 105</div></td> 106</tr></table> 107<hr> 108<div class="spirit-nav"> 109<a accesskey="p" href="concept_ring.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="../constants.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 110</div> 111</body> 112</html> 113
