1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>C array</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="../adapted.html" title="Adapted models"> 9<link rel="prev" href="../adapted.html" title="Adapted models"> 10<link rel="next" href="std_array.html" title="C++11 Array Container"> 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="../adapted.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../adapted.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="std_array.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.adapted.c_array"></a><a class="link" href="c_array.html" title="C array">C array</a> 28</h4></div></div></div> 29<p> 30 C arrays are adapted to the Boost.Geometry point concept 31 </p> 32<h6> 33<a name="geometry.reference.adapted.c_array.h0"></a> 34 <span class="phrase"><a name="geometry.reference.adapted.c_array.description"></a></span><a class="link" href="c_array.html#geometry.reference.adapted.c_array.description">Description</a> 35 </h6> 36<p> 37 C arrays, such as double[2] or int[3], are (optionally) adapted to the 38 Boost.Geometry point concept. They can therefore be used in many Boost.Geometry 39 algorithms. 40 </p> 41<p> 42 Note that a C array cannot be the point type of a linestring or a polygon. 43 The reason for that is that a std::vector does not allow containing C arrays 44 (this is not related to Boost.Geometry). The C array is therefore limited 45 to the point type. 46 </p> 47<h6> 48<a name="geometry.reference.adapted.c_array.h1"></a> 49 <span class="phrase"><a name="geometry.reference.adapted.c_array.model_of"></a></span><a class="link" href="c_array.html#geometry.reference.adapted.c_array.model_of">Model 50 of</a> 51 </h6> 52<p> 53 <a class="link" href="../concepts/concept_point.html" title="Point Concept">Point Concept</a> 54 </p> 55<h6> 56<a name="geometry.reference.adapted.c_array.h2"></a> 57 <span class="phrase"><a name="geometry.reference.adapted.c_array.header"></a></span><a class="link" href="c_array.html#geometry.reference.adapted.c_array.header">Header</a> 58 </h6> 59<p> 60 <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="identifier">c_array</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> 61 </p> 62<p> 63 The standard header <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span></code> 64 does not include this header. 65 </p> 66<h6> 67<a name="geometry.reference.adapted.c_array.h3"></a> 68 <span class="phrase"><a name="geometry.reference.adapted.c_array.example"></a></span><a class="link" href="c_array.html#geometry.reference.adapted.c_array.example">Example</a> 69 </h6> 70<p> 71 Small example showing the combination of an array with a Boost.Geometry 72 algorithm 73 </p> 74<p> 75</p> 76<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> 77<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 78<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="identifier">c_array</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 79 80<span class="identifier">BOOST_GEOMETRY_REGISTER_C_ARRAY_CS</span><span class="special">(</span><span class="identifier">cs</span><span class="special">::</span><span class="identifier">cartesian</span><span class="special">)</span> 81 82<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 83<span class="special">{</span> 84 <span class="keyword">int</span> <span class="identifier">a</span><span class="special">[</span><span class="number">3</span><span class="special">]</span> <span class="special">=</span> <span class="special">{</span><span class="number">1</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">};</span> 85 <span class="keyword">int</span> <span class="identifier">b</span><span class="special">[</span><span class="number">3</span><span class="special">]</span> <span class="special">=</span> <span class="special">{</span><span class="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">,</span> <span class="number">4</span><span class="special">};</span> 86 87 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> 88 89 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 90<span class="special">}</span> 91</pre> 92<p> 93 </p> 94<p> 95 Output: 96 </p> 97<pre class="programlisting">1.73205 98</pre> 99</div> 100<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 101<td align="left"></td> 102<td align="right"><div class="copyright-footer">Copyright © 2009-2019 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam 103 Wulkiewicz, Oracle and/or its affiliates<p> 104 Distributed under the Boost Software License, Version 1.0. (See accompanying 105 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>) 106 </p> 107</div></td> 108</tr></table> 109<hr> 110<div class="spirit-nav"> 111<a accesskey="p" href="../adapted.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../adapted.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="std_array.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 112</div> 113</body> 114</html> 115
