1 // Boost.Geometry (aka GGL, Generic Geometry Library)
2 // QuickBook Example
3
4 // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
5
6 // Use, modification and distribution is subject to the Boost Software License,
7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
8 // http://www.boost.org/LICENSE_1_0.txt)
9
10 //[boost_fusion
11 //` Shows how to combine Boost.Fusion with Boost.Geometry
12
13 #include <iostream>
14
15 #include <boost/fusion/include/adapt_struct_named.hpp>
16
17 #include <boost/geometry.hpp>
18 #include <boost/geometry/geometries/adapted/boost_fusion.hpp>
19
20
21 struct sample_point
22 {
23 double x, y, z;
24 };
25
26 BOOST_FUSION_ADAPT_STRUCT(sample_point, (double, x) (double, y) (double, z))
BOOST_GEOMETRY_REGISTER_BOOST_FUSION_CS(cs::cartesian)27 BOOST_GEOMETRY_REGISTER_BOOST_FUSION_CS(cs::cartesian)
28
29 int main()
30 {
31 sample_point a, b, c;
32
33 // Set coordinates the Boost.Geometry way (one of the ways)
34 boost::geometry::assign_values(a, 3, 2, 1);
35
36 // Set coordinates the Boost.Fusion way
37 boost::fusion::at_c<0>(b) = 6;
38 boost::fusion::at_c<1>(b) = 5;
39 boost::fusion::at_c<2>(b) = 4;
40
41 // Set coordinates the native way
42 c.x = 9;
43 c.y = 8;
44 c.z = 7;
45
46 std::cout << "Distance a-b: " << boost::geometry::distance(a, b) << std::endl;
47 std::cout << "Distance a-c: " << boost::geometry::distance(a, c) << std::endl;
48
49 return 0;
50 }
51
52 //]
53
54 //[boost_fusion_output
55 /*`
56 Output:
57 [pre
58 Distance a-b: 5.19615
59 Distance a-c: 10.3923
60 ]
61 */
62 //]
63