c++ - 最新版本的 boost 和 boost 几何库 (GGL) 之间的冲突

Question

过去，我使用GGL库来编写一些程序。例如，以下代码适用于 GGL 和旧版本的 gcc。现在我将gcc更新到gcc4.7.1。我的程序在编译过程中出现错误。因此，我更新到最新版本的boost 1.52.1。仍然存在与 point_2d、polygon_2d 等相关的错误。我发现在最新版本的 boost 中缺少一些文件，如“cartesian2d.hpp”、“c_array_cartesian.hpp”。

有人可以帮我分析一下下面的代码并告诉我问题出在哪里吗？非常感谢。

#include <iostream>

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/polygon.hpp>
#include <boost/geometry/algorithms/distance.hpp>
#include <boost/geometry/geometry.hpp>

#include <algorithm> // for reverse, unique
#include <iostream>
#include <string>


typedef boost::geometry::model::d2::point_xy<double,        
boost::geometry::cs::cartesian> point_2d;
typedef boost::geometry::model::polygon<point_2d> polygon_2d;
using namespace boost::geometry;

int main() {
         std::cout << "!!!Hello World!!!" << std::endl; // prints !!!Hello World!!!
         model::d2::point_xy<int> p1(1.0, 1.0), p2(2.0, 2.0);
         point_2d x(3.0,3.0);
         std::cout << x.x();
         std::cout << "Distance p1-p2 is: " << distance(p1, p2) <<std::endl;

         float width = 100;
         float length = 100;


         polygon_2d poly;
         {
            const float coor[][2] = {
            {-350.0,-500.0}, {350,-500}, {350, 0}, {width/2.0, 0}, {width/2.0, length},
            {350, length}, {350, 1000}, {-350, 1000}, {-350, length}, {-1*width/2.0, length}, {-1*width/2.0,0},
            {-350, 0}, {-350.0,-500.0} // closing point is opening point
            };
            assign(poly, coor);
         }
            correct(poly);

         return 0;
}

错误如下:

c:\program files\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.7.1/
../../../../include/boost/geometry/core/point_order.hpp:1
57:12:   required from 'const boost::geometry::order_selector  
boost::geometry::point_order<float [13][2]>::value'
c:\program files\mingw64\bin\../lib/gcc/x86_64-w64-
mingw32/4.7.1/../../../../include/boost/geometry/algorithms/
assign.hpp:148:70:   required from 'void  
boost::geometry::assign(Geometry1&, const Geometry2&) [with   
Geometry1 =boost::geometry::model::polygon<boost::geometry::model
::d2::point_xy<double, boost::geometry::cs::cartesian> >; 
Geometry2 = float [13][2]]'
..\src\test.cpp:47:44:   required from here
c:\program files\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.7.1/
../../../../include/boost/geometry/core/point_order.hpp:95:5:  
error: no matching function for call to   
'assertion_failed(mpl_::failed************   
(boost::geometry::core_dispatch::point_order<void, float [13]
[2]>::NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE::************)
(mpl_::assert_::types<float [13][2], mpl_::na, mpl_::na, 
mpl_::na>))'

Answer 1

需要进行两项更改:

1) 包含 c_array.hpp，以使 2D float 组(在 const float[][2] 内部使用)适应 Boost.Geometry 点概念:

#include <boost/geometry/geometries/adapted/c_array.hpp>

2)使用分配点而不是分配。

assign_points(poly, coor);

然后你的代码就会编译。背景:您使用的是预发布版本(当然允许)，在发布时对界面进行了一些小更改。分配(带有范围)现在称为分配点。