CGAL：继承和内核 [英] CGAL: Inheritance and the kernel

问题描述

CGAL问题：

我正在尝试将一个属性添加到点类。我想的第一步是继承一个内核，并用我从CGAL继承的我的Point类替换Point类。但是，只是试图迈出这一小小的第一步，我就遇到了麻烦。

Im trying the add one property to the point class. The first step I guess is to inherit a kernel and replace the point class with my own which I inherit from CGAL's. But just trying to get this small first step I run into trouble.

编辑：基于以下注释，我将继承方式更改为《手册》中所述的方式。下面的代码给出以下编译错误：

Based on the comment below I changed the inheritance to the way it's described in the Manual. The code below gives the following compile error:

• 'typename CGAL :: Extended_homogeneous :: Base'名称'CGAL :: Extended_homogeneous :: Base '，这不是课程模板|

#include <CGAL/Extended_homogeneous.h>

template < typename K_, typename K_Base >
class My_base  : public K_Base::template Base<K_>::Type
{
  typedef typename K_Base::template Base<K_>::Type   OldK;

public:
  typedef K_                                Kernel;

  template < typename Kernel2 >
  struct Base { typedef My_base<Kernel2, K_Base>  Type; };
 };

template < typename RT_ >
struct MyKernel  : public CGAL::Type_equality_wrapper<My_base<MyKernel<RT_>, CGAL::Homogeneous<RT_> >,  MyKernel<RT_> >
{};

Minimal.cpp

Minimal.cpp

#include "MyKernel.h"
#include <CGAL/Nef_polyhedron_3.h>
typedef MyKernel<CGAL::Gmpz>    Kernel;

typedef CGAL::Nef_polyhedron_3<Kernel>  Nef_Polyhedron;
typedef Nef_Polyhedron::Plane_3  Plane;

int main()
{
  Nef_Polyhedron half_space(Plane(1,1,1,1), Nef_Polyhedron::EXCLUDED);

  return 0;
}

如果将继承关系更改为 public K_Base :: Base :: template B :: Type，它将进行编译，但是我想念扩展的特性了吗？因为出现错误

If the inhertiance is changed to "public K_Base::Base::template B::Type" it will compile but Then I miss the propeties from the Extentensions I guess? Because I get the error

• 此内核无法使用构造函数

• "Constructor not available for this kernel"

当我运行程序时

推荐答案

定义正确的方法以下
中描述了您自己的内核 page 。

由于类型相等包装器使
Kernel :: Point_2等于Point_2，所以事情看起来很复杂。

The things look complicated because of the type equality wrapper which makes Kernel::Point_2 equal to Point_2.

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