问题描述
我有一个模板类 myClass< T>
,其中T可以是一个标量(浮点数,整数,双精度数等)。 b $ b我想创建一个 vtkFloatArray
, vtkIntArray
或 vtkDoubleArray
,取决于类型T。
I have a template class myClass<T>
, where T can be a scalar (float, int, double, etc.)I would like to create a vtkFloatArray
, vtkIntArray
, or vtkDoubleArray
, depending on the type T.
我认为 vtkDataArrayTemplate< T>
会很好解。
不幸的是,它是一个虚拟类,所以我不能这样写:
I thought that vtkDataArrayTemplate<T>
would be a good solution.Unfortunately, it is a virtual class, so I can't write this :
vtkSmartPointer< vtkDataArrayTemplate<T> > array = vtkSmartPointer<vtkDataArrayTemplate<T> >::New();
因为当我尝试实例化myClass时,出现错误:
because when I try to instantiate a myClass, I get the error :
error: invalid conversion from ‘vtkObject*’ to ‘vtkDataArrayTemplate<float>*’ [-fpermissive]`
我认为这是因为 vtkDataArrayTemplate :: New()
不存在(因为该类是虚拟),因此调用 vtkObject :: New()
。然后我们知道它不能将 vtkObject
转换为 vtkDataArrayTemplate
。
I think it's because vtkDataArrayTemplate::New()
doesn't exist (because the class is virtual), so vtkObject::New()
is called instead. Then we understand that it can't transform a vtkObject
into a vtkDataArrayTemplate
.
所以我的问题是:
是否有 vtkDataArrayTemplate
的非虚拟版本当T为 float
, vtkDoubleArray
vtkFloatArray >当T为 double
等时??
Is there an non-virtual version of vtkDataArrayTemplate
that would allow me to create a vtkFloatArray
when T is float
, vtkDoubleArray
when T is double
, etc. ?
PS:我使用的是VTK 6.0.0
P.S: I use VTK 6.0.0
推荐答案
给vtk用户邮件列表的电子邮件也帮助了我。
中的一个有用的静态函数已被使用指向我:
An email to the vtk-users mailing list helped me on this too.A useful static function in vtkDataArray has been pointed to me:
vtkDataArray::CreateDataArray(int dataType)
它允许创建类型为dataType的数据数组。
It allows to create a data array of the type dataType.
现在,要转换模板参数 T
转换为vtk类型,我使用了 :(感谢您 norisknofun )
Now, to transform the template parameter T
into a vtk type, I used the code I mentionned in this other post: (thank you norisknofun)
#include <vtkType.h>
int GetVTKType(std::size_t hash_code)
{
static std::map<std::size_t, long> typeMap;
if(typeMap.empty())
{
typeMap[typeid(void).hash_code()] = VTK_VOID;
typeMap[typeid(char).hash_code()] = VTK_CHAR;
typeMap[typeid(signed char).hash_code()] = VTK_SIGNED_CHAR;
typeMap[typeid(unsigned char).hash_code()] = VTK_UNSIGNED_CHAR;
typeMap[typeid(short).hash_code()] = VTK_SHORT;
typeMap[typeid(unsigned short).hash_code()] = VTK_UNSIGNED_SHORT;
typeMap[typeid(int).hash_code()] = VTK_INT;
typeMap[typeid(unsigned int).hash_code()] = VTK_UNSIGNED_INT;
typeMap[typeid(long).hash_code()] = VTK_LONG;
typeMap[typeid(unsigned long).hash_code()] = VTK_UNSIGNED_LONG;
typeMap[typeid(float).hash_code()] = VTK_FLOAT;
typeMap[typeid(double).hash_code()] = VTK_DOUBLE;
typeMap[typeid(std::string).hash_code()] = VTK_STRING;
typeMap[typeid(long long).hash_code()] = VTK_LONG_LONG;
typeMap[typeid(unsigned long long).hash_code()] = VTK_UNSIGNED_LONG_LONG;
typeMap[typeid(int64_t).hash_code()] = VTK___INT64;
typeMap[typeid(uint64_t).hash_code()] = VTK_UNSIGNED___INT64;
}
return typeMap[hash_code];
}
因此,最终代码为:
vtkDataArray *array =
vtkDataArray::CreateDataArray(GetVTKType(typeid(T).hash_code()));
这篇关于vtkDataArrayTemplate的非虚拟版本的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!