[vtkusers] how to create a vtkDataSet according to the type of the input

[frank]

Thank you, David

data = input->NewInstance();


> 在 2017年11月7日，19:05，David E DeMarle <dave.demarle at kitware.com> 写道：
> 
> Try data->NewInstance()
> 
>> On Nov 7, 2017 3:03 AM, "frank" <frank1985876 at gmail.com> wrote:
>> Hi, all
>> 
>> If I want to create a vtkDataSet according to type of the input (vtkDataSet*), I can do that with the code below.
>> Is there any way to get rid of those if-else? Any way like vtkDataArray do? vtkDataArray* a = vtkDataArray::CreateDataArray(array->GetDataType());
>> 
>> //----------------
>> vtkDataSet *data;
>> if (input->IsA("vtkImageData"))
>>     data = vtkImageData::New();
>> else if (input->IsA("vtkStructuredGrid"))
>>     data = vtkStructuredGrid::New();
>> …
>> //----------------
>> 
>> Thank you!
>> 
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