<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Thank you, David<div><br></div><div>data = input->NewInstance();</div><div><br></div><div><div><br>在 2017年11月7日，19:05，David E DeMarle <<a href="mailto:dave.demarle@kitware.com">dave.demarle@kitware.com</a>> 写道：<br><br></div><blockquote type="cite"><div><div dir="auto">Try data->NewInstance()</div><div class="gmail_extra"><br><div class="gmail_quote">On Nov 7, 2017 3:03 AM, "frank" <<a href="mailto:frank1985876@gmail.com">frank1985876@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, all<br>
<br>
If I want to create a vtkDataSet according to type of the input (vtkDataSet*), I can do that with the code below.<br>
Is there any way to get rid of those if-else? Any way like vtkDataArray do? vtkDataArray* a = vtkDataArray::CreateDataArray(<wbr>array->GetDataType());<br>
<br>
//----------------<br>
vtkDataSet *data;<br>
if (input->IsA("vtkImageData"))<br>
data = vtkImageData::New();<br>
else if (input->IsA("<wbr>vtkStructuredGrid"))<br>
data = vtkStructuredGrid::New();<br>
…<br>
//----------------<br>
<br>
Thank you!<br>
<br>
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