[Insight-users] Automatically deducing SmartPointer function template parameter

[Bradley Lowekamp]

Hello David,

You can simply overload the function with both the pointer and the SmartPointer arguments as was done with the constructor here:

http://www.itk.org/SimpleITKDoxygen/html/classitk_1_1simple_1_1Image.html

Brad

========================================================
Bradley Lowekamp  
Medical Science and Computing for
Office of High Performance Computing and Communications
National Library of Medicine 
blowekamp at mail.nih.gov

On Jan 7, 2012, at 4:59 PM, David Doria wrote:

> I have a tons functions with this type of signature:
> 
> template <typename TImage>void MyFunction(TImage* image)
> If I create an image like this:
> 
> typedef itk::Image<int, 2> ImageType;
> ImageType::Pointer image = ImageType::New();
> 
> And pass it like this:MyFunction(image);
> 
> I get an 'undefined function' error.
> 
> It works if I explicitly specify the template
> parameter:MyFunction<ImageType>(image);
> 
> It also works if I pass the raw pointer:MyFunction(image.GetPointer());
> If I change the function parameter to:
> 
> template <typename TImage>
> void MyFunctionSmartPointer(typename TImage::Pointer image)
> 
> again it works if I explicitly specify the template parameter:
> MyFunctionSmartPointer<ImageType>(image);
> 
> but still doesn't work if I just pass the smart pointer:
> MyFunctionSmartPointer(image);
> 
> and curiously also doesn't work with the raw pointer:
> MyFunctionSmartPointer(image.GetPointer());
> 
> Is there anything that can be done to pass a smart pointer to a
> function and have it automatically deduce the type?
> 
> Thanks,
> 
> David
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