[vtk-developers] RFC: STL algos and C++11 for-range syntax with vtkDataArrays

[Allie Vacanti]

On Fri, Nov 9, 2018 at 8:45 AM David E DeMarle <dave.demarle at kitware.com>
wrote:

> +1 for the idea of converting vtk collections into stl conventions.
>

et voila:

https://gitlab.kitware.com/vtk/vtk/commit/dd3fce7815ff2285a7b93e2ee5a642cdcd066626?merge_request_iid=4826

vtkCollection *collection = ...;
for (auto item : vtk::Range(collection))
{
  // item is a vtkObject*.
}

vtkRendererCollection *renCollection = ...;
for (auto item : vtk::Range(renCollection))
{
  // item is a vtkRenderer*. Type deduction works for all
  // collection types that define a GetNextItem() method
  // with a specialized type.
}

This design leaves the door open for other usages of vtk::Range(iterable)
in the future. vtkCellIterators come to mind...

Allie


> On Fri, Nov 9, 2018, 6:49 AM Todd via vtk-developers <
> vtk-developers at public.kitware.com> wrote:
>
>> Nice blog.
>>
>> On 10 Nov 2018 12:00 a.m., Allie Vacanti <allison.vacanti at kitware.com>
>> wrote:
>>
>> On Fri, Nov 9, 2018, 2:07 AM Elvis Stansvik <elvis.stansvik at orexplore.com
>> wrote:
>>
>> Any plans for something similar for vtkCollection*?
>>
>>
>> Not currently, but that would be a very useful feature indeed. I think
>> it'd be more than worthwhile to add a template that just translates the VTK
>> iteration convention (InitTraversal, GoToNextItem, IsDoneWithTraversal) to
>> a set of STL iterators/range objects. This would allow it to work with
>> quite a few different iterables in VTK.
>>
>> It'd have a similarly usage as the array iterators:
>>
>> vtk[...]Collection *myCollection = ...;
>> for (auto item : vtk::Range(myCollection)) { ... }
>>
>> I'll put this on my list to look at in my spare cycles.  Good suggestion!
>>
>>
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