COMP: Add compiler deduction guides RLEImage ImageScanlineConstIterator

This addresses InsightSoftwareConsortium/ITK#4537 In addition to SmartPointer arguments, we need a raw const pointer version. Suggested-by: Niels Dekker <N.Dekker@lumc.nl>
KitwareMedical · Apr 2, 2024 · 85559c9 · 85559c9
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diff --git a/include/itkRLEImageScanlineConstIterator.h b/include/itkRLEImageScanlineConstIterator.h
@@ -178,6 +178,18 @@ class ImageScanlineConstIterator<RLEImage<TPixel, VImageDimension, CounterType>>
     return *this;
   }
 };
+
+// Deduction guide for class template argument deduction (CTAD).
+template <typename TPixel, unsigned int VImageDimension, typename CounterType>
+ImageScanlineConstIterator(SmartPointer<const RLEImage<TPixel, VImageDimension, CounterType>>,
+                           const typename RLEImage<TPixel, VImageDimension, CounterType>::RegionType &)
+  ->ImageScanlineConstIterator<RLEImage<TPixel, VImageDimension, CounterType>>;
+
+template <typename TPixel, unsigned int VImageDimension, typename CounterType>
+ImageScanlineConstIterator(const RLEImage<TPixel, VImageDimension, CounterType> *,
+                           const typename RLEImage<TPixel, VImageDimension, CounterType>::RegionType &)
+  ->ImageScanlineConstIterator<RLEImage<TPixel, VImageDimension, CounterType>>;
+
 } // end namespace itk
 
 #endif // itkRLEImageScanlineConstIterator_h
diff --git a/include/itkRLEImageScanlineIterator.h b/include/itkRLEImageScanlineIterator.h
@@ -102,6 +102,13 @@ class ImageScanlineIterator<RLEImage<TPixel, VImageDimension, CounterType>>
     return *this;
   }
 };
+
+// Deduction guide for class template argument deduction (CTAD).
+template <typename TPixel, unsigned int VImageDimension, typename CounterType>
+ImageScanlineIterator(SmartPointer<RLEImage<TPixel, VImageDimension, CounterType>>,
+                      const typename RLEImage<TPixel, VImageDimension, CounterType>::RegionType &)
+  ->ImageScanlineIterator<RLEImage<TPixel, VImageDimension, CounterType>>;
+
 } // end namespace itk
 
 #endif // itkRLEImageScanlineIterator_h