From 85559c99ece93d695889dbc908c52efbc2bf50a9 Mon Sep 17 00:00:00 2001
From: Matt McCormick <matt.mccormick@kitware.com>
Date: Mon, 1 Apr 2024 17:51:10 -0400
Subject: [PATCH] COMP: Add compiler deduction guides RLEImage
 ImageScanlineConstIterator

This addresses
https://github.com/InsightSoftwareConsortium/ITK/issues/4537

In addition to SmartPointer arguments, we need a raw const pointer
version.

Suggested-by: Niels Dekker <N.Dekker@lumc.nl>
---
 include/itkRLEImageScanlineConstIterator.h | 12 ++++++++++++
 include/itkRLEImageScanlineIterator.h      |  7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/include/itkRLEImageScanlineConstIterator.h b/include/itkRLEImageScanlineConstIterator.h
index 20b8016..0b3c00e 100644
--- 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
index 68dca6e..761d85e 100644
--- 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