From f60dc98cef6bddfef1552b02d9622f3333c4730b Mon Sep 17 00:00:00 2001
From: Niels Dekker <N.Dekker@lumc.nl>
Date: Sat, 25 Mar 2023 19:13:07 +0100
Subject: [PATCH] COMP: Declare `operator<(const SliceIterator &)` member
 function const

The original code erroneously disallowed evaluating the expression `lhs < rhs`
when `lhs` would be a `const` reference to a SliceIterator.
---
 Modules/Core/Common/include/itkSliceIterator.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/Core/Common/include/itkSliceIterator.h b/Modules/Core/Common/include/itkSliceIterator.h
index 3f3962a09c3..13ab52ff284 100644
--- a/Modules/Core/Common/include/itkSliceIterator.h
+++ b/Modules/Core/Common/include/itkSliceIterator.h
@@ -116,7 +116,7 @@ class SliceIterator
    * is only true if the slice iterators have the same stride and
    * start location. */
   bool
-  operator<(const SliceIterator & orig)
+  operator<(const SliceIterator & orig) const
   {
     return this->m_Pos < orig.m_Pos && this->m_Slice.stride() == orig.m_Slice.stride() &&
            this->m_Slice.start() == orig.m_Slice.start();