From a4693b507480159c572ba3c0297ab0c12ea5a3ce Mon Sep 17 00:00:00 2001
From: Niels Dekker <N.Dekker@lumc.nl>
Date: Sun, 19 Sep 2021 14:27:43 +0200
Subject: [PATCH] STYLE: Improve const-correctness of protected
 CompositeTransform members

- Added `const` to reference returned by `GetTransformsToOptimizeQueue()`
- Made `m_TransformsToOptimizeFlags` non-`mutable`
---
 Modules/Core/Transform/include/itkCompositeTransform.h   | 6 +++---
 Modules/Core/Transform/include/itkCompositeTransform.hxx | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Modules/Core/Transform/include/itkCompositeTransform.h b/Modules/Core/Transform/include/itkCompositeTransform.h
index 33c1f624d6e..f0709077ffe 100644
--- a/Modules/Core/Transform/include/itkCompositeTransform.h
+++ b/Modules/Core/Transform/include/itkCompositeTransform.h
@@ -447,11 +447,11 @@ class ITK_TEMPLATE_EXPORT CompositeTransform : public MultiTransform<TParameters
   }
 
   /** Get a list of transforms to optimize. Helper function. */
-  TransformQueueType &
+  const TransformQueueType &
   GetTransformsToOptimizeQueue() const;
 
-  mutable TransformQueueType            m_TransformsToOptimizeQueue;
-  mutable TransformsToOptimizeFlagsType m_TransformsToOptimizeFlags;
+  mutable TransformQueueType    m_TransformsToOptimizeQueue;
+  TransformsToOptimizeFlagsType m_TransformsToOptimizeFlags;
 
 private:
   mutable ModifiedTimeType m_PreviousTransformsToOptimizeUpdateTime;
diff --git a/Modules/Core/Transform/include/itkCompositeTransform.hxx b/Modules/Core/Transform/include/itkCompositeTransform.hxx
index 20e408391ef..dd62fe5dbfd 100644
--- a/Modules/Core/Transform/include/itkCompositeTransform.hxx
+++ b/Modules/Core/Transform/include/itkCompositeTransform.hxx
@@ -885,7 +885,7 @@ CompositeTransform<TParametersValueType, NDimensions>::UpdateTransformParameters
 
 
 template <typename TParametersValueType, unsigned int NDimensions>
-typename CompositeTransform<TParametersValueType, NDimensions>::TransformQueueType &
+const typename CompositeTransform<TParametersValueType, NDimensions>::TransformQueueType &
 CompositeTransform<TParametersValueType, NDimensions>::GetTransformsToOptimizeQueue() const
 {
   /* Update the list of transforms to use for optimization only if