Remove backslash (+ indent) from string literals

Modules/Core/Common/include/itkImageSource.hxx

@@ -254,8 +254,8 @@ ImageSource<TOutputImage>::ThreadedGenerateData(const OutputImageRegionType &
 #if !defined(ITK_LEGACY_REMOVE)
   this->DynamicThreadedGenerateData(region);
 #else
-  itkExceptionMacro("With DynamicMultiThreadingOff subclass should override this method. \
-The signature of ThreadedGenerateData() has been changed in ITK v4 to use the new ThreadIdType.");
+  itkExceptionMacro("With DynamicMultiThreadingOff subclass should override this method. The signature of "
+                    "ThreadedGenerateData() has been changed in ITK v4 to use the new ThreadIdType.");
 #endif
 }
 
@@ -264,9 +264,9 @@ template <typename TOutputImage>
 void
 ImageSource<TOutputImage>::DynamicThreadedGenerateData(const OutputImageRegionType &)
 {
-  itkExceptionMacro("Subclass should override this method!!! \
-If old behavior is desired invoke this->DynamicMultiThreadingOff(); \
-before Update() is called. The best place is in class constructor.");
+  itkExceptionMacro(
+    "Subclass should override this method!!! If old behavior is desired invoke this->DynamicMultiThreadingOff(); "
+    "before Update() is called. The best place is in class constructor.");
 }
 
 // Callback routine used by the classic threading library. This routine just calls

Modules/Core/Common/include/itkPlatformMultiThreader.h

@@ -72,16 +72,14 @@ class ITKCommon_EXPORT PlatformMultiThreader : public MultiThreaderBase
    * of threads was accepted. Legacy: use MultiThreaderBase to invoke these. */
   itkLegacyMacro(static void SetGlobalMaximumNumberOfThreads(ThreadIdType val))
   {
-    itkGenericOutputMacro("Warning: SetGlobalMaximumNumberOfThreads \
-should now be called on itk::MultiThreaderBase. \
-It can affect all MultiThreaderBase's derived classes in ITK");
+    itkGenericOutputMacro("Warning: SetGlobalMaximumNumberOfThreads should now be called on itk::MultiThreaderBase. It "
+                          "can affect all MultiThreaderBase's derived classes in ITK");
     Superclass::SetGlobalMaximumNumberOfThreads(val);
   }
   itkLegacyMacro(static ThreadIdType GetGlobalMaximumNumberOfThreads())
   {
-    itkGenericOutputMacro("Warning: GetGlobalMaximumNumberOfThreads \
-should now be called on itk::MultiThreaderBase. \
-It can affect all MultiThreaderBase's derived classes in ITK");
+    itkGenericOutputMacro("Warning: GetGlobalMaximumNumberOfThreads should now be called on itk::MultiThreaderBase. It "
+                          "can affect all MultiThreaderBase's derived classes in ITK");
     return Superclass::GetGlobalMaximumNumberOfThreads();
   }
 
@@ -91,16 +89,14 @@ It can affect all MultiThreaderBase's derived classes in ITK");
    * of threads was accepted. Legacy: use MultiThreaderBase to invoke these. */
   itkLegacyMacro(static void SetGlobalDefaultNumberOfThreads(ThreadIdType val))
   {
-    itkGenericOutputMacro("Warning: SetGlobalDefaultNumberOfThreads \
-should now be called on itk::MultiThreaderBase. \
-It can affect all MultiThreaderBase's derived classes in ITK");
+    itkGenericOutputMacro("Warning: SetGlobalDefaultNumberOfThreads should now be called on itk::MultiThreaderBase. It "
+                          "can affect all MultiThreaderBase's derived classes in ITK");
     Superclass::SetGlobalDefaultNumberOfThreads(val);
   }
   itkLegacyMacro(static ThreadIdType GetGlobalDefaultNumberOfThreads())
   {
-    itkGenericOutputMacro("Warning: GetGlobalDefaultNumberOfThreads \
-should now be called on itk::MultiThreaderBase. \
-It can affect all MultiThreaderBase's derived classes in ITK");
+    itkGenericOutputMacro("Warning: GetGlobalDefaultNumberOfThreads should now be called on itk::MultiThreaderBase. It "
+                          "can affect all MultiThreaderBase's derived classes in ITK");
     return Superclass::GetGlobalDefaultNumberOfThreads();
   }
 #endif

Modules/Core/Common/include/itkVersor.hxx

@@ -209,8 +209,7 @@ Versor<T>::Normalize()
   if (itk::Math::abs(tensor) < 1e-20)
   {
     ExceptionObject except;
-    except.SetDescription("Attempt to normalize a \
-                           itk::Versor with zero tensor");
+    except.SetDescription("Attempt to normalize a itk::Versor with zero tensor");
     except.SetLocation(__FILE__);
     throw except;
   }

Modules/Core/Common/src/itkMultiThreaderBase.cxx

@@ -152,10 +152,8 @@ MultiThreaderBase::GetGlobalDefaultThreaderPrivate()
              itksys::SystemTools::GetEnv("ITK_USE_THREADPOOL", envVar))
     {
       envVar = itksys::SystemTools::UpperCase(envVar);
-      itkGenericOutputMacro("Warning: ITK_USE_THREADPOOL \
-has been deprecated since ITK v5.0. \
-You should now use ITK_GLOBAL_DEFAULT_THREADER\
-\nFor example ITK_GLOBAL_DEFAULT_THREADER=Pool");
+      itkGenericOutputMacro("Warning: ITK_USE_THREADPOOL has been deprecated since ITK v5.0. You should now use "
+                            "ITK_GLOBAL_DEFAULT_THREADER\nFor example ITK_GLOBAL_DEFAULT_THREADER=Pool");
       if (envVar != "NO" && envVar != "OFF" && envVar != "FALSE")
       {
 #ifdef __EMSCRIPTEN__

Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshEulerOperatorDeleteCenterVertexFunction.hxx

@@ -83,8 +83,8 @@ QuadEdgeMeshEulerOperatorDeleteCenterVertexFunction<TMesh, TQEType>::Evaluate(QE
   }
   if (!SecondFaceFound)
   {
-    itkDebugMacro("DeleteVertex requires at least two distinct \
-    facets incident to the facets that are incident to g->GetDestination().");
+    itkDebugMacro("DeleteVertex requires at least two distinct facets incident to the facets that are incident to "
+                  "g->GetDestination().");
     return ((QEType *)nullptr);
   }
 

Modules/Numerics/Statistics/include/itkDistanceMetric.h

@@ -119,8 +119,7 @@ class ITK_TEMPLATE_EXPORT DistanceMetric : public FunctionBase<TVector, double>
       // exception
       if (defaultLength != s)
       {
-        itkExceptionMacro("Attempting to change the measurement \
-                           vector size of a non-resizable vector type");
+        itkExceptionMacro("Attempting to change the measurement vector size of a non-resizable vector type");
       }
     }
   }

Modules/Numerics/Statistics/include/itkImageClassifierFilter.hxx

@@ -138,8 +138,7 @@ ImageClassifierFilter<TSample, TInputImage, TOutputImage>::GenerateData()
 
   if (membershipFunctionsWeightsArray.Size() != this->m_NumberOfClasses)
   {
-    itkExceptionMacro("Membership functions weight array size does not match the\
-                      number of classes ");
+    itkExceptionMacro("Membership functions weight array size does not match the number of classes ");
   }
 
   const auto * inputImage = static_cast<const InputImageType *>(this->ProcessObject::GetInput(0));

Modules/Numerics/Statistics/include/itkSample.h

@@ -131,8 +131,7 @@ class Sample : public DataObject
         // only change the measurement vector size if the container is empty.
         if (this->Size())
         {
-          itkExceptionMacro("Attempting to change the measurement \
-          vector size of a non-empty Sample");
+          itkExceptionMacro("Attempting to change the measurement vector size of a non-empty Sample");
         }
         else
         {
@@ -149,8 +148,7 @@ class Sample : public DataObject
       // exception
       if (defaultLength != s)
       {
-        itkExceptionMacro("Attempting to change the measurement \
-                           vector size of a non-resizable vector type");
+        itkExceptionMacro("Attempting to change the measurement vector size of a non-resizable vector type");
       }
     }
   }

Modules/Numerics/Statistics/include/itkSampleClassifierFilter.hxx

@@ -142,8 +142,7 @@ SampleClassifierFilter<TSample>::GenerateData()
 
   if (membershipFunctionsWeightsArray.Size() != this->m_NumberOfClasses)
   {
-    itkExceptionMacro("Membership functions weight array size does not match the\
-                      number of classes ");
+    itkExceptionMacro("Membership functions weight array size does not match the number of classes ");
   }
 
   const auto * sample = static_cast<const SampleType *>(this->ProcessObject::GetInput(0));

Modules/Numerics/Statistics/include/itkStatisticsAlgorithm.hxx

@@ -260,8 +260,7 @@ FindSampleBound(const TSample *                           sample,
 
   if (sample->Size() == 0)
   {
-    itkGenericExceptionMacro(<< "Attempting to compute bounds of a sample list containing no\
-       measurement vectors");
+    itkGenericExceptionMacro(<< "Attempting to compute bounds of a sample list containing no measurement vectors");
   }
 
   min = begin.GetMeasurementVector();

Modules/Registration/Common/include/itkCompareHistogramImageToImageMetric.hxx

@@ -138,8 +138,7 @@ CompareHistogramImageToImageMetric<TFixedImage, TMovingImage>::FormTrainingHisto
 
   if (NumberOfPixelsCounted == 0)
   {
-    itkExceptionMacro(<< "All the points mapped to outside of the Training moving \
-age");
+    itkExceptionMacro(<< "All the points mapped to outside of the Training moving age");
   }
 }