Commits on Feb 5, 2023

1. STYLE: Make PrintSelf implementation style consistent …

   Make `PrintSelf`implementation style consistent following the ITK SWG
   coding style guideline and the available ITK macros:
   - Always print the superclass first.
   - Print only the class instance variables.
   - Use the `os << indent << "{ivarName}: " << m_ivarName << std::endl`
     recipe: do not print the leading `m_` of the ivar; use a colon after
     printing its name; leave a whitespace between the colon and the
     printed value of the ivar.
   - For boolean ivars print `On`/`Off` according to their values using the
     ternary operator.
   - Use `itkPrintSelfObjectMacro` to print objects inheriting from
     `itk::LightObject` that can be null.
   - For pointers that do not inherit from `itk::LightObject` check whether
     they are non-null before attempting to print them and print the
     `(empty)` string otherwise.
   - Rely on the self printing ability of the ITK classes to avoid
     boilerplate code when printing the corresponding ivars in other
     classes' `PrintSelf` methods.
   - Take advantage of the output stream `<<` insertion operator overload
     for `std::vector` types in the `itk::print_helper` namespace defined
     in `itkPrintHelper.h` to print such types consistently.
   - Cast custom types to their numerical values using
     `itk::NumericTraits::PrinType` so that they are printed as expected.
   - Remove statements printing the hard-coded class name and its own
     pointer, e.g.
     ```
     os << indent << "ArrowSpatialObject(" << this << ")" << std::endl;
     ```
     `PrintSelf` does this without requiring the removed line.
   - Save typing `this->` to point to the instance of the current class.
   
   Apply the same principles to the `<<` operator overloads.
   
   Overload the ostream operator for the `FixedImageSamplePoint` class used
   by the `itk::ImageToImageMetric` class.
   
   Overload the ostream operator for the `ImageVoxel` class used by the
   `itk::DeformableSimplexMesh3DGradientConstraintForceFilter` class.

   

   jhlegarreta committed Feb 5, 2023
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