View source for Documentation/Nightly/Developers/Tutorials/MigrationGuide/ITK4-to-ITK5

==Transition from ITK4 to ITK5==
This section lists categories of code changes necessary to build Slicer with ITK 5. Each category has a short description, an example error message, a suggested upgrade path, and references to relevant commits.

Referencing this list might be helpful if Slicer extensions require updates to be compatible with ITK 5.

Also check the ITK migration guide if more info is needed:
 * https://github.com/InsightSoftwareConsortium/ITK/blob/master/Documentation/ITK5MigrationGuide.md (ITKv5 Migration Guide)

===itkMultiThreader refactor===

Replace lines like:
  #include <itkMultiThreader.h>
  itk::MultiThreader::Pointer ProcessingThreader;

with:
  #include <itkPlatformMultiThreader.h>
  itk::PlatformMultiThreader::Pointer ProcessingThreader;

===SimpleFastMutexLock, FastMutexLock and MutexLock are deprecated===

Instead use <tt>std::mutex</tt> available in C++11

Replace:
  #include "itkSimpleFastMutexLock.h"
  #include "itkFastMutexLock.h"
  #include "itkMutexLock.h"
  SimpleFastMutexLock
  FastMutexLock
  MutexLock

with:
  #include <mutex>
  std::mutex