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Upgrade from version 1.42

New features:

  1. Range adaptors
  2. Range algorithms


  1. iterator_range no longer has a is_singular member function. The singularity restrictions have been removed from the iterator_range class since this added restrictions to ranges of iterators whose default constructors were not singular. Previously the is_singular member function always returned false in release build configurations, hence it is not anticipated that this interface change will produce difficulty in upgrading.