The sole purpose of this namespace is to be able to import all functions and symbols that are expected to be used within operator() for indexing and slicing. If you already imported the whole Eigen namespace:
Namespace containing all symbols from the Eigen library.
Definition: Core:141
then you are already all set. Otherwise, if you don't want/cannot import the whole Eigen namespace, the following line:
is equivalent to:
static const symbolic::SymbolExpr< internal::symbolic_last_tag > last
Definition: IndexedViewHelper.h:38
static const auto lastp1
Definition: IndexedViewHelper.h:53
static const Eigen::internal::all_t all
Definition: IndexedViewHelper.h:171
auto seq(FirstType f, LastType l, IncrType incr)
ArithmeticSequence< typename internal::cleanup_index_type< FirstType >::type, typename internal::cleanup_index_type< SizeType >::type, typename internal::cleanup_seq_incr< IncrType >::type > seqN(FirstType first, SizeType size, IncrType incr)
Definition: ArithmeticSequence.h:162
auto lastN(SizeType size, IncrType incr) -> decltype(seqN(Eigen::last-(size-fix< 1 >()) *incr, size, incr))
Definition: ArithmeticSequence.h:331