index_sequence.h

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#ifndef RCPP_TRAITS_INDEX_SEQUENCE_H
#define RCPP_TRAITS_INDEX_SEQUENCE_H
 
namespace Rcpp {
namespace traits {
  template <int...>
  struct index_sequence {};
 
  template <int N, int... Is>
  struct make_index_sequence : make_index_sequence<N-1, N-1, Is...> {};
 
  template <int... Is>
  struct make_index_sequence<0, Is...> : index_sequence<Is...> {};
}
}
 
#endif