iterator.h

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#ifndef GRPPI_COMMON_ITERATOR_H
#define GRPPI_COMMON_ITERATOR_H

namespace grppi{

template <typename ... InputIt>
void advance_iterators(size_t delta, InputIt & ... in) {
  // This hack can be done in C++14.
  // It can be simplified in C++17 with folding expressions.
  using type = int[];
  type { 0, (in += delta, 0) ...};
} 

template <typename ... InputIt>
void advance_iterators(InputIt & ... in) {
  // This hack can be done in C++14.
  // It can be simplified in C++17 with folding expressions.
  using type = int[];
  type { 0, (in++, 0) ...};
} 


}

#endif