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Mini helper templates

The mini helper templates simplify the description of the main helper templates and member functions. They are not included in the C++ standard documents.

std::ranges::concat_view::iterator::satisfy<N>

Adjusts the current (global) position of it_  .

• If N is sizeof...(Views) - 1, does nothing.
• Otherwise, equivalent to if (get-iter  <N>() == get-end  <N>())
  {
      it_  .template emplace<N + 1>(get-begin  <N + 1>());
      satisfy <N + 1>();
  }.

std::ranges::concat_view::iterator::prev<N>

Moves it_ to the previous (global) position.

• If N is ​0​, equivalent to --get-iter  <0>();.
• Otherwise, equivalent to if (get-iter  <N>() == get-begin  <N>())
  {
      it_  .template emplace<N - 1>(get-end  <N - 1>());
      prev <N - 1>();
  }
  else
      --get-iter  <N>();.

std::ranges::concat_view::iterator::advance-fwd<N>

Advances the current (global) position step steps forward.

• If N is sizeof...(Views) - 1, equivalent to get-iter  <N>() += to-underlying-diff-type  (steps);.
• Otherwise, equivalent to auto n_size = ranges::distance (get-view  <N>()));
  if (offset + steps < n_size)
      get-iter  <N>() += to-underlying-diff-type  (steps);
  else
  {
      it_  .template emplace<N + 1>(get-begin  <N + 1>());
      advance-fwd <N + 1>(0, offset + steps - n_size);
  }.

Parameters

std::ranges::concat_view::iterator::advance-bwd<N>

Advances the current (global) position steps steps backward.

• If N is ​0​, equivalent to get-iter  <N>() -= to-underlying-diff-type  (steps);.
• Otherwise, equivalent to if (offset >= steps)
      get-iter  <N>() -= to-underlying-diff-type  (steps);
  else
  {
      auto prev_size = ranges::distance (get-view  <N - 1>());
      it_  .template emplace<N - 1>(get-end  <N - 1>());
      advance-bwd <N - 1>(prev_size, steps - offset);
  }.

Parameters