26 Algorithms library [algorithms]

26.10 Generalized numeric operations [numeric.ops]

26.10.13 Iota [numeric.iota]

template<class ForwardIterator, class T>
  constexpr void iota(ForwardIterator first, ForwardIterator last, T value);

Mandates: T is convertible to ForwardIterator's value type.

The expression ++val, where val has type T, is well-formed.

Effects: For each element referred to by the iterator i in the range [first, last), assigns *i = value and increments value as if by ++value.

Complexity: Exactly last - first increments and assignments.

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template<input_or_output_iterator O, sentinel_for<O> S, weakly_incrementable T>
  requires indirectly_writable<O, const T&>
  constexpr ranges::iota_result<O, T> ranges::iota(O first, S last, T value);
template<weakly_incrementable T, output_range<const T&> R>
  constexpr ranges::iota_result<borrowed_iterator_t<R>, T> ranges::iota(R&& r, T value);

Effects: Equivalent to: while (first != last) { *first = as_const(value); ++first; ++value; } return {std::move(first), std::move(value)};