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Showing content from https://cplusplus.com/reference/numeric/iota/ below:

function template

<numeric>

std::iota 
template <class ForwardIterator, class T>  void iota (ForwardIterator first, ForwardIterator last, T val);

Store increasing sequence

Assigns to every element in the range [first,last) successive values of val, as if incremented with ++val after each element is written.

The behavior of this function template is equivalent to:


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template <class ForwardIterator, class T>
  void iota (ForwardIterator first, ForwardIterator last, T val)
{
  while (first!=last) {
    *first = val;
    ++first;
    ++val;
  }
}

Parameters
first, last
Forward iterators to the initial and final positions of the sequence to be written. The range used is [first,last), which contains all the elements between first and last, including the element pointed by first but not the element pointed by last.
val
Initial value for the accumulator.

Return value none

Example 
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// iota example
#include <iostream>     // std::cout
#include <numeric>      // std::iota

int main () {
  int numbers[10];

  std::iota (numbers,numbers+10,100);

  std::cout << "numbers:";
  for (int& i:numbers) std::cout << ' ' << i;
  std::cout << '\n';

  return 0;
}

Output: 
numbers: 100 101 102 103 104 105 106 107 108 109


Complexity Linear in the distance between first and last (increments and assignments).

Data races The elements in the range [first,last) are modified (each element is modified exactly once).

Exceptions Throws if any of the assignments or increments throws.
Note that invalid arguments cause undefined behavior.

See also
accumulate
Accumulate values in range (function template)
inner_product
Compute cumulative inner product of range (function template)
adjacent_difference
Compute adjacent difference of range (function template)

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