What does iota of std::iota stand for?

std::iota is a function template in the C++ standard library, included in the <numeric> header. The name "iota" originates from the ninth letter of the Greek alphabet, "ι" (iota), and is used here to represent incremental operations. std::iota assigns a sequence of incrementing values to a range. This function takes three parameters: a begin iterator, an end iterator, and an initial value. It starts from the initial value, assigns it to each element in sequence, and increments the value until the end of the range is reached. For example, if I have an integer array of size 5 and I want to initialize it with consecutive integers starting from 10, I can use std::iota as follows:

cpp
#include <iostream>
#include <numeric>
#include <array>

int main() {
    std::array<int, 5> arr;
    std::iota(arr.begin(), arr.end(), 10);

    for (int num : arr) {
        std::cout << num << " ";
    }
}

The output of this code will be:

shell
10 11 12 13 14 

Each element is the previous element's value plus one, which is exactly what std::iota does. This function is ideal for scenarios requiring the quick generation of incrementing sequences.