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Showing content from https://en.cppreference.com/w/cpp/algorithm/../iterator/back_inserter.html below:

std::back_inserter - cppreference.com

back_inserter is a convenience function template that constructs a std::back_insert_iterator for the container c with the type deduced from the type of the argument.

[edit] Parameters c - container that supports a push_back operation [edit] Return value

A std::back_insert_iterator which can be used to add elements to the end of the container c.

[edit] Possible implementation [edit] Example
#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>
 
int main()
{
    std::vector<int> v{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    std::fill_n(std::back_inserter(v), 3, -1);
    for (int n : v)
        std::cout << n << ' ';
    std::cout << '\n';
}

Output:

1 2 3 4 5 6 7 8 9 10 -1 -1 -1
[edit] See also

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