std::back_inserter

Header: <iterator>

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.

# Declarations

template< class Container >
std::back_insert_iterator<Container> back_inserter( Container& c );

(constexpr since C++20)

# Parameters

# Return value

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

# 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';
}

# See also