std::back_inserter

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

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

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

Parameters

Return value

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

Possible implementation

template<class Container>
std::back_insert_iterator<Container> back_inserter(Container& c)
{
    return std::back_insert_iterator<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';
}

1 2 3 4 5 6 7 8 9 10 -1 -1 -1

See also