std::back_inserter

Defined in header <iterator>

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

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.

Parameters

container that supports a push_back operation

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 <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
  
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 << ' ';
}

Output:

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

back_insert_iterator	iterator adaptor for insertion at the end of a container (class template)
front_inserter	creates a `std::front_insert_iterator` of type inferred from the argument (function template)
inserter	creates a `std::insert_iterator` of type inferred from the argument (function template)

std::back_inserter

Parameters

Return value

Possible implementation

Example

See also