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std::back_inserter

From cppreference.com
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.

Contents

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

[edit] See also

iterator adaptor for insertion at the end of a container
(class template) [edit]
creates a std::front_insert_iterator of type inferred from the argument
(function template) [edit]
creates a std::insert_iterator of type inferred from the argument
(function template) [edit]