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# std::inserter

From cppreference.com
< cpp‎ | iterator

Defined in header `<iterator>` |  |
template< class Container > std::insert_iterator<Container> inserter( Container& c, typename Container::iterator i ); |  |

`inserter` is a convenience function template that constructs a std::insert_iterator for the container `c` and its iterator `i` with the type deduced from the type of the argument.

### [edit] Parameters

c | - | container that supports a `insert` operation
i | - | iterator in `c` indicating the insertion position

### [edit] Return value

A std::insert_iterator which can be used to insert elements into the container `c` at the position indicated by `i`.

### [edit] Possible implementation

    template< class Container >
    std::insert_iterator<Container> inserter( Container& c, typename Container::iterator i )
    {
        return std::insert_iterator<Container>(c, i);
    }

### [edit] Example

Run this code

    #include <iostream>
    #include <list>
    #include <algorithm>
    #include <iterator>
    #include <set>

    int main()
    {
        std::list<int> l{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
        std::multiset<int> s;

        std::fill_n(std::inserter(l, std::next(l.begin())), 3, -1);
        std::fill_n(std::inserter(s, s.begin()), 3, -1);

        for (int n : l) {
            std::cout << n << ' ';
        }
        std::cout << '\n';

        for (int n : s) {
            std::cout << n << ' ';
        }
        std::cout << '\n';
    }

Output:

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

### [edit] See also

insert_iterator | iterator adaptor for insertion into a container (class template) [edit]
back_inserter | creates a std::back_insert_iterator of type inferred from the argument (function template) [edit]
front_inserter | creates a std::front_insert_iterator of type inferred from the argument (function template) [edit]

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