std::front_inserter

template< class Container >
std::front_insert_iterator<Container> front_inserter( Container& c );

front_inserter is a convenience function template that constructs a std::front_insert_iterator for the container c with the type deduced from the type of the argument.

Parameters

Return value

A std::front_insert_iterator which can be used to add elements to the beginning of the container c.

Possible implementation

template< class Container >
std::front_insert_iterator<Container> front_inserter( Container& c )
{
    return std::front_insert_iterator<Container>(c);
}

Example

#include <iostream>
#include <deque>
#include <algorithm>
#include <iterator>
 
int main()
{
    std::deque<int> v{1,2,3,4,5,6,7,8,9,10};
    std::fill_n(std::front_inserter(v), 3, -1);
    for (int n : v)
        std::cout << n << ' ';
}

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See also