NAME

std::front_inserter - std::front_inserter

Synopsis

Defined in header <iterator>
template< class Container > (until C++20)
std::front_insert_iterator<Container> front_inserter( Container& c );
template< class Container >
constexpr std::front_insert_iterator<Container> front_inserter( (since C++20)
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

c - container that supports a push_front operation

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

// Run this code

#include <vector>
#include <deque>
#include <iostream>
#include <iterator>
#include <algorithm>
int main()
{
std::vector<int> v{1,2,3,4,5};
std::deque<int> d;
std::copy(v.begin(), v.end(), std::front_inserter(d));
for(int n : d)
std::cout << n << ' ';
}

Output:

5 4 3 2 1

See also

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