std::front_inserter (3) Linux Manual Page

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 >                                                      (since C++20)

constexpr 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

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

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