Std::back_inserter (3) Linux Manual Page

std::back_inserter – std::back_inserter

Synopsis

Defined in header <iterator>

template< class Container >                                                    (until C++20)

std::back_insert_iterator<Container> back_inserter( Container& c );

template< class Container >                                                    (since C++20)

constexpr 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.

Parameters

c – container that supports a push_back operation

Return value

A std::back_insert_iterator which can be used to add elements to the end of the container c

Possible implementation

  template< class Container >
  std::back_insert_iterator<Container> back_inserter( Container& c )
  {
      return std::back_insert_iterator<Container>(c);
  }

Example

// Run this code

#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

std::back_inserter (3) Linux Manual Page