std::back_inserter (3) - Linux Manuals

std::back_inserter: std::back_inserter

NAME

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