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std::back_inserter(3)	       C++ Standard Libary	   std::back_inserter(3)

NAME
     std::back_inserter - std::back_inserter

Synopsis
	Defined in header <iterator>
	template<		 class		      Container 	       >
     (constexpr since
	std::back_insert_iterator<Container>   back_inserter(	 Container&    c
     C++20)
	);

	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 <algorithm>
      #include <iostream>
      #include <iterator>
      #include <vector>

      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 << ' ';
	  std::cout << '\n';
      }

Output:
      1 2 3 4 5 6 7 8 9 10 -1 -1 -1

See also
	back_insert_iterator iterator adaptor for insertion at the end of a con-
     tainer
			     (class template)
			     creates  a  std::front_insert_iterator  of type in-
     ferred from the
	front_inserter	     argument
			     (function template)
			     creates a	std::insert_iterator  of  type	inferred
     from the
	inserter	     argument
			     (function template)

http://cppreference.com 	   2024.06.10		   std::back_inserter(3)
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