#include <iostream>
#include <forward_list>


int main()
{
  std::forward_list<int> a = {1,2,3,4,5,6};

  std::forward_list<int> b;

  while( !a.empty() )
    b.splice_after(b.before_begin(), a, a.before_begin());

  for( auto i : b )
  {
    std::cout << i << std::endl;
  }
  std::cout << "---------" << std::endl;
  for( auto i : a )
  {
    std::cout << i << std::endl;
  }
  std::cout << "---------" << std::endl;
  return 0;
}


/*
std::forward_list::splice_after
void splice_after (const_iterator position, forward_list& fwdlst);  //for entire list
void splice_after (const_iterator position, forward_list& fwdlst, const_iterator i);  //for single elemnt ,Iterator to an element in fwdlst preceding the one to be transferred.
void splice_after (const_iterator position, forward_list& fwdlst, const_iterator first, const_iterator last);  //element range  The function transfers the elements in open interval  range (first,last) to position.


Transfer elements from another forward_list
Transfers elements from fwdlst into the container inserting them after the element pointed by position.

This effectively inserts those elements into the container and removes them from fwdlst, altering the sizes of both containers. The operation does not involve the construction or destruction of any element. They are transferred, no matter whether fwdlst is an lvalue or an rvalue, or whether the value_type supports move-construction or not.

*/