C++ std::copy_n with std::list














































C++ std::copy_n with std::list



Description:
This C++ article is about the copy_n() algorithm function with std::vector container. 
It is an STL algorithm in <algorithm> header file.It gives the freedom to choose how many 
elements have to be copied in destination container
   
copy_n() has one definition:
   template <class InputIterator, class Size, class OutputIterator>
  OutputIterator copy_n (InputIterator first, Size n, OutputIterator result);

Return type : An iterator to the end of the destination range where elements have been copied.

Working: The copy_n( ) function takes 3 parameters, two iterators 'first' ,n  , result .
                   first : The pointer to the beginning of source container, from where elements have to be 
                   started copying.
                   n:Integer specifying how many numbers would be copied to destination container starting 
                   from n.If a negative number is entered, no operation is performed.
                   result:The pointer to the beginning of destination container, to where elements have to
                   be started copying.
Implementation: 

#include<iostream>
#include<algorithm> // copy_n()
#include<list>

int main()
{

   std::list<int> lis = {1,2,3,4,5,6,7,8,9,10};
   std::list<int> lis_size (lis.size());

   // using copy_n()
    auto it = copy_n(lis.begin(), 5 , lis_size.begin());
    lis_size.resize(std::distance(lis_size.begin(),it));

   // printing new list
   std::cout << "element contains:";
   for (int& x: lis_size) std::cout << ' ' << x;
   std::cout << '\n';

}

Output:
element contains: 1 2 3 4 5


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