std::experimental:: make_ostream_joiner

From cppreference.com
C++
Experimental
Library fundamentals v2
std::experimental::ostream_joiner
Defined in header <experimental/iterator>
template < class CharT, class Traits, class DelimT >

std:: experimental :: ostream_joiner < std:: decay_t < DelimT > , CharT, Traits >
make_ostream_joiner ( std:: basic_ostream < CharT, Traits > & os,

DelimT && delimiter ) ;
(library fundamentals TS v2)

Creates an ostream_joiner object, deducing the template arguments from the types of the function arguments.

Parameters

os - the basic_ostream object that the iterator is to be associated to
delimiter - the delimiter

Return value

An ostream_joiner object, created as if by std:: experimental :: ostream_joiner < std:: decay_t < DelimT > , CharT, Traits > ( os, std:: forward < DelimT > ( delimiter ) )

Example

Run this code 
#include <experimental/iterator>
#include <iostream>
#include <vector>
 
int main()
{
    std::vector<int> x{1, 2, 3, 4};
    std::copy(x.begin(), x.end(),
              std::experimental::make_ostream_joiner(std::cout, ", "));
}

Output: 

1, 2, 3, 4
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