std::experimental::ostream_joiner<DelimT,CharT,Traits>:: operator=

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C++
Experimental
Library fundamentals v2
std::experimental::ostream_joiner
template < class T >
ostream_joiner & operator = ( const T & value ) ;
(1) (library fundamentals TS v2)
ostream_joiner & operator = ( const ostream_joiner & other ) = default ;
(2) (library fundamentals TS v2)
(implicitly declared)
ostream_joiner & operator = ( ostream_joiner && other ) = default ;
(3) (library fundamentals TS v2)
(implicitly declared)
1) First, if the private "first element" flag is false , insert the delimiter delim into the output stream os associated with this iterator as if by os << delim ; .
Then, unconditionally sets the "first element" flag to false , and insert value into the output stream as if by os << value ; .
Let out_stream , delim , and first_element denote the private stream pointer, delimiter, and "first element" flag members respectively. Then this function is equivalent to 
if (!first_element)
    *out_stream << delim;
first_element = false;
*out_stream << value;
return *this;
2,3) Implicitly declared copy/move assignment operator that copy/move assigns the private stream pointer, delimiter, and "first element" flag members.

Parameters

value - the object to to be written to the stream
other - the ostream_joiner object to be assigned to this object

Return value

* this .

Example

Run this code 
#include <experimental/iterator>
#include <iostream>
 
int main()
{
    auto joiner = std::experimental::make_ostream_joiner(std::cout, ", ");
    joiner = "First";
    joiner = "do no harm.";  // prefixes with the delimiter
}

Output: 

First, do no harm.
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