Remove trailing comma in CSV file written for a vector using copy and ostream_iterator

Question

I have the following function, which writes a vector to a CSV file:

#include 
#include 
#include 
#include         


        

Answer 1

I'd omit printing the comma by treating the first element special:

if (!pdata->empty()) {
    os << pdata->front();
    std::for_each(std::next(pdata->begin()), pdata->end(),
                  [&os](auto&& v){ os << ", " << v; });
}

Obviously, this code goes into a function printing a printable range adapter.