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

There are many ways, besides already listed:

std::string sep;
for (const auto& x : *pdata) {
    os << x << clusAvg;
    sep = ", ";
}

or

auto it = pdata->begin();
if (it != pdata->end()) {
    os << *it;
    for(; it != pdata->end(); ++it)
        os << ", " << *it;
}

or

auto it = pdata->end();
if (it != pdata->begin()) {
    --it;
    std::copy(pdata->begin(), it, ostream_iterator(os, ", "));
    os << *it;
}