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

As you observed, copying via std::copy doesn't do the trick, one additional , is output. There is a proposal that will probably make it in the future C++17 standard: ostream_joiner, which will do exactly what you expect.

However, a quick solution available now is to do it manually.

for(auto it = std::begin(*pdata); it != std::end(*pdata); ++it)
{
    if (it != std::begin(*pdata))
        std::cout << ",";
    std::cout << *it;
}