remove char from stringstream and append some data

Question

In my code there is a loop that adds sth like that \"number,\" to stringstream. When it ends, I need to extract \',\' add \'}\' and add \'{\' if the loop is to repeated.

Answer 1

Have fun with std::copy, iterators and traits. You either have to assume that your data is reverse iterable (end - 1) or that your output can be rewinded. I choose it was easier to rewind.

#include 
#include 
#include 

namespace My
{
  template
  void print(std::ostream &out, Iterator begin, Iterator end)
  {
    out << '{';
    if (begin != end) {
      Iterator last = end - 1;
      if (begin != last) {
        std::copy(begin, last, std::ostream_iterator< typename std::iterator_traits::value_type  >(out, ", "));
      }
      out << *last;
    }
    out << '}';
  }
}

#include 

int main(int argc, char** argv)
{
  My::print(std::cout, &argv[0], &argv[argc]);
  std::cout << '\n';
}