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Formatting a Comma Delimated List Redux

Sun, 2009-03-08 14:14 — jason

A few weeks back, I posited the question, "What is the best way to format a comma delimited list?"

After seeing all of the succinct ways to accomplish this in other languages, I got a little jealous and decided to write this C++ algorithm which acts about the same.

I feel like there must be a c++ standard library way of doing this that I'm some how overlooking.

template <typename InItr>
std::string join(InItr begin, InItr end, const std::string &joiner)
{
  std::string ret;
 
  while (begin != end)
  {
    std::stringstream ss;
    ss << *begin;
    ret += ss.str();
    ++begin;    
    if (begin != end)
    {
      ret += joiner;
    }
  }
 
  return ret;
}

Usage:

//With an array:
int vals[] = {1,17,9};
std::cout << join(&vals[0], &vals[sizeof(vals)/sizeof(int)], ", ") << std::endl;
 
//With a vector:
std::vector<int> vec;
vec.push_back(1);
vec.push_back(17);
vec.push_back(9);
std::cout << join(vec.begin(), vec.end(), ",") << std::endl;

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