Function commify

src/utils/commify.cpp:34–52

namespace utils {

std::string commify(size_t n)
{
  std::string s = std::to_string(n);
  std::stringstream s2;
  int c = 0;
  for (int j = (int)s.size() - 1; j >= 0; j--) {
    s2 << s[j];
    ++c;
    if (c == 3) {
      if (j > 0) {
        s2 << ",";
        c = 0;
      }
    }
  }
  std::string r = s2.str();
  std::reverse(r.begin(), r.end());
  return r;
}

} // namespace utils
} // namespace lbann