Function as_string

system/lib/libcxx/src/string.cpp:293–310

template <typename S, typename P, typename V >
inline S as_string(P sprintf_like, S s, const typename S::value_type* fmt, V a) {
  typedef typename S::size_type size_type;
  size_type available = s.size();
  while (true) {
    int status = sprintf_like(&s[0], available + 1, fmt, a);
    if (status >= 0) {
      size_type used = static_cast<size_type>(status);
      if (used <= available) {
        s.resize(used);
        break;
      }
      available = used; // Assume this is advice of how much space we need.
    } else
      available = available * 2 + 1;
    s.resize(available);
  }
  return s;
}

template <class S>
struct initial_string;