Function JoinRange

util/string/join.h:115–133

namespace NPrivate {
    template <typename TCharType, typename TIter>
    inline TBasicString<TCharType> JoinRange(TBasicStringBuf<TCharType> delim, const TIter beg, const TIter end) {
        TBasicString<TCharType> out;
        if (beg != end) {
            size_t total = ::NPrivate::GetLength(*beg);
            for (TIter pos = beg; ++pos != end;) {
                total += delim.length() + ::NPrivate::GetLength(*pos);
            }
            if (total > 0) {
                out.reserve(total);
            }

            AppendToString(out, *beg);
            for (TIter pos = beg; ++pos != end;) {
                AppendJoinNoReserve(out, delim, *pos);
            }
        }

        return out;
    }

} // namespace NPrivate