Method insert

3rdparty/yasio/yasio/string.hpp:127–155

  }
  template <typename _Iter, ::yasio::enable_if_t<::yasio::is_iterator<_Iter>::value, int> = 0>
  iterator insert(iterator _Where, _Iter first, _Iter last)
  {
    auto _Mylast = _Myfirst + _Mysize;
    _YASIO_VERIFY_RANGE(_Where >= _Myfirst && _Where <= _Mylast && first <= last, "basic_string: out of range!");
    if (first != last)
    {
      auto insertion_pos = static_cast<size_type>(std::distance(_Myfirst, _Where));
      if (_Where == _Mylast)
        append(first, last);
      else
      {
        auto ifirst = std::addressof(*first);
        static_assert(sizeof(*ifirst) == sizeof(value_type), "basic_string: iterator type incompatible!");
        auto count = static_cast<size_type>(std::distance(first, last));
        if (insertion_pos >= 0)
        {
          auto old_size = _Mylast - _Myfirst;
          expand(count);
          _Where       = _Myfirst + insertion_pos;
          _Mylast      = _Myfirst + _Mysize;
          auto move_to = _Where + count;
          std::copy_n(_Where, _Mylast - move_to, move_to);
          std::copy_n((iterator)ifirst, count, _Where);
        }
      }
      return _Myfirst + insertion_pos;
    }
    return _Where;
  }
  iterator insert(iterator _Where, size_type count, const_reference val)
  {
    auto _Mylast = _Myfirst + _Mysize;