char_type getUChar(BufferParams const &, pos_type pos) const;
/// pos <= size() (there is a dummy font change at the end of each par)
void setFont(pos_type pos, Font const & font);
char_type getUChar(BufferParams const &, pos_type pos) const;
/// pos <= size() (there is a dummy font change at the end of each par)
void setFont(pos_type pos, Font const & font);