Method pbackfail

analysis/TMscore.cpp:2049–2061

   */
  template <typename C, typename T>
    typename basic_pstreambuf<C,T>::int_type
    basic_pstreambuf<C,T>::pbackfail(int_type c)
    {
      if (this->gptr() != this->eback())
      {
        this->gbump(-1);
        if (!traits_type::eq_int_type(c, traits_type::eof()))
          *this->gptr() = traits_type::to_char_type(c);
        return traits_type::not_eof(c);
      }
      else
         return traits_type::eof();
    }

  template <typename C, typename T>
    std::streamsize