code: def pyxlines(self):
          
          lines = ['    '+line for line in self.cleanlines]
          lines[0] = lines[0].replace('def ', 'cpdef inline void ')
          lines[0] = lines[0].replace('):', ') %s:' % _nogil)
          for name in self.untypedarguments:
              lines[0] = lines[0].replace(', %s ' % name, ', int %s ' % name)
              lines[0] = lines[0].replace(', %s)' % name, ', int %s)' % name)
          for name in self.untypedinternalvarnames:
              if name.startswith('d_'):
                  lines.insert(1, '        cdef double ' + name)
              else:
                  lines.insert(1, '        cdef int ' + name)
          return Lines(*lines)
docs: Cython code lines.
  
          Assumptions:
            * Function shall be a method
            * Method shall be inlined
            * Method returns nothing
            * Method arguments are of type `int` (except self)
            * Local variables are generally of type `int` but of type `double`
              when their name starts with `d_`