Return polynomials string-description.
String-description.
pure function description() result(string)
!< Return polynomials string-description.
character(len=:), allocatable :: string !< String-description.
#ifndef DEBUG
! error stop in pure procedure is a F2015 feature not yet supported in debug mode
error stop 'polynomials%description to be implemented by your concrete polynomials object'
#endif
endfunction description