#define OVERFLOW_ERROR(result) do { (result)->val = GSL_POSINF; (result)->err = GSL_POSINF; GSL_ERROR ("overflow", GSL_EOVRFLW); } while(0)

#define UNDERFLOW_ERROR(result) do { (result)->val = 0.0; (result)->err = GSL_DBL_MIN; GSL_ERROR ("underflow", GSL_EUNDRFLW); } while(0)

#define INTERNAL_OVERFLOW_ERROR(result) do { (result)->val = GSL_POSINF; (result)->err = GSL_POSINF; return GSL_EOVRFLW; } while(0)

#define INTERNAL_UNDERFLOW_ERROR(result) do { (result)->val = 0.0; (result)->err = GSL_DBL_MIN; return GSL_EUNDRFLW; } while(0)

#define DOMAIN_ERROR(result) do { (result)->val = GSL_NAN; (result)->err = GSL_NAN; GSL_ERROR ("domain error", GSL_EDOM); } while(0)

#define DOMAIN_ERROR_MSG(msg, result) do { (result)->val = GSL_NAN; (result)->err = GSL_NAN; GSL_ERROR ((msg), GSL_EDOM); } while(0)

#define DOMAIN_ERROR_E10(result) do { (result)->val = GSL_NAN; (result)->err = GSL_NAN; (result)->e10 = 0 ; GSL_ERROR ("domain error", GSL_EDOM); } while(0)

#define OVERFLOW_ERROR_E10(result) do { (result)->val = GSL_POSINF; (result)->err = GSL_POSINF; (result)->e10 = 0; GSL_ERROR ("overflow", GSL_EOVRFLW); } while(0)
#define UNDERFLOW_ERROR_E10(result) do { (result)->val = 0.0; (result)->err = GSL_DBL_MIN; (result)->e10 = 0; GSL_ERROR ("underflow", GSL_EUNDRFLW); } while(0)


#define OVERFLOW_ERROR_2(r1,r2) do { (r1)->val = GSL_POSINF; (r1)->err = GSL_POSINF; (r2)->val = GSL_POSINF ; (r2)->err=GSL_POSINF; GSL_ERROR ("overflow", GSL_EOVRFLW); } while(0)

#define UNDERFLOW_ERROR_2(r1,r2) do { (r1)->val = 0.0; (r1)->err = GSL_DBL_MIN; (r2)->val = 0.0 ; (r2)->err = GSL_DBL_MIN; GSL_ERROR ("underflow", GSL_EUNDRFLW); } while(0)

#define DOMAIN_ERROR_2(r1,r2) do { (r1)->val = GSL_NAN; (r1)->err = GSL_NAN;  (r2)->val = GSL_NAN; (r2)->err = GSL_NAN;  GSL_ERROR ("domain error", GSL_EDOM); } while(0)

#define MAXITER_ERROR(result) do { (result)->val = GSL_NAN; (result)->err = GSL_NAN; GSL_ERROR ("too many iterations error", GSL_EMAXITER); } while(0)