* Make zeta1_eval() more lightweight by copying less stuff.

diff --git a/ginac/inifcns_zeta.cpp b/ginac/inifcns_zeta.cpp
index 287059835180a06dea6a2763b5d77ae11074cda3..a7b956ae71764ee870844b23a24e66e8cfe9df9e 100644 (file)
--- a/ginac/inifcns_zeta.cpp
+++ b/ginac/inifcns_zeta.cpp
@@ -50,27 +50,27 @@ static ex zeta1_evalf(const ex & x)
 static ex zeta1_eval(const ex & x)
 {
        if (x.info(info_flags::numeric)) {
-               numeric y = ex_to<numeric>(x);
+               const numeric &y = ex_to<numeric>(x);
                // trap integer arguments:
                if (y.is_integer()) {
                        if (y.is_zero())
                                return _ex_1_2;
-                       if (x.is_equal(_ex1))
+                       if (y.is_equal(_num1))
                                throw(std::domain_error("zeta(1): infinity"));
-                       if (x.info(info_flags::posint)) {
-                               if (x.info(info_flags::odd))
+                       if (y.info(info_flags::posint)) {
+                               if (y.info(info_flags::odd))
                                        return zeta(x).hold();
                                else
-                                       return abs(bernoulli(y))*pow(Pi,x)*pow(_num2,y-_num1)/factorial(y);
+                                       return abs(bernoulli(y))*pow(Pi,y)*pow(_num2,y-_num1)/factorial(y);
                        } else {
-                               if (x.info(info_flags::odd))
+                               if (y.info(info_flags::odd))
                                        return -bernoulli(_num1-y)/(_num1-y);
                                else
-                                       return _num0;
+                                       return _ex0;
                        }
                }
                // zeta(float)
-               if (x.info(info_flags::numeric) && !x.info(info_flags::crational))
+               if (y.info(info_flags::numeric) && !y.info(info_flags::crational))
                        return zeta1_evalf(x);
        }
        return zeta(x).hold();