Tutorial: how to create noncommutative symbols?

[ginac.git] / ginac / function.cppy

diff --git a/ginac/function.cppy b/ginac/function.cppy
index fb1d879192a4b0e1a42712f4776d5a730b1b0ca4..0876f9cf955bfabe56154554c96eaef0b6e31f12 100644 (file)
--- a/ginac/function.cppy
+++ b/ginac/function.cppy
@@ -34,7 +34,6 @@
 #include "power.h"
 #include "archive.h"
 #include "inifcns.h"
-#include "tostring.h"
 #include "utils.h"
 #include "hash_seed.h"
 #include "remember.h"
@@ -79,7 +78,7 @@ void function_options::initialize()
        set_name("unnamed_function", "\\\\mbox{unnamed}");
        nparams = 0;
        eval_f = evalf_f = real_part_f = imag_part_f = conjugate_f = expand_f
-               = derivative_f = expl_derivative_f = power_f = series_f = 0;
+               = derivative_f = expl_derivative_f = power_f = series_f = nullptr;
        info_f = 0;
        evalf_params_first = true;
        use_return_type = false;
@@ -386,7 +385,7 @@ ex function::eval(int level) const
                }
        }
 
-       if (opt.eval_f==0) {
+       if (opt.eval_f==nullptr) {
                return this->hold();
        }
 
@@ -878,7 +877,7 @@ unsigned function::find_function(const std::string &name, unsigned nparams)
                        return serial;
                ++serial;
        }
-       throw (std::runtime_error("no function '" + name + "' with " + ToString(nparams) + " parameters defined"));
+       throw (std::runtime_error("no function '" + name + "' with " + std::to_string(nparams) + " parameters defined"));
 }
 
 /** Return the print name of the function. */