Problem with using a general c++ member function in a TF1

[jjc385]

Hello,

I am trying to create a TF1 using a member function of a general c++ class, as specified here: http://root.cern.ch/root/html/TF1.html#F5

The documentation (see link above) claims that

A TF1 can be created in this case from any member function of a class which has the signature of (double * , double *) and returning a double.

However, when I attempt to do this

[code]#include “TF1.h”

class Simple {

public:
double Evaluate(double* x, double* p) {
return 0;
}
};

void simple_func() {
Simple s;
TF1* ff=new TF1(“ff”,s,&Simple::Evaluate,0,1,0,“Simple”,“Evaluate”);
}[/code]

it gives the following compile errors:

root [5] .x simple_func.C++ Info in <TUnixSystem::ACLiC>: creating shared library /nfs/user/jjc385/met_project/aleko_code/metsig/./simple_func_C.so In file included from /nfs/user/jjc385/met_project/aleko_code/metsig/simple_func_C_ACLiC_dict.h:34, from /nfs/user/jjc385/met_project/aleko_code/metsig/simple_func_C_ACLiC_dict.cxx:17: /nfs/user/jjc385/met_project/aleko_code/metsig/./simple_func.C:6: warning: unused parameter âxâ /nfs/user/jjc385/met_project/aleko_code/metsig/./simple_func.C:6: warning: unused parameter âpâ /nfs/user/jjc385/met_project/aleko_code/metsig/./simple_func.C: In function âvoid simple_func()â: /nfs/user/jjc385/met_project/aleko_code/metsig/./simple_func.C:14: warning: unused variable âffâ In file included from /cdat/tem/jjc385/root/root_build2//include/root/TF1.h:40, from /nfs/user/jjc385/met_project/aleko_code/metsig/./simple_func.C:1, from /nfs/user/jjc385/met_project/aleko_code/metsig/simple_func_C_ACLiC_dict.h:34, from /nfs/user/jjc385/met_project/aleko_code/metsig/simple_func_C_ACLiC_dict.cxx:17: /cdat/tem/jjc385/root/root_build2//include/root/Math/ParamFunctor.h: In member function âdouble ROOT::Math::ParamMemFunHandler<ParentFunctor, PointerToObj, PointerToMemFn>::operator()(double*, double*) [with ParentFunctor = ROOT::Math::ParamFunctor, PointerToObj = Simple, PointerToMemFn = double (Simple::*)(double*, double*)]â: /nfs/user/jjc385/met_project/aleko_code/metsig/simple_func_C_ACLiC_dict.cxx:524: instantiated from here /cdat/tem/jjc385/root/root_build2//include/root/Math/ParamFunctor.h:175: error: no match for âoperator*â in â*((ROOT::Math::ParamMemFunHandler<ROOT::Math::ParamFunctor, Simple, double (Simple::*)(double*, double*)>*)this)->ROOT::Math::ParamMemFunHandler<ROOT::Math::ParamFunctor, Simple, double (Simple::*)(double*, double*)>::fObjâ g++: /nfs/user/jjc385/met_project/aleko_code/metsig/simple_func_C_ACLiC_dict.o: No such file or directory Error in <ACLiC>: Compilation failed! Error: Function simple_func() is not defined in current scope :0: *** Interpreter error recovered ***

I don’t understand why it’s looking for Simple::operator*.

I’m using ROOT Version 5.34.09, on a 64-bit SL6 system.

Thanks,
-Jared

[Wile_E_Coyote]

Simple *s = new Simple();