Re: [Help-gsl] gsl_multifit_function_fdf callbacks in C++

[eknecronzontas]

This won't work, as normal function pointers cannot hold pointers to member 
functions. You'll have to either declare the member function as static, as you 
suggest, or write a global function wrapper. I should point out also that, in 
the example below, the function callback_df has to have the same argument list 
as a gsl_multifit function (did you just omit the arguments for clarity?), and 
that a multifit function may be different from a multimin function. Of course 
you could also use my c++ library (wink wink - 
http://tharkad.pa.msu.edu/~asteiner/hal/html/index.html)
Take care,
Andrew

----- Original Message ----
From: Pedro Figueiredo Santana <address@hidden>
To: address@hidden
Sent: Wednesday, May 23, 2007 7:19:54 PM
Subject: [Help-gsl] gsl_multifit_function_fdf callbacks in C++

Hi!

I'm using 'gsl_multifit_function_fdf' for a nonlinear minimisation
problem in C++. I would like to have the callback functions as members
of the class as shown below:  

int MyClass::callback_df{
  ...
}

void MyClass::method1{
  ...
  gsl_multifit_function_fdf f;
  f.df = &MyClass::callback_df;
  ...
}

However, the g++ compiler says that it is not possible to convert the
method into the required callback type. Does anyone knows the best way
to do this? I've also tried to make the callback method static and
didn't help that much ...

Thanks,
Pedro Santana



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