GSLMultiRootFunctionWrapper.h

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// @(#)root/mathmore:$Id$
// Authors: L. Moneta Dec 2006
 
 /**********************************************************************
  *                                                                    *
  * Copyright (c) 2004 ROOT Foundation,  CERN/PH-SFT                   *
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  * This library is free software; you can redistribute it and/or      *
  * modify it under the terms of the GNU General Public License        *
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// Header file for class GSLMultiRootFunctionWrapper
//
// Created by: moneta  at Sat Nov 13 14:54:41 2004
//
// Last update: Sat Nov 13 14:54:41 2004
//
#ifndef ROOT_Math_GSLMultiRootFunctionWrapper
#define ROOT_Math_GSLMultiRootFunctionWrapper
 
#include "gsl/gsl_multiroots.h"
 
#include "GSLMultiRootFunctionAdapter.h"
 
 
#include <cassert>
 
namespace ROOT {
namespace Math {
 
 
 
// can re-use same type for multi-fit
 
   typedef double ( * GSLMultiRootFPointer ) ( const gsl_vector *, void *, gsl_vector *);
   typedef void   ( * GSLMultiRootDfPointer )   ( const gsl_vector *, void *, gsl_matrix *);
   typedef void   ( * GSLMultiRootFdfPointer ) ( const gsl_vector *, void *, gsl_vector *, gsl_matrix *);
 
 
/**
   wrapper to a multi-dim function without  derivatives for multi roots
   algorithm
*/
class GSLMultiRootFunctionWrapper {
 
public:
 
   GSLMultiRootFunctionWrapper()
   {
      fFunc.f = nullptr;
      fFunc.n = 0;
      fFunc.params = nullptr;
   }
 
 
   /// Fill gsl function structure from a C++ function iterator and size and number of residuals
   template<class FuncVector>
   void SetFunctions(const FuncVector & f, unsigned int n ) {
      const void * p = &f;
      assert (p != nullptr);
      fFunc.f   = &GSLMultiRootFunctionAdapter<FuncVector >::F;
      fFunc.n = n;
      fFunc.params =  const_cast<void *>(p);
   }
 
   gsl_multiroot_function * GetFunctions() { return &fFunc; }
 
 
  private:
 
   gsl_multiroot_function fFunc;
 
};
 
 
/**
   wrapper to a multi-dim function with  derivatives for multi roots
   algorithm
 
   @ingroup MultiRoot
*/
 
class GSLMultiRootDerivFunctionWrapper {
 
public:
 
   GSLMultiRootDerivFunctionWrapper()
   {
      fFunc.f = nullptr;
      fFunc.df = nullptr;
      fFunc.fdf = nullptr;
      fFunc.n = 0;
      fFunc.params = nullptr;
   }
 
 
   /// Fill gsl function structure from a C++ function iterator and size and number of residuals
   template<class FuncVector>
   void SetFunctions(const FuncVector & f, unsigned int n  ) {
      const void * p = &f;
      assert (p != nullptr);
      fFunc.f   = &GSLMultiRootFunctionAdapter<FuncVector >::F;
      fFunc.df  = &GSLMultiRootFunctionAdapter<FuncVector >::Df;
      fFunc.fdf = &GSLMultiRootFunctionAdapter<FuncVector >::FDf;
      fFunc.n = n;
      fFunc.params =  const_cast<void *>(p);
   }
 
   gsl_multiroot_function_fdf * GetFunctions() { return &fFunc; }
 
 
  private:
 
   gsl_multiroot_function_fdf fFunc;
 
};
 
 
 
} // namespace Math
} // namespace ROOT
 
#endif /* ROOT_Math_GSLMultiMinFunctionWrapper */