GSLMonteFunctionAdapter.h

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// @(#)root/mathmore:$Id$
// Authors: L. Moneta, 08/2007
 
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  * Copyright (c) 2004 ROOT Foundation,  CERN/PH-SFT                   *
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// Header file for class GSLMultiMinFunctionAdapter
//
// Generic adapter for gsl_multimin_function signature
// usable for any c++ class which defines operator( )
//
// Created by: Lorenzo Moneta  at Fri Nov 12 16:58:51 2004
//
// Last update: Fri Nov 12 16:58:51 2004
//
#ifndef ROOT_Math_GSLMonteFunctionAdapter
#define ROOT_Math_GSLMonteFunctionAdapter
 
 
namespace ROOT {
namespace Math {
 
 
  /**
     Class for adapting any multi-dimension C++ functor class to C function pointers used by
     GSL MonteCarlo integration algorithms.
     The templated C++ function class must implement:
 
    <em> double operator( const double *  x)</em>
 
    This class defines static methods with will be used to fill the
    \a gsl_monte_function  used by GSL.
    See for examples the
    <A HREF="http://www.gnu.org/software/gsl/manual/html_node/Monte-Carlo-Interface.html">GSL online manual</A>
 
    @ingroup MCIntegration
  */
 typedef double ( * GSLMonteFuncPointer ) ( double *, size_t, void *);
 
  template<class UserFunc>
  struct  GSLMonteFunctionAdapter {
 
    static double F( double * x, size_t, void * p) {
 
      UserFunc * function = reinterpret_cast< UserFunc *> (p);
      return (*function)( x );
    }
 
  };
 
 
 
} // namespace Math
} // namespace ROOT
 
 
#endif /* ROOT_Math_GSLMonteFunctionAdapter */