/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/PhysicsTools/Utilities/interface/RootFunctionAdapter.h

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#ifndef PhysicTools_Utilities_RootFunctionAdapter_h
#define PhysicTools_Utilities_RootFunctionAdapter_h
#include <vector>
#include <boost/shared_ptr.hpp>
#include "PhysicsTools/Utilities/interface/RootVarsAdapter.h"

namespace root {
  namespace helper {

    template<typename F, unsigned int args>
    struct RootFunctionAdapter {
      RootFunctionAdapter() : f_(0) { }
      RootFunctionAdapter(F & f) : f_(&f) { }
      void addParameter(const boost::shared_ptr<double> & par) {
        pars_.push_back(par);
      }
      void setParameters(const double * pars) {
        for(size_t i = 0; i < pars_.size(); ++i) {
          *pars_[i] = pars[i];
        }
      }
      double operator()(const double * var) const {
        return RootVarsAdapter<F, args>::value(*f_, var);
      }
      size_t numberOfParameters() const {
        return pars_.size();
      }
    private:
      F * f_;
      std::vector<boost::shared_ptr<double> > pars_;
    };
    
  }

}

#endif