value.hpp

#ifndef root_value_hpp
#define root_value_hpp
#include "filval/value.hpp"
#include "TLorentzVector.h"

namespace fv::root{

class LorentzVectors : public DerivedValue<std::vector<TLorentzVector>>{
    protected:
        Value<std::vector<float>> *pt_val;
        Value<std::vector<float>> *eta_val;
        Value<std::vector<float>> *phi_val;
        Value<std::vector<float>> *mass_val;

        void update_value(){
            auto pt = pt_val->get_value();
            auto eta = eta_val->get_value();
            auto phi = phi_val->get_value();
            auto mass = mass_val->get_value();
            std::vector<int> sizes = {pt.size(), eta.size(), phi.size(), mass.size()};
            int size = *std::min_element(sizes.begin(), sizes.end());
            this->value.clear();
            TLorentzVector lv;
            for (int i =0; i<size; i++){
                lv.SetPtEtaPhiM(pt[i], eta[i], phi[i], mass[i]);
                this->value.push_back(lv);
            }
        }

    public:
        LorentzVectors(Value<std::vector<float>>* pt,
                      Value<std::vector<float>>* eta,
                      Value<std::vector<float>>* phi,
                      Value<std::vector<float>>* mass,
                      const std::string& alias)
          :DerivedValue<std::vector<TLorentzVector>>("lorentz_vectors("+pt->get_name()+","
                                                                       +eta->get_name()+","
                                                                       +phi->get_name()+","
                                                                       +mass->get_name()+")",
                                                     alias),
           pt_val(pt), eta_val(eta), phi_val(phi), mass_val(mass) { }
};

class Energies : public DerivedValue<std::vector<float>>{
    protected:
        Value<std::vector<TLorentzVector>> *vectors;
        void update_value(){
            std::vector<TLorentzVector>& vecs = vectors->get_value();
            this->value.clear();
            for (auto v : vecs){
                this->value.push_back(v.Energy());
            }
        }

    public:
        Energies(Value<std::vector<TLorentzVector>> *vectors,
                 const std::string& alias)
          :DerivedValue<std::vector<float>>("energies("+vectors->get_name()+")", alias),
           vectors(vectors) { }
};

}
#endif // root_value_hpp