HcalLinearCompositionFunctor.h

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#ifndef CondFormats_HcalObjects_HcalLinearCompositionFunctor_h
#define CondFormats_HcalObjects_HcalLinearCompositionFunctor_h

#include "FWCore/Utilities/interface/Exception.h"

#include "CondFormats/HcalObjects/interface/AbsHcalFunctor.h"

#include "boost/serialization/access.hpp"
#include "boost/serialization/version.hpp"
#include "boost/serialization/shared_ptr.hpp"

//
// A functor returning a linearly transformed value
// of another functor: f(x) = a*p(x) + b. Useful for
// implementing cuts symmetric about 0, etc.
//
class HcalLinearCompositionFunctor : public AbsHcalFunctor
{
public:
    // Dummy constructor, to be used for deserialization only
    inline HcalLinearCompositionFunctor() : a_(0.0), b_(0.0) {}

    // Normal constructor
    HcalLinearCompositionFunctor(boost::shared_ptr<AbsHcalFunctor> p,
                                 double a, double b);

    inline ~HcalLinearCompositionFunctor() override {}

    double operator()(double x) const override;

    inline double xmin() const override {return other_->xmin();}
    inline double xmax() const override {return other_->xmax();}

    inline double a() const {return a_;}
    inline double b() const {return b_;}

protected:
    inline bool isEqual(const AbsHcalFunctor& other) const override
    {
        const HcalLinearCompositionFunctor& r =
            static_cast<const HcalLinearCompositionFunctor&>(other);
        return *other_ == *r.other_ && a_ == r.a_ && b_ == r.b_;
    }

private:
    boost::shared_ptr<AbsHcalFunctor> other_;
    double a_;
    double b_;

    friend class boost::serialization::access;

    template<class Archive>
    inline void serialize(Archive & ar, unsigned /* version */)
    {
        boost::serialization::base_object<AbsHcalFunctor>(*this);
        // Direct polymorphic serialization of shared_ptr is broken
        // in boost for versions 1.56, 1.57, 1.58. For detail, see
        // https://svn.boost.org/trac/boost/ticket/10727
#if BOOST_VERSION < 105600 || BOOST_VERSION > 105800
        ar & other_ & a_ & b_;
#else
        throw cms::Exception("HcalLinearCompositionFunctor can not be"
                                 " serialized with this version of boost");
#endif
    }
};

BOOST_CLASS_VERSION(HcalLinearCompositionFunctor, 1)
BOOST_CLASS_EXPORT_KEY(HcalLinearCompositionFunctor)

#endif // CondFormats_HcalObjects_HcalLinearCompositionFunctor_h