upstream_tagger_histogrammer.hpp

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// SPDX-FileCopyrightText: 2026 CERN for the benefit of the SHiP Collaboration
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
// upstream_tagger_histogrammer.hpp — Upstream Tagger validation histograms.
// A placeholder for the UBT experts to fill in: so far only the per-event hit
// multiplicity, which comes from the shared MultiplicityHistogrammer. Book
// UBT-specific histograms in the constructor and fill them in observe(); once
// there are enough of them, drop the base class and keep only this file (see
// SpectrometerHistogrammer for how that ends up looking).
 
#pragma once
 
#include "HistoFileService.hpp"
#include "detectors/multiplicity_histogrammer.hpp"
 
#include <SHiP/detectors/UBTHit.hpp>
#include <memory>
#include <utility>
#include <vector>
 
namespace SHiP::trout {
 
class UpstreamTaggerHistogrammer : public MultiplicityHistogrammer<SHiP::UBTHit> {
   public:
    explicit UpstreamTaggerHistogrammer(std::shared_ptr<HistoFileService> file_service)
        : MultiplicityHistogrammer{std::move(file_service), "h_upstream_tagger_multiplicity",
                                   "Upstream tagger hits per event;N;Events"} {}
 
    // Deliberately not inherited: phlex deduces the bound object type and the
    // member pointer's class in one go (see delegate() in
    // phlex/metaprogramming/delegate.hpp), so &UpstreamTaggerHistogrammer::observe
    // has to name a member of this class. Convenient, since this is also where
    // the UBT-specific fills belong.
    void observe(std::vector<SHiP::UBTHit> const& hits) { MultiplicityHistogrammer::observe(hits); }
};
 
}  // namespace SHiP::trout