JugReco/JugReco/Measurement.hpp

0001 // Copyright (C) 2020 CERN for the benefit of the Acts project
0002 //
0003 // This Source Code Form is subject to the terms of the Mozilla Public
0004 // License, v. 2.0. If a copy of the MPL was not distributed with this
0005 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
0006
0007 #pragma once
0008
0009 #include "Acts/EventData/Measurement.hpp"
0010 #include "JugReco/IndexSourceLink.hpp"
0011
0012 #include <cassert>
0013 #include <vector>
0014
0015 namespace Jug {
0016
0017   /// Variable measurement type that can contain all possible combinations.
0018   using Measurement = ::Acts::BoundVariantMeasurement<IndexSourceLink>;
0019   /// Container of measurements.
0020   ///
0021   /// In contrast to the source links, the measurements themself must not be
0022   /// orderable. The source links stored in the measurements are treated
0023   /// as opaque here and no ordering is enforced on the stored measurements.
0024   using MeasurementContainer = std::vector<Measurement>;
0025
0026   /// Calibrator to convert an index source link to a measurement.
0027   class MeasurementCalibrator {
0028   public:
0029     /// Construct an invalid calibrator. Required to allow copying.
0030     MeasurementCalibrator() = default;
0031     /// Construct using a user-provided container to chose measurements from.
0032     MeasurementCalibrator(const MeasurementContainer& measurements) : m_measurements(&measurements) {}
0033
0034     /// Find the measurement corresponding to the source link.
0035     ///
0036     /// @tparam parameters_t Track parameters type
0037     /// @param sourceLink Input source link
0038     /// @param parameters Input track parameters (unused)
0039     template <typename parameters_t>
0040     const Measurement& operator()(const IndexSourceLink& sourceLink, const parameters_t& /* parameters */) const
0041     {
0042       assert(m_measurements and "Undefined measurement container in DigitizedCalibrator");
0043       assert((sourceLink.index() < m_measurements->size()) and "Source link index is outside the container bounds");
0044       return (*m_measurements)[sourceLink.m_index];
0045     }
0046
0047   private:
0048     // use pointer so the calibrator is copyable and default constructible.
0049     const MeasurementContainer* m_measurements = nullptr;
0050   };
0051
0052 } // namespace Jug