MeasurementHelpers.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2019-2020 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#pragma once

#include "Acts/Definitions/TrackParametrization.hpp"
#include "Acts/Utilities/Helpers.hpp"

#include <cstddef>

namespace Acts {

namespace detail {
template <size_t I>
struct visit_measurement_callable {
  template <typename L, typename A, typename B>
  auto static constexpr invoke(A&& param, B&& cov, L&& lambda) {
    return lambda(param.template head<I>(), cov.template topLeftCorner<I, I>());
  }
};
}  // namespace detail

template <typename L, typename A, typename B>
auto visit_measurement(A&& param, B&& cov, size_t dim, L&& lambda) {
  return template_switch<detail::visit_measurement_callable, 1, eBoundSize>(
      dim, param, cov, lambda);
}

template <typename L>
auto visit_measurement(size_t dim, L&& lambda) {
  return template_switch_lambda<1, eBoundSize>(dim, lambda);
}

}  // namespace Acts