TupleIndexOfTests.cpp

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// This file is part of the Acts project.
//
// Copyright (C) 2021 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/.

#include <boost/test/unit_test.hpp>

#include "ActsFatras/Kernel/InteractionList.hpp"

#include <tuple>

namespace ActsFatras {
namespace detail {
template <class T, class Tuple>
struct TupleIndexOf;
}  // namespace detail
}  // namespace ActsFatras

using ActsFatras::detail::TupleIndexOf;

BOOST_AUTO_TEST_SUITE(FatrasTupleIndexOf)

BOOST_AUTO_TEST_CASE(Regular) {
  using T = std::tuple<int, double, float>;

  BOOST_CHECK_EQUAL((TupleIndexOf<int, T>::value), 0u);
  BOOST_CHECK_EQUAL((TupleIndexOf<double, T>::value), 1u);
  BOOST_CHECK_EQUAL((TupleIndexOf<float, T>::value), 2u);
}

BOOST_AUTO_TEST_CASE(Duplicates) {
  using T = std::tuple<double, int, double>;

  // should return the first matching type
  BOOST_CHECK_EQUAL((TupleIndexOf<double, T>::value), 0u);
  BOOST_CHECK_EQUAL((TupleIndexOf<int, T>::value), 1u);
}

BOOST_AUTO_TEST_SUITE_END()