Core/Utilities/ZipTests.cpp

0001 // This file is part of the ACTS project.
0002 //
0003 // Copyright (C) 2016 CERN for the benefit of the ACTS project
0004 //
0005 // This Source Code Form is subject to the terms of the Mozilla Public
0006 // License, v. 2.0. If a copy of the MPL was not distributed with this
0007 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
0008
0009 #include <boost/test/unit_test.hpp>
0010
0011 #include <Acts/Utilities/Zip.hpp>
0012
0013 #include <array>
0014 #include <string>
0015 #include <vector>
0016
0017 const std::vector<int> vec = {1, 2, 3, 4};
0018 const std::array<double, 4> arr = {2.0, 4.0, 6.0, 8.0};
0019 const std::string str = "abcd";
0020
0021 BOOST_AUTO_TEST_CASE(test_access) {
0022   int i = 0;
0023   for (const auto &[a, b, c] : Acts::zip(vec, arr, str)) {
0024     BOOST_CHECK_EQUAL(a, vec[i]);
0025     BOOST_CHECK_EQUAL(b, arr[i]);
0026     BOOST_CHECK_EQUAL(c, str[i]);
0027     ++i;
0028   }
0029 }
0030
0031 BOOST_AUTO_TEST_CASE(test_mutation) {
0032   std::vector<int> vec2 = vec;
0033   std::array<double, 4> arr2 = arr;
0034   std::string str2 = str;
0035
0036   for (auto [a, b, c] : Acts::zip(vec2, arr2, str2)) {
0037     a *= 2;
0038     b *= 2;
0039     c = 'e';
0040   }
0041
0042   for (int i = 0; i < 4; ++i) {
0043     BOOST_CHECK_EQUAL(vec2[i], 2 * vec[i]);
0044     BOOST_CHECK_EQUAL(arr2[i], 2 * arr[i]);
0045   }
0046
0047   BOOST_CHECK_EQUAL(str2, "eeee");
0048 }