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75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
// Boost.Geometry
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// Unit Test
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// Copyright (c) 2024 Barend Gehrels, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <string>
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#include <vector>
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#include <boost/geometry/views/enumerate_view.hpp>
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#include <boost/test/included/test_exec_monitor.hpp>
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void test_const()
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{
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const std::vector<std::string> vec{"cat", "mouse", "squirrel"};
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std::size_t test_index = 0;
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for (auto const& item : boost::geometry::util::enumerate(vec))
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{
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BOOST_CHECK_EQUAL(item.index, test_index++);
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switch(item.index)
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{
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case 0 : BOOST_CHECK_EQUAL(item.value, "cat"); break;
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case 1 : BOOST_CHECK_EQUAL(item.value, "mouse"); break;
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case 2 : BOOST_CHECK_EQUAL(item.value, "squirrel"); break;
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}
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}
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}
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void test_non_const()
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{
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std::vector<std::string> vec{"Amsterdam", "London", "Paris"};
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std::size_t index_sum = 0;
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for (auto const& item : boost::geometry::util::enumerate(vec))
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{
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item.value += " is a city";
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index_sum += item.index;
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}
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BOOST_CHECK_EQUAL(vec[0], "Amsterdam is a city");
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BOOST_CHECK_EQUAL(vec[1], "London is a city");
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BOOST_CHECK_EQUAL(vec[2], "Paris is a city");
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BOOST_CHECK_EQUAL(index_sum, 3);
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}
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// Verifies the usage of the enumerate_view with C++17 structured bindings
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// See https://en.cppreference.com/w/cpp/ranges/enumerate_view
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void test_cpp17()
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{
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#if __cplusplus >= 201703L
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std::vector<int> numbers{1, 3, 5, 7};
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std::size_t sum_indexes = 0;
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int sum_numbers = 0;
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for (auto const [index, num] : boost::geometry::util::enumerate(numbers))
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{
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sum_indexes += index;
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sum_numbers += num;
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// num is mutable even with const, which does not propagate to reference
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num++;
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}
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BOOST_CHECK_EQUAL(sum_indexes, 6);
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BOOST_CHECK_EQUAL(sum_numbers, 16);
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BOOST_CHECK_EQUAL(numbers[0], 2);
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#endif
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}
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int test_main(int, char* [])
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{
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test_const();
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test_non_const();
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test_cpp17();
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return 0;
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}
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