| // Copyright Neil Groves 2009. Use, modification and |
| // distribution is subject to the Boost Software License, Version |
| // 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| // |
| // |
| // For more information, see http://www.boost.org/libs/range/ |
| // |
| #include <boost/range/algorithm/nth_element.hpp> |
| |
| #include <boost/test/test_tools.hpp> |
| #include <boost/test/unit_test.hpp> |
| |
| #include <boost/assign.hpp> |
| #include <boost/bind.hpp> |
| #include <algorithm> |
| #include <functional> |
| #include <list> |
| #include <numeric> |
| #include <deque> |
| #include <vector> |
| |
| namespace boost |
| { |
| namespace |
| { |
| struct nth_element_policy |
| { |
| template<class Container, class Iterator> |
| void test_nth_element(Container& cont, Iterator mid) |
| { |
| const Container old_cont(cont); |
| |
| boost::nth_element(cont, mid); |
| |
| // Test the same operation on the container, for the |
| // case where a temporary is passed as the first |
| // argument. |
| Container cont2(old_cont); |
| const std::size_t index = std::distance(cont.begin(), mid); |
| Iterator mid2(cont2.begin()); |
| std::advance(mid2, index); |
| boost::nth_element(boost::make_iterator_range(cont2), mid2); |
| |
| BOOST_CHECK_EQUAL_COLLECTIONS( cont.begin(), cont.end(), |
| cont2.begin(), cont2.end() ); |
| } |
| |
| template<class Container, class Iterator> |
| void reference_nth_element(Container& cont, Iterator mid) |
| { |
| std::nth_element(cont.begin(), mid, cont.end()); |
| } |
| }; |
| |
| template<class BinaryPredicate> |
| struct nth_element_pred_policy |
| { |
| template<class Container, class Iterator> |
| void test_nth_element(Container& cont, Iterator mid) |
| { |
| const Container old_cont(cont); |
| |
| boost::nth_element(cont, mid, BinaryPredicate()); |
| |
| Container cont2(old_cont); |
| const std::size_t index = std::distance(cont.begin(), mid); |
| Iterator mid2(cont2.begin()); |
| std::advance(mid2, index); |
| boost::nth_element(boost::make_iterator_range(cont2), mid2, |
| BinaryPredicate()); |
| |
| BOOST_CHECK_EQUAL_COLLECTIONS( cont.begin(), cont.end(), |
| cont2.begin(), cont2.end() ); |
| } |
| |
| template<class Container, class Iterator> |
| void reference_nth_element(Container& cont, Iterator mid) |
| { |
| std::nth_element(cont.begin(), mid, cont.end(), BinaryPredicate()); |
| } |
| }; |
| |
| template<class Container, class TestPolicy> |
| void test_nth_element_tp_impl(Container& cont, TestPolicy policy) |
| { |
| Container reference(cont); |
| Container test(cont); |
| |
| typedef BOOST_DEDUCED_TYPENAME range_iterator<Container>::type iterator_t; |
| |
| BOOST_CHECK_EQUAL( reference.size(), test.size() ); |
| if (reference.size() != test.size()) |
| return; |
| |
| iterator_t reference_mid = reference.begin(); |
| iterator_t test_mid = test.begin(); |
| |
| bool complete = false; |
| while (!complete) |
| { |
| if (reference_mid == reference.end()) |
| complete = true; |
| |
| policy.test_nth_element(test, test_mid); |
| policy.reference_nth_element(reference, reference_mid); |
| |
| BOOST_CHECK_EQUAL_COLLECTIONS( |
| reference.begin(), reference.end(), |
| test.begin(), test.end() |
| ); |
| |
| if (reference_mid != reference.end()) |
| { |
| ++reference_mid; |
| ++test_mid; |
| } |
| } |
| } |
| |
| template<class Container> |
| void test_nth_element_impl(Container& cont) |
| { |
| test_nth_element_tp_impl(cont, nth_element_policy()); |
| } |
| |
| template<class Container, class BinaryPredicate> |
| void test_nth_element_impl(Container& cont, BinaryPredicate pred) |
| { |
| test_nth_element_tp_impl(cont, nth_element_pred_policy<BinaryPredicate>()); |
| } |
| |
| template<class Container> |
| void run_tests(Container& cont) |
| { |
| test_nth_element_impl(cont); |
| test_nth_element_impl(cont, std::less<int>()); |
| test_nth_element_impl(cont, std::greater<int>()); |
| } |
| |
| template<class Container> |
| void test_nth_element_impl() |
| { |
| using namespace boost::assign; |
| |
| Container cont; |
| run_tests(cont); |
| |
| cont.clear(); |
| cont += 1; |
| run_tests(cont); |
| |
| cont.clear(); |
| cont += 1,2,3,4,5,6,7,8,9; |
| run_tests(cont); |
| } |
| |
| void test_nth_element() |
| { |
| test_nth_element_impl< std::vector<int> >(); |
| test_nth_element_impl< std::deque<int> >(); |
| } |
| } |
| } |
| |
| boost::unit_test::test_suite* |
| init_unit_test_suite(int argc, char* argv[]) |
| { |
| boost::unit_test::test_suite* test |
| = BOOST_TEST_SUITE( "RangeTestSuite.algorithm.nth_element" ); |
| |
| test->add( BOOST_TEST_CASE( &boost::test_nth_element ) ); |
| |
| return test; |
| } |