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// 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 <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;
}
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