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#include <unittest/unittest.h>
#include <thrust/extrema.h>
#include <thrust/iterator/retag.h>
template <class Vector>
void TestMinMaxElementSimple(void)
{
Vector data(6);
data[0] = 3;
data[1] = 5;
data[2] = 1;
data[3] = 2;
data[4] = 5;
data[5] = 1;
ASSERT_EQUAL( *thrust::minmax_element(data.begin(), data.end()).first, 1);
ASSERT_EQUAL( *thrust::minmax_element(data.begin(), data.end()).second, 5);
ASSERT_EQUAL( thrust::minmax_element(data.begin(), data.end()).first - data.begin(), 2);
ASSERT_EQUAL( thrust::minmax_element(data.begin(), data.end()).second - data.begin(), 1);
}
DECLARE_VECTOR_UNITTEST(TestMinMaxElementSimple);
template <class Vector>
void TestMinMaxElementWithTransform(void)
{
typedef typename Vector::value_type T;
Vector data(6);
data[0] = 3;
data[1] = 5;
data[2] = 1;
data[3] = 2;
data[4] = 5;
data[5] = 1;
ASSERT_EQUAL( *thrust::minmax_element(
thrust::make_transform_iterator(data.begin(), thrust::negate<T>()),
thrust::make_transform_iterator(data.end(), thrust::negate<T>())).first, -5);
ASSERT_EQUAL( *thrust::minmax_element(
thrust::make_transform_iterator(data.begin(), thrust::negate<T>()),
thrust::make_transform_iterator(data.end(), thrust::negate<T>())).second, -1);
}
DECLARE_VECTOR_UNITTEST(TestMinMaxElementWithTransform);
template<typename T>
void TestMinMaxElement(const size_t n)
{
thrust::host_vector<T> h_data = unittest::random_samples<T>(n);
thrust::device_vector<T> d_data = h_data;
typename thrust::host_vector<T>::iterator h_min;
typename thrust::host_vector<T>::iterator h_max;
typename thrust::device_vector<T>::iterator d_min;
typename thrust::device_vector<T>::iterator d_max;
h_min = thrust::minmax_element(h_data.begin(), h_data.end()).first;
d_min = thrust::minmax_element(d_data.begin(), d_data.end()).first;
h_max = thrust::minmax_element(h_data.begin(), h_data.end()).second;
d_max = thrust::minmax_element(d_data.begin(), d_data.end()).second;
ASSERT_EQUAL(h_min - h_data.begin(), d_min - d_data.begin());
ASSERT_EQUAL(h_max - h_data.begin(), d_max - d_data.begin());
h_max = thrust::minmax_element(h_data.begin(), h_data.end(), thrust::greater<T>()).first;
d_max = thrust::minmax_element(d_data.begin(), d_data.end(), thrust::greater<T>()).first;
h_min = thrust::minmax_element(h_data.begin(), h_data.end(), thrust::greater<T>()).second;
d_min = thrust::minmax_element(d_data.begin(), d_data.end(), thrust::greater<T>()).second;
ASSERT_EQUAL(h_min - h_data.begin(), d_min - d_data.begin());
ASSERT_EQUAL(h_max - h_data.begin(), d_max - d_data.begin());
}
DECLARE_VARIABLE_UNITTEST(TestMinMaxElement);
template<typename ForwardIterator>
thrust::pair<ForwardIterator,ForwardIterator> minmax_element(my_system &system, ForwardIterator first, ForwardIterator)
{
system.validate_dispatch();
return thrust::make_pair(first,first);
}
void TestMinMaxElementDispatchExplicit()
{
thrust::device_vector<int> vec(1);
my_system sys(0);
thrust::minmax_element(sys, vec.begin(), vec.end());
ASSERT_EQUAL(true, sys.is_valid());
}
DECLARE_UNITTEST(TestMinMaxElementDispatchExplicit);
template<typename ForwardIterator>
thrust::pair<ForwardIterator,ForwardIterator> minmax_element(my_tag, ForwardIterator first, ForwardIterator)
{
*first = 13;
return thrust::make_pair(first,first);
}
void TestMinMaxElementDispatchImplicit()
{
thrust::device_vector<int> vec(1);
thrust::minmax_element(thrust::retag<my_tag>(vec.begin()),
thrust::retag<my_tag>(vec.end()));
ASSERT_EQUAL(13, vec.front());
}
DECLARE_UNITTEST(TestMinMaxElementDispatchImplicit);
void TestMinMaxElementWithBigIndexesHelper(int magnitude)
{
typedef thrust::counting_iterator<long long> Iter;
Iter begin(1);
Iter end = begin + (1ll << magnitude);
ASSERT_EQUAL(thrust::distance(begin, end), 1ll << magnitude);
thrust::pair<Iter, Iter> result = thrust::minmax_element(
thrust::device, begin, end);
ASSERT_EQUAL(*result.first, 1);
ASSERT_EQUAL(*result.second, (1ll << magnitude));
result = thrust::minmax_element(thrust::device, begin, end,
thrust::greater<long long>());
ASSERT_EQUAL(*result.second, 1);
ASSERT_EQUAL(*result.first, (1ll << magnitude));
}
void TestMinMaxElementWithBigIndexes()
{
TestMinMaxElementWithBigIndexesHelper(30);
TestMinMaxElementWithBigIndexesHelper(31);
TestMinMaxElementWithBigIndexesHelper(32);
TestMinMaxElementWithBigIndexesHelper(33);
}
DECLARE_UNITTEST(TestMinMaxElementWithBigIndexes);
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