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#include <thrust/extrema.h>
#include <thrust/iterator/retag.h>
#include <unittest/unittest.h>
template <class Vector>
void TestMinElementSimple()
{
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::min_element(data.begin(), data.end()), 1);
ASSERT_EQUAL(thrust::min_element(data.begin(), data.end()) - data.begin(), 2);
ASSERT_EQUAL(*thrust::min_element(data.begin(), data.end(), thrust::greater<T>()), 5);
ASSERT_EQUAL(thrust::min_element(data.begin(), data.end(), thrust::greater<T>()) - data.begin(), 1);
}
DECLARE_VECTOR_UNITTEST(TestMinElementSimple);
template <class Vector>
void TestMinElementWithTransform()
{
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::min_element(thrust::make_transform_iterator(data.begin(), thrust::negate<T>()),
thrust::make_transform_iterator(data.end(), thrust::negate<T>())),
-5);
ASSERT_EQUAL(*thrust::min_element(thrust::make_transform_iterator(data.begin(), thrust::negate<T>()),
thrust::make_transform_iterator(data.end(), thrust::negate<T>()),
thrust::greater<T>()),
-1);
}
DECLARE_VECTOR_UNITTEST(TestMinElementWithTransform);
template <typename T>
void TestMinElement(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 = thrust::min_element(h_data.begin(), h_data.end());
typename thrust::device_vector<T>::iterator d_min = thrust::min_element(d_data.begin(), d_data.end());
ASSERT_EQUAL(h_min - h_data.begin(), d_min - d_data.begin());
typename thrust::host_vector<T>::iterator h_max =
thrust::min_element(h_data.begin(), h_data.end(), thrust::greater<T>());
typename thrust::device_vector<T>::iterator d_max =
thrust::min_element(d_data.begin(), d_data.end(), thrust::greater<T>());
ASSERT_EQUAL(h_max - h_data.begin(), d_max - d_data.begin());
}
DECLARE_VARIABLE_UNITTEST(TestMinElement);
template <typename ForwardIterator>
ForwardIterator min_element(my_system& system, ForwardIterator first, ForwardIterator)
{
system.validate_dispatch();
return first;
}
void TestMinElementDispatchExplicit()
{
thrust::device_vector<int> vec(1);
my_system sys(0);
thrust::min_element(sys, vec.begin(), vec.end());
ASSERT_EQUAL(true, sys.is_valid());
}
DECLARE_UNITTEST(TestMinElementDispatchExplicit);
template <typename ForwardIterator>
ForwardIterator min_element(my_tag, ForwardIterator first, ForwardIterator)
{
*first = 13;
return first;
}
void TestMinElementDispatchImplicit()
{
thrust::device_vector<int> vec(1);
thrust::min_element(thrust::retag<my_tag>(vec.begin()), thrust::retag<my_tag>(vec.end()));
ASSERT_EQUAL(13, vec.front());
}
DECLARE_UNITTEST(TestMinElementDispatchImplicit);
void TestMinElementWithBigIndexesHelper(int magnitude)
{
thrust::counting_iterator<long long> begin(1);
thrust::counting_iterator<long long> end = begin + (1ll << magnitude);
ASSERT_EQUAL(thrust::distance(begin, end), 1ll << magnitude);
ASSERT_EQUAL(*thrust::min_element(thrust::device, begin, end, thrust::greater<long long>()), (1ll << magnitude));
}
void TestMinElementWithBigIndexes()
{
TestMinElementWithBigIndexesHelper(30);
TestMinElementWithBigIndexesHelper(31);
TestMinElementWithBigIndexesHelper(32);
TestMinElementWithBigIndexesHelper(33);
}
DECLARE_UNITTEST(TestMinElementWithBigIndexes);
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