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#include <unittest/unittest.h>
#include <thrust/sort.h>
#include <thrust/iterator/counting_iterator.h>
#include <thrust/iterator/transform_iterator.h>
#include <thrust/iterator/permutation_iterator.h>
#include <thrust/functional.h>
template <typename Iterator>
class strided_range
{
public:
typedef typename thrust::iterator_difference<Iterator>::type difference_type;
struct stride_functor : public thrust::unary_function<difference_type,difference_type>
{
difference_type stride;
stride_functor(difference_type stride)
: stride(stride) {}
__host__ __device__
difference_type operator()(const difference_type& i) const
{
return stride * i;
}
};
typedef typename thrust::counting_iterator<difference_type> CountingIterator;
typedef typename thrust::transform_iterator<stride_functor, CountingIterator> TransformIterator;
typedef typename thrust::permutation_iterator<Iterator,TransformIterator> PermutationIterator;
// type of the strided_range iterator
typedef PermutationIterator iterator;
// construct strided_range for the range [first,last)
strided_range(Iterator first, Iterator last, difference_type stride)
: first(first), last(last), stride(stride) {}
iterator begin(void) const
{
return PermutationIterator(first, TransformIterator(CountingIterator(0), stride_functor(stride)));
}
iterator end(void) const
{
return begin() + ((last - first) + (stride - 1)) / stride;
}
protected:
Iterator first;
Iterator last;
difference_type stride;
};
template <class Vector>
void TestSortPermutationIterator(void)
{
typedef typename Vector::iterator Iterator;
Vector A(10);
A[0] = 2;
A[1] = 9;
A[2] = 0;
A[3] = 1;
A[4] = 5;
A[5] = 3;
A[6] = 8;
A[7] = 6;
A[8] = 7;
A[9] = 4;
strided_range<Iterator> S(A.begin(), A.end(), 2);
thrust::sort(S.begin(), S.end());
ASSERT_EQUAL(A[0], 0);
ASSERT_EQUAL(A[1], 9);
ASSERT_EQUAL(A[2], 2);
ASSERT_EQUAL(A[3], 1);
ASSERT_EQUAL(A[4], 5);
ASSERT_EQUAL(A[5], 3);
ASSERT_EQUAL(A[6], 7);
ASSERT_EQUAL(A[7], 6);
ASSERT_EQUAL(A[8], 8);
ASSERT_EQUAL(A[9], 4);
}
DECLARE_VECTOR_UNITTEST(TestSortPermutationIterator);
template <class Vector>
void TestStableSortPermutationIterator(void)
{
typedef typename Vector::iterator Iterator;
Vector A(10);
A[0] = 2;
A[1] = 9;
A[2] = 0;
A[3] = 1;
A[4] = 5;
A[5] = 3;
A[6] = 8;
A[7] = 6;
A[8] = 7;
A[9] = 4;
strided_range<Iterator> S(A.begin(), A.end(), 2);
thrust::stable_sort(S.begin(), S.end());
ASSERT_EQUAL(A[0], 0);
ASSERT_EQUAL(A[1], 9);
ASSERT_EQUAL(A[2], 2);
ASSERT_EQUAL(A[3], 1);
ASSERT_EQUAL(A[4], 5);
ASSERT_EQUAL(A[5], 3);
ASSERT_EQUAL(A[6], 7);
ASSERT_EQUAL(A[7], 6);
ASSERT_EQUAL(A[8], 8);
ASSERT_EQUAL(A[9], 4);
}
DECLARE_VECTOR_UNITTEST(TestStableSortPermutationIterator);
template <class Vector>
void TestSortByKeyPermutationIterator(void)
{
typedef typename Vector::iterator Iterator;
Vector A(10), B(10);
A[0] = 2; B[0] = 0;
A[1] = 9; B[1] = 1;
A[2] = 0; B[2] = 2;
A[3] = 1; B[3] = 3;
A[4] = 5; B[4] = 4;
A[5] = 3; B[5] = 5;
A[6] = 8; B[6] = 6;
A[7] = 6; B[7] = 7;
A[8] = 7; B[8] = 8;
A[9] = 4; B[9] = 9;
strided_range<Iterator> S(A.begin(), A.end(), 2);
strided_range<Iterator> T(B.begin(), B.end(), 2);
thrust::sort_by_key(S.begin(), S.end(), T.begin());
ASSERT_EQUAL(A[0], 0);
ASSERT_EQUAL(A[1], 9);
ASSERT_EQUAL(A[2], 2);
ASSERT_EQUAL(A[3], 1);
ASSERT_EQUAL(A[4], 5);
ASSERT_EQUAL(A[5], 3);
ASSERT_EQUAL(A[6], 7);
ASSERT_EQUAL(A[7], 6);
ASSERT_EQUAL(A[8], 8);
ASSERT_EQUAL(A[9], 4);
ASSERT_EQUAL(B[0], 2);
ASSERT_EQUAL(B[1], 1);
ASSERT_EQUAL(B[2], 0);
ASSERT_EQUAL(B[3], 3);
ASSERT_EQUAL(B[4], 4);
ASSERT_EQUAL(B[5], 5);
ASSERT_EQUAL(B[6], 8);
ASSERT_EQUAL(B[7], 7);
ASSERT_EQUAL(B[8], 6);
ASSERT_EQUAL(B[9], 9);
}
DECLARE_VECTOR_UNITTEST(TestSortByKeyPermutationIterator);
template <class Vector>
void TestStableSortByKeyPermutationIterator(void)
{
typedef typename Vector::iterator Iterator;
Vector A(10), B(10);
A[0] = 2; B[0] = 0;
A[1] = 9; B[1] = 1;
A[2] = 0; B[2] = 2;
A[3] = 1; B[3] = 3;
A[4] = 5; B[4] = 4;
A[5] = 3; B[5] = 5;
A[6] = 8; B[6] = 6;
A[7] = 6; B[7] = 7;
A[8] = 7; B[8] = 8;
A[9] = 4; B[9] = 9;
strided_range<Iterator> S(A.begin(), A.end(), 2);
strided_range<Iterator> T(B.begin(), B.end(), 2);
thrust::stable_sort_by_key(S.begin(), S.end(), T.begin());
ASSERT_EQUAL(A[0], 0);
ASSERT_EQUAL(A[1], 9);
ASSERT_EQUAL(A[2], 2);
ASSERT_EQUAL(A[3], 1);
ASSERT_EQUAL(A[4], 5);
ASSERT_EQUAL(A[5], 3);
ASSERT_EQUAL(A[6], 7);
ASSERT_EQUAL(A[7], 6);
ASSERT_EQUAL(A[8], 8);
ASSERT_EQUAL(A[9], 4);
ASSERT_EQUAL(B[0], 2);
ASSERT_EQUAL(B[1], 1);
ASSERT_EQUAL(B[2], 0);
ASSERT_EQUAL(B[3], 3);
ASSERT_EQUAL(B[4], 4);
ASSERT_EQUAL(B[5], 5);
ASSERT_EQUAL(B[6], 8);
ASSERT_EQUAL(B[7], 7);
ASSERT_EQUAL(B[8], 6);
ASSERT_EQUAL(B[9], 9);
}
DECLARE_VECTOR_UNITTEST(TestStableSortByKeyPermutationIterator);
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