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#include <unittest/unittest.h>
#include <thrust/sort.h>
#include <thrust/iterator/retag.h>

template<typename Vector>
void TestIsSortedUntilSimple(void)
{
    typedef typename Vector::value_type T;
    typedef typename Vector::iterator Iterator;

    Vector v(4);
    v[0] = 0; v[1] = 5; v[2] = 8; v[3] = 0;

    Iterator first = v.begin();

    Iterator last  = v.begin() + 0;
    Iterator ref = last;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last));

    last = v.begin() + 1;
    ref = last;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last));

    last = v.begin() + 2;
    ref = last;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last));

    last = v.begin() + 3;
    ref = v.begin() + 3;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last));

    last = v.begin() + 4;
    ref = v.begin() + 3;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last));

    last = v.begin() + 3;
    ref = v.begin() + 3;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last, thrust::less<T>()));

    last = v.begin() + 4;
    ref = v.begin() + 3;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last, thrust::less<T>()));

    last = v.begin() + 1;
    ref = v.begin() + 1;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last, thrust::greater<T>()));

    last = v.begin() + 4;
    ref = v.begin() + 1;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last, thrust::greater<T>()));

    first = v.begin() + 2;
    last = v.begin() + 4;
    ref = v.begin() + 4;
    ASSERT_EQUAL_QUIET(ref, thrust::is_sorted_until(first, last, thrust::greater<T>()));
}
DECLARE_VECTOR_UNITTEST(TestIsSortedUntilSimple);

template<typename Vector>
void TestIsSortedUntilRepeatedElements(void)
{
  Vector v(10);

  v[0] = 0;
  v[1] = 1;
  v[2] = 1;
  v[3] = 2;
  v[4] = 3;
  v[5] = 4;
  v[6] = 5;
  v[7] = 5;
  v[8] = 5;
  v[9] = 6;

  ASSERT_EQUAL_QUIET(v.end(), thrust::is_sorted_until(v.begin(), v.end()));
}
DECLARE_VECTOR_UNITTEST(TestIsSortedUntilRepeatedElements);

template <class Vector>
void TestIsSortedUntil(void)
{
    typedef typename Vector::value_type T;

    const size_t n = (1 << 16) + 13;

    Vector v = unittest::random_integers<T>(n);

    v[0] = 1;
    v[1] = 0;

    ASSERT_EQUAL_QUIET(v.begin() + 1, thrust::is_sorted_until(v.begin(), v.end()));

    thrust::sort(v.begin(), v.end());

    ASSERT_EQUAL_QUIET(v.end(), thrust::is_sorted_until(v.begin(), v.end()));
}
DECLARE_INTEGRAL_VECTOR_UNITTEST(TestIsSortedUntil);


template<typename ForwardIterator>
ForwardIterator is_sorted_until(my_system &system, ForwardIterator first, ForwardIterator)
{
    system.validate_dispatch();
    return first;
}

void TestIsSortedUntilExplicit()
{
    thrust::device_vector<int> vec(1);

    my_system sys(0);
    thrust::is_sorted_until(sys, vec.begin(), vec.end());

    ASSERT_EQUAL(true, sys.is_valid());
}
DECLARE_UNITTEST(TestIsSortedUntilExplicit);


template<typename ForwardIterator>
ForwardIterator is_sorted_until(my_tag, ForwardIterator first, ForwardIterator)
{
    *first = 13;
    return first;
}

void TestIsSortedUntilImplicit()
{
    thrust::device_vector<int> vec(1);

    thrust::is_sorted_until(thrust::retag<my_tag>(vec.begin()),
                            thrust::retag<my_tag>(vec.end()));

    ASSERT_EQUAL(13, vec.front());
}
DECLARE_UNITTEST(TestIsSortedUntilImplicit);