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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <numeric>
// UNSUPPORTED: c++03, c++11, c++14
// template<class InputIterator, class OutputIterator, class T>
// OutputIterator exclusive_scan(InputIterator first, InputIterator last,
// OutputIterator result, T init);
//
#include <numeric>
#include <algorithm>
#include <cassert>
#include <functional>
#include <iterator>
#include <vector>
#include "test_macros.h"
#include "test_iterators.h"
template <class Iter1, class T, class Iter2>
void
test(Iter1 first, Iter1 last, T init, Iter2 rFirst, Iter2 rLast)
{
std::vector<typename std::iterator_traits<Iter1>::value_type> v;
// Not in place
std::exclusive_scan(first, last, std::back_inserter(v), init);
assert(std::equal(v.begin(), v.end(), rFirst, rLast));
// In place
v.clear();
v.assign(first, last);
std::exclusive_scan(v.begin(), v.end(), v.begin(), init);
assert(std::equal(v.begin(), v.end(), rFirst, rLast));
}
template <class Iter>
void
test()
{
int ia[] = {1, 3, 5, 7, 9};
const int pRes[] = {0, 1, 4, 9, 16};
const unsigned sa = sizeof(ia) / sizeof(ia[0]);
static_assert(sa == sizeof(pRes) / sizeof(pRes[0])); // just to be sure
for (unsigned int i = 0; i < sa; ++i )
test(Iter(ia), Iter(ia + i), 0, pRes, pRes + i);
}
size_t triangle(size_t n) { return n*(n+1)/2; }
// Basic sanity
void basic_tests()
{
{
std::vector<size_t> v(10);
std::fill(v.begin(), v.end(), 3);
std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{50});
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == 50 + i * 3);
}
{
std::vector<size_t> v(10);
std::iota(v.begin(), v.end(), 0);
std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{30});
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == 30 + triangle(i-1));
}
{
std::vector<size_t> v(10);
std::iota(v.begin(), v.end(), 1);
std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{40});
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == 40 + triangle(i));
}
}
int main(int, char**)
{
basic_tests();
// All the iterator categories
test<input_iterator <const int*> >();
test<forward_iterator <const int*> >();
test<bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*> >();
test<const int*>();
test< int*>();
return 0;
}
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