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103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <numeric>
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// template<class InputIterator, class OutputIterator, class T>
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// OutputIterator exclusive_scan(InputIterator first, InputIterator last,
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// OutputIterator result, T init);
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//
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#include <numeric>
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#include <algorithm>
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#include <cassert>
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#include <functional>
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#include <iterator>
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#include <vector>
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#include "test_macros.h"
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#include "test_iterators.h"
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template <class Iter1, class T, class Iter2>
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void
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test(Iter1 first, Iter1 last, T init, Iter2 rFirst, Iter2 rLast)
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{
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std::vector<typename std::iterator_traits<Iter1>::value_type> v;
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// Not in place
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std::exclusive_scan(first, last, std::back_inserter(v), init);
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assert(std::equal(v.begin(), v.end(), rFirst, rLast));
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// In place
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v.clear();
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v.assign(first, last);
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std::exclusive_scan(v.begin(), v.end(), v.begin(), init);
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assert(std::equal(v.begin(), v.end(), rFirst, rLast));
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}
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template <class Iter>
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void
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test()
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{
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int ia[] = {1, 3, 5, 7, 9};
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const int pRes[] = {0, 1, 4, 9, 16};
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const unsigned sa = sizeof(ia) / sizeof(ia[0]);
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static_assert(sa == sizeof(pRes) / sizeof(pRes[0])); // just to be sure
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for (unsigned int i = 0; i < sa; ++i )
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test(Iter(ia), Iter(ia + i), 0, pRes, pRes + i);
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}
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size_t triangle(size_t n) { return n*(n+1)/2; }
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// Basic sanity
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void basic_tests()
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{
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{
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std::vector<size_t> v(10);
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std::fill(v.begin(), v.end(), 3);
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std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{50});
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for (size_t i = 0; i < v.size(); ++i)
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assert(v[i] == 50 + i * 3);
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}
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{
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std::vector<size_t> v(10);
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std::iota(v.begin(), v.end(), 0);
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std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{30});
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for (size_t i = 0; i < v.size(); ++i)
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assert(v[i] == 30 + triangle(i-1));
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}
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{
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std::vector<size_t> v(10);
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std::iota(v.begin(), v.end(), 1);
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std::exclusive_scan(v.begin(), v.end(), v.begin(), size_t{40});
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for (size_t i = 0; i < v.size(); ++i)
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assert(v[i] == 40 + triangle(i));
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}
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}
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int main(int, char**)
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{
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basic_tests();
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// All the iterator categories
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test<input_iterator <const int*> >();
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test<forward_iterator <const int*> >();
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test<bidirectional_iterator<const int*> >();
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test<random_access_iterator<const int*> >();
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test<const int*>();
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test< int*>();
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return 0;
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}
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