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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
// UNSUPPORTED: clang-8
// Became constexpr in C++20
// template<class InputIterator, class OutputIterator, class T,
// class BinaryOperation, class UnaryOperation>
// OutputIterator transform_inclusive_scan(InputIterator first, InputIterator last,
// OutputIterator result,
// BinaryOperation binary_op,
// UnaryOperation unary_op,
// T init);
#include <numeric>
#include <algorithm>
#include <array>
#include <cassert>
#include <functional>
#include <iterator>
#include <vector>
#include "test_macros.h"
#include "test_iterators.h"
// FIXME Remove constexpr vector workaround introduced in D90569
#if TEST_STD_VER > 17
#include <span>
#endif
struct add_one {
template <typename T>
constexpr auto operator()(T x) const noexcept {
return static_cast<T>(x + 1);
}
};
template <class Iter1, class BOp, class UOp, class T, class Iter2>
TEST_CONSTEXPR_CXX20 void
test(Iter1 first, Iter1 last, BOp bop, UOp uop, T init, Iter2 rFirst, Iter2 rLast)
{
// C++17 doesn't test constexpr so can use a vector.
// C++20 can use vector in constexpr evaluation, but both libc++ and MSVC
// don't have the support yet. In these cases use a std::span for the test.
// FIXME Remove constexpr vector workaround introduced in D90569
size_t size = std::distance(first, last);
#if TEST_STD_VER < 20 || \
(defined(__cpp_lib_constexpr_vector) && __cpp_lib_constexpr_vector >= 201907L)
std::vector<typename std::iterator_traits<Iter1>::value_type> v(size);
#else
assert((size <= 5) && "Increment the size of the array");
typename std::iterator_traits<Iter1>::value_type b[5];
std::span<typename std::iterator_traits<Iter1>::value_type> v{b, size};
#endif
// Test not in-place
std::transform_inclusive_scan(first, last, v.begin(), bop, uop, init);
assert(std::equal(v.begin(), v.end(), rFirst, rLast));
// Test in-place
std::copy(first, last, v.begin());
std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), bop, uop, init);
assert(std::equal(v.begin(), v.end(), rFirst, rLast));
}
template <class Iter>
TEST_CONSTEXPR_CXX20 void
test()
{
int ia[] = { 1, 3, 5, 7, 9 };
const int pResI0[] = { 2, 6, 12, 20, 30 }; // with add_one
const int mResI0[] = { 0, 0, 0, 0, 0 };
const int pResN0[] = { -1, -4, -9, -16, -25 }; // with negate
const int mResN0[] = { 0, 0, 0, 0, 0 };
const int pResI2[] = { 4, 8, 14, 22, 32 }; // with add_one
const int mResI2[] = { 4, 16, 96, 768, 7680 };
const int pResN2[] = { 1, -2, -7, -14, -23 }; // with negate
const int mResN2[] = { -2, 6, -30, 210, -1890 };
const unsigned sa = sizeof(ia) / sizeof(ia[0]);
static_assert(sa == sizeof(pResI0) / sizeof(pResI0[0])); // just to be sure
static_assert(sa == sizeof(mResI0) / sizeof(mResI0[0])); // just to be sure
static_assert(sa == sizeof(pResN0) / sizeof(pResN0[0])); // just to be sure
static_assert(sa == sizeof(mResN0) / sizeof(mResN0[0])); // just to be sure
static_assert(sa == sizeof(pResI2) / sizeof(pResI2[0])); // just to be sure
static_assert(sa == sizeof(mResI2) / sizeof(mResI2[0])); // just to be sure
static_assert(sa == sizeof(pResN2) / sizeof(pResN2[0])); // just to be sure
static_assert(sa == sizeof(mResN2) / sizeof(mResN2[0])); // just to be sure
for (unsigned int i = 0; i < sa; ++i ) {
test(Iter(ia), Iter(ia + i), std::plus<>(), add_one{}, 0, pResI0, pResI0 + i);
test(Iter(ia), Iter(ia + i), std::multiplies<>(), add_one{}, 0, mResI0, mResI0 + i);
test(Iter(ia), Iter(ia + i), std::plus<>(), std::negate<>(), 0, pResN0, pResN0 + i);
test(Iter(ia), Iter(ia + i), std::multiplies<>(), std::negate<>(), 0, mResN0, mResN0 + i);
test(Iter(ia), Iter(ia + i), std::plus<>(), add_one{}, 2, pResI2, pResI2 + i);
test(Iter(ia), Iter(ia + i), std::multiplies<>(), add_one{}, 2, mResI2, mResI2 + i);
test(Iter(ia), Iter(ia + i), std::plus<>(), std::negate<>(), 2, pResN2, pResN2 + i);
test(Iter(ia), Iter(ia + i), std::multiplies<>(), std::negate<>(), 2, mResN2, mResN2 + i);
}
}
constexpr size_t triangle(size_t n) { return n*(n+1)/2; }
// Basic sanity
TEST_CONSTEXPR_CXX20 void
basic_tests()
{
{
std::array<size_t, 10> v;
std::fill(v.begin(), v.end(), 3);
std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, size_t{50});
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == 50 + (i + 1) * 4);
}
{
std::array<size_t, 10> v;
std::iota(v.begin(), v.end(), 0);
std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, size_t{30});
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == 30 + triangle(i) + i + 1);
}
{
std::array<size_t, 10> v;
std::iota(v.begin(), v.end(), 1);
std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), add_one{}, size_t{40});
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == 40 + triangle(i + 1) + i + 1);
}
{
// C++17 doesn't test constexpr so can use a vector.
// C++20 can use vector in constexpr evaluation, but both libc++ and MSVC
// don't have the support yet. In these cases use a std::span for the test.
// FIXME Remove constexpr vector workaround introduced in D90569
#if TEST_STD_VER < 20 || \
(defined(__cpp_lib_constexpr_vector) && __cpp_lib_constexpr_vector >= 201907L)
std::vector<size_t> v, res;
std::transform_inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::plus<>(), add_one{}, size_t{1});
#else
std::array<size_t, 0> v, res;
std::transform_inclusive_scan(v.begin(), v.end(), res.begin(), std::plus<>(), add_one{}, size_t{1});
#endif
assert(res.empty());
}
// Make sure that the calculations are done using the init typedef
{
std::array<unsigned char, 10> v;
std::iota(v.begin(), v.end(), static_cast<unsigned char>(1));
// C++17 doesn't test constexpr so can use a vector.
// C++20 can use vector in constexpr evaluation, but both libc++ and MSVC
// don't have the support yet. In these cases use a std::span for the test.
// FIXME Remove constexpr vector workaround introduced in D90569
#if TEST_STD_VER < 20 || \
(defined(__cpp_lib_constexpr_vector) && __cpp_lib_constexpr_vector >= 201907L)
std::vector<size_t> res;
std::transform_inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::multiplies<>(), add_one{}, size_t{1});
#else
std::array<size_t, 10> res;
std::transform_inclusive_scan(v.begin(), v.end(), res.begin(), std::multiplies<>(), add_one{}, size_t{1});
#endif
assert(res.size() == 10);
size_t j = 2;
assert(res[0] == 2);
for (size_t i = 1; i < res.size(); ++i)
{
j *= i + 2;
assert(res[i] == j);
}
}
}
TEST_CONSTEXPR_CXX20 bool
test()
{
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 true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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