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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
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<ForwardIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
// constexpr OutIter // constexpr since C++20
// rotate_copy(InIter first, InIter middle, InIter last, OutIter result);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#include "type_algorithms.h"
struct TestIter {
template <class InIter>
TEST_CONSTEXPR_CXX20 void operator()() const {
types::for_each(
types::concatenate_t<types::forward_iterator_list<int*>, types::type_list<cpp17_output_iterator<int*> > >(),
TestImpl<InIter>());
}
template <class InIter>
struct TestImpl {
template <class OutIter>
TEST_CONSTEXPR_CXX20 void operator()() const {
int ia[] = {0, 1, 2, 3};
const unsigned sa = sizeof(ia) / sizeof(ia[0]);
int ib[sa] = {0};
OutIter r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia), OutIter(ib));
assert(base(r) == ib);
r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia + 1), OutIter(ib));
assert(base(r) == ib + 1);
assert(ib[0] == 0);
r = std::rotate_copy(InIter(ia), InIter(ia + 1), InIter(ia + 1), OutIter(ib));
assert(base(r) == ib + 1);
assert(ib[0] == 0);
r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia + 2), OutIter(ib));
assert(base(r) == ib + 2);
assert(ib[0] == 0);
assert(ib[1] == 1);
r = std::rotate_copy(InIter(ia), InIter(ia + 1), InIter(ia + 2), OutIter(ib));
assert(base(r) == ib + 2);
assert(ib[0] == 1);
assert(ib[1] == 0);
r = std::rotate_copy(InIter(ia), InIter(ia + 2), InIter(ia + 2), OutIter(ib));
assert(base(r) == ib + 2);
assert(ib[0] == 0);
assert(ib[1] == 1);
r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia + 3), OutIter(ib));
assert(base(r) == ib + 3);
assert(ib[0] == 0);
assert(ib[1] == 1);
assert(ib[2] == 2);
r = std::rotate_copy(InIter(ia), InIter(ia + 1), InIter(ia + 3), OutIter(ib));
assert(base(r) == ib + 3);
assert(ib[0] == 1);
assert(ib[1] == 2);
assert(ib[2] == 0);
r = std::rotate_copy(InIter(ia), InIter(ia + 2), InIter(ia + 3), OutIter(ib));
assert(base(r) == ib + 3);
assert(ib[0] == 2);
assert(ib[1] == 0);
assert(ib[2] == 1);
r = std::rotate_copy(InIter(ia), InIter(ia + 3), InIter(ia + 3), OutIter(ib));
assert(base(r) == ib + 3);
assert(ib[0] == 0);
assert(ib[1] == 1);
assert(ib[2] == 2);
r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia + 4), OutIter(ib));
assert(base(r) == ib + 4);
assert(ib[0] == 0);
assert(ib[1] == 1);
assert(ib[2] == 2);
assert(ib[3] == 3);
r = std::rotate_copy(InIter(ia), InIter(ia + 1), InIter(ia + 4), OutIter(ib));
assert(base(r) == ib + 4);
assert(ib[0] == 1);
assert(ib[1] == 2);
assert(ib[2] == 3);
assert(ib[3] == 0);
r = std::rotate_copy(InIter(ia), InIter(ia + 2), InIter(ia + 4), OutIter(ib));
assert(base(r) == ib + 4);
assert(ib[0] == 2);
assert(ib[1] == 3);
assert(ib[2] == 0);
assert(ib[3] == 1);
r = std::rotate_copy(InIter(ia), InIter(ia + 3), InIter(ia + 4), OutIter(ib));
assert(base(r) == ib + 4);
assert(ib[0] == 3);
assert(ib[1] == 0);
assert(ib[2] == 1);
assert(ib[3] == 2);
r = std::rotate_copy(InIter(ia), InIter(ia + 4), InIter(ia + 4), OutIter(ib));
assert(base(r) == ib + 4);
assert(ib[0] == 0);
assert(ib[1] == 1);
assert(ib[2] == 2);
assert(ib[3] == 3);
{
int ints[] = {1, 3, 5, 2, 5, 6};
int const n_ints = sizeof(ints) / sizeof(int);
int zeros[n_ints] = {0};
const std::size_t N = 2;
const auto middle = std::begin(ints) + N;
auto it = std::rotate_copy(std::begin(ints), middle, std::end(ints), std::begin(zeros));
assert(std::distance(std::begin(zeros), it) == n_ints);
assert(std::equal(std::begin(ints), middle, std::begin(zeros) + n_ints - N));
assert(std::equal(middle, std::end(ints), std::begin(zeros)));
}
}
};
};
TEST_CONSTEXPR_CXX20 bool test() {
types::for_each(types::bidirectional_iterator_list<const int*>(), TestIter());
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
return 0;
}
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