rotate_copy.pass.cpp
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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 after C++17
// rotate_copy(InIter first, InIter middle, InIter last, OutIter result);
// Older compilers don't support std::is_constant_evaluated
// UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8
// UNSUPPORTED: apple-clang-9, apple-clang-10
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
template <class InIter, class OutIter>
TEST_CONSTEXPR_CXX20 void test() {
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 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 all_tests() {
test<bidirectional_iterator<const int*>, output_iterator<int*> >();
test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
test<bidirectional_iterator<const int*>, int*>();
test<random_access_iterator<const int*>, output_iterator<int*> >();
test<random_access_iterator<const int*>, forward_iterator<int*> >();
test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
test<random_access_iterator<const int*>, random_access_iterator<int*> >();
test<random_access_iterator<const int*>, int*>();
test<const int*, output_iterator<int*> >();
test<const int*, forward_iterator<int*> >();
test<const int*, bidirectional_iterator<int*> >();
test<const int*, random_access_iterator<int*> >();
test<const int*, int*>();
return true;
}
int main(int, char**) {
all_tests();
#if TEST_STD_VER > 17
static_assert(all_tests());
#endif
return 0;
}