156 lines
4.9 KiB
C++
156 lines
4.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <algorithm>
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// template<ForwardIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
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// constexpr OutIter // constexpr after C++17
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// rotate_copy(InIter first, InIter middle, InIter last, OutIter result);
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#include <algorithm>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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// #if TEST_STD_VER > 17
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// TEST_CONSTEXPR bool test_constexpr() {
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// int ia[] = {1, 3, 5, 2, 5, 6};
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// int ib[std::size(ia)] = {0};
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//
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// const size_t N = 2;
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// const auto middle = std::begin(ia) + N;
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// auto it = std::rotate_copy(std::begin(ia), middle, std::end(ia), std::begin(ib));
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//
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// return std::distance(std::begin(ib), it) == std::size(ia)
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// && std::equal (std::begin(ia), middle, std::begin(ib) + std::size(ia) - N)
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// && std::equal (middle, std::end(ia), std::begin(ib))
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// ;
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// }
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// #endif
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template <class InIter, class OutIter>
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void
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test()
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{
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int ia[] = {0, 1, 2, 3};
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const unsigned sa = sizeof(ia)/sizeof(ia[0]);
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int ib[sa] = {0};
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OutIter r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia), OutIter(ib));
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assert(base(r) == ib);
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r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia+1), OutIter(ib));
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assert(base(r) == ib+1);
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assert(ib[0] == 0);
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r = std::rotate_copy(InIter(ia), InIter(ia+1), InIter(ia+1), OutIter(ib));
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assert(base(r) == ib+1);
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assert(ib[0] == 0);
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r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia+2), OutIter(ib));
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assert(base(r) == ib+2);
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assert(ib[0] == 0);
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assert(ib[1] == 1);
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r = std::rotate_copy(InIter(ia), InIter(ia+1), InIter(ia+2), OutIter(ib));
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assert(base(r) == ib+2);
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assert(ib[0] == 1);
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assert(ib[1] == 0);
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r = std::rotate_copy(InIter(ia), InIter(ia+2), InIter(ia+2), OutIter(ib));
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assert(base(r) == ib+2);
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assert(ib[0] == 0);
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assert(ib[1] == 1);
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r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia+3), OutIter(ib));
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assert(base(r) == ib+3);
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assert(ib[0] == 0);
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assert(ib[1] == 1);
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assert(ib[2] == 2);
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r = std::rotate_copy(InIter(ia), InIter(ia+1), InIter(ia+3), OutIter(ib));
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assert(base(r) == ib+3);
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assert(ib[0] == 1);
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assert(ib[1] == 2);
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assert(ib[2] == 0);
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r = std::rotate_copy(InIter(ia), InIter(ia+2), InIter(ia+3), OutIter(ib));
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assert(base(r) == ib+3);
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assert(ib[0] == 2);
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assert(ib[1] == 0);
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assert(ib[2] == 1);
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r = std::rotate_copy(InIter(ia), InIter(ia+3), InIter(ia+3), OutIter(ib));
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assert(base(r) == ib+3);
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assert(ib[0] == 0);
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assert(ib[1] == 1);
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assert(ib[2] == 2);
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r = std::rotate_copy(InIter(ia), InIter(ia), InIter(ia+4), OutIter(ib));
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assert(base(r) == ib+4);
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assert(ib[0] == 0);
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assert(ib[1] == 1);
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assert(ib[2] == 2);
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assert(ib[3] == 3);
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r = std::rotate_copy(InIter(ia), InIter(ia+1), InIter(ia+4), OutIter(ib));
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assert(base(r) == ib+4);
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assert(ib[0] == 1);
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assert(ib[1] == 2);
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assert(ib[2] == 3);
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assert(ib[3] == 0);
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r = std::rotate_copy(InIter(ia), InIter(ia+2), InIter(ia+4), OutIter(ib));
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assert(base(r) == ib+4);
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assert(ib[0] == 2);
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assert(ib[1] == 3);
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assert(ib[2] == 0);
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assert(ib[3] == 1);
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r = std::rotate_copy(InIter(ia), InIter(ia+3), InIter(ia+4), OutIter(ib));
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assert(base(r) == ib+4);
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assert(ib[0] == 3);
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assert(ib[1] == 0);
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assert(ib[2] == 1);
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assert(ib[3] == 2);
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r = std::rotate_copy(InIter(ia), InIter(ia+4), InIter(ia+4), OutIter(ib));
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assert(base(r) == ib+4);
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assert(ib[0] == 0);
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assert(ib[1] == 1);
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assert(ib[2] == 2);
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assert(ib[3] == 3);
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}
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int main()
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{
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test<bidirectional_iterator<const int*>, output_iterator<int*> >();
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test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
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test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
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test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
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test<bidirectional_iterator<const int*>, int*>();
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test<random_access_iterator<const int*>, output_iterator<int*> >();
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test<random_access_iterator<const int*>, forward_iterator<int*> >();
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test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
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test<random_access_iterator<const int*>, random_access_iterator<int*> >();
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test<random_access_iterator<const int*>, int*>();
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test<const int*, output_iterator<int*> >();
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test<const int*, forward_iterator<int*> >();
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test<const int*, bidirectional_iterator<int*> >();
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test<const int*, random_access_iterator<int*> >();
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test<const int*, int*>();
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// #if TEST_STD_VER > 17
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// static_assert(test_constexpr());
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// #endif
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}
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