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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<BidirectionalIterator InIter, BidirectionalIterator OutIter>
// requires OutputIterator<OutIter, InIter::reference>
// constexpr OutIter // constexpr after C++17
// copy_backward(InIter first, InIter last, OutIter result);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#include "user_defined_integral.hpp"
// #if TEST_STD_VER > 17
// TEST_CONSTEXPR bool test_constexpr() {
// int ia[] = {1, 2, 3, 4, 5};
// int ic[] = {6, 6, 6, 6, 6, 6, 6};
//
// size_t N = std::size(ia);
// auto p = std::copy_backward(std::begin(ia), std::end(ia), std::begin(ic) + N);
// return std::equal(std::begin(ic), p, std::begin(ia))
// && std::all_of(p, std::end(ic), [](int a){return a == 6;})
// ;
// }
// #endif
template <class InIter, class OutIter>
void
test()
{
const unsigned N = 1000;
int ia[N];
for (unsigned i = 0; i < N; ++i)
ia[i] = i;
int ib[N] = {0};
OutIter r = std::copy_backward(InIter(ia), InIter(ia+N), OutIter(ib+N));
assert(base(r) == ib);
for (unsigned i = 0; i < N; ++i)
assert(ia[i] == ib[i]);
}
int main()
{
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*>, bidirectional_iterator<int*> >();
test<random_access_iterator<const int*>, random_access_iterator<int*> >();
test<random_access_iterator<const int*>, int*>();
test<const int*, bidirectional_iterator<int*> >();
test<const int*, random_access_iterator<int*> >();
test<const int*, int*>();
// #if TEST_STD_VER > 17
// static_assert(test_constexpr());
// #endif
}
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