85167fb7c2
- Quality-of-implementation: Avoid calling __unwrap_iter in constexpr contexts.
The user might conceivably write a contiguous iterator where normal iterator
arithmetic is constexpr-friendly but `std::to_address(it)` isn't.
- Bugfix: When you pass contiguous iterators to `std::copy`, you should get
back your contiguous iterator type, not a raw pointer. That means that
libc++ can't `__unwrap_iter` unless it also does `__rewrap_iter`.
Fortunately, this is implementable.
- Improve test coverage of the new `contiguous_iterator` test iterator.
This catches the bug described above.
- Tests: Stop testing that we can `std::copy` //into// an `input_iterator`.
Our test iterators may currently support that, but it seems nonsensical to me.
Differential Revision: https://reviews.llvm.org/D95983
99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: clang-8
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// <algorithm>
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// template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
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// constexpr OutIter // constexpr after C++17
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// copy(InIter first, 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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template <class InIter, class OutIter>
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TEST_CONSTEXPR_CXX20 void
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test_copy()
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{
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const unsigned N = 1000;
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int ia[N] = {};
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for (unsigned i = 0; i < N; ++i)
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ia[i] = i;
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int ib[N] = {0};
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OutIter r = std::copy(InIter(ia), InIter(ia+N), OutIter(ib));
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assert(base(r) == ib+N);
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for (unsigned i = 0; i < N; ++i)
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assert(ia[i] == ib[i]);
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}
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TEST_CONSTEXPR_CXX20 bool
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test()
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{
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test_copy<input_iterator<const int*>, output_iterator<int*> >();
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test_copy<input_iterator<const int*>, forward_iterator<int*> >();
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test_copy<input_iterator<const int*>, bidirectional_iterator<int*> >();
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test_copy<input_iterator<const int*>, random_access_iterator<int*> >();
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test_copy<input_iterator<const int*>, int*>();
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test_copy<forward_iterator<const int*>, output_iterator<int*> >();
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test_copy<forward_iterator<const int*>, forward_iterator<int*> >();
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test_copy<forward_iterator<const int*>, bidirectional_iterator<int*> >();
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test_copy<forward_iterator<const int*>, random_access_iterator<int*> >();
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test_copy<forward_iterator<const int*>, int*>();
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test_copy<bidirectional_iterator<const int*>, output_iterator<int*> >();
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test_copy<bidirectional_iterator<const int*>, forward_iterator<int*> >();
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test_copy<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
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test_copy<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
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test_copy<bidirectional_iterator<const int*>, int*>();
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test_copy<random_access_iterator<const int*>, output_iterator<int*> >();
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test_copy<random_access_iterator<const int*>, forward_iterator<int*> >();
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test_copy<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
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test_copy<random_access_iterator<const int*>, random_access_iterator<int*> >();
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test_copy<random_access_iterator<const int*>, int*>();
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test_copy<const int*, output_iterator<int*> >();
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test_copy<const int*, forward_iterator<int*> >();
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test_copy<const int*, bidirectional_iterator<int*> >();
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test_copy<const int*, random_access_iterator<int*> >();
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test_copy<const int*, int*>();
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#if TEST_STD_VER > 17
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test_copy<input_iterator<const int*>, contiguous_iterator<int*>>();
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test_copy<forward_iterator<const int*>, contiguous_iterator<int*>>();
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test_copy<bidirectional_iterator<const int*>, contiguous_iterator<int*>>();
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test_copy<random_access_iterator<const int*>, contiguous_iterator<int*>>();
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test_copy<const int*, contiguous_iterator<int*>>();
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test_copy<contiguous_iterator<const int*>, output_iterator<int*>>();
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test_copy<contiguous_iterator<const int*>, forward_iterator<int*>>();
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test_copy<contiguous_iterator<const int*>, bidirectional_iterator<int*>>();
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test_copy<contiguous_iterator<const int*>, random_access_iterator<int*>>();
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test_copy<contiguous_iterator<const int*>, int*>();
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#endif
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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