| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| // UNSUPPORTED: !c++experimental |
| |
| // constexpr iterator(iterator<!Const> i) |
| // requires Const && |
| // convertible_to<iterator_t<V>, OuterIter> && |
| // convertible_to<iterator_t<InnerRng>, InnerIter>; |
| |
| #include <cassert> |
| #include <ranges> |
| |
| #include "test_macros.h" |
| #include "../types.h" |
| |
| using ConstCompatibleInner = BufferView<int*>; |
| |
| using ConstIncompatibleInner = BufferView<forward_iterator<const int*>, forward_iterator<const int*>, |
| bidirectional_iterator<int*>, bidirectional_iterator<int*>>; |
| |
| template <class Inner> |
| using ConstCompatibleOuter = BufferView<const Inner*, const Inner*, Inner*, Inner*>; |
| |
| template <class Inner> |
| using ConstIncompatibleOuter = BufferView<forward_iterator<const Inner*>, forward_iterator<const Inner*>, |
| bidirectional_iterator<Inner*>, bidirectional_iterator<Inner*>>; |
| |
| constexpr bool test() { |
| int buffer[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}}; |
| { |
| CopyableChild children[4] = {CopyableChild(buffer[0]), CopyableChild(buffer[1]), CopyableChild(buffer[2]), |
| CopyableChild(buffer[3])}; |
| std::ranges::join_view jv(CopyableParent{children}); |
| auto iter1 = jv.begin(); |
| using iterator = decltype(iter1); |
| using const_iterator = decltype(std::as_const(jv).begin()); |
| static_assert(!std::is_same_v<iterator, const_iterator>); |
| const_iterator iter2 = iter1; |
| assert(iter1 == iter2); |
| |
| // We cannot create a non-const iterator from a const iterator. |
| static_assert(!std::constructible_from<iterator, const_iterator>); |
| } |
| |
| // !convertible_to<inner_iterator, inner_const_iterator>>; |
| { |
| ConstIncompatibleInner inners[2] = {buffer[0], buffer[1]}; |
| ConstCompatibleOuter<ConstIncompatibleInner> outer{inners}; |
| std::ranges::join_view jv(outer); |
| using iterator = decltype(jv.begin()); |
| using const_iterator = decltype(std::as_const(jv).begin()); |
| static_assert(!std::is_same_v<iterator, const_iterator>); |
| |
| static_assert(!std::constructible_from<const_iterator, iterator>); |
| static_assert(!std::constructible_from<iterator, const_iterator>); |
| } |
| |
| // !convertible_to<outer_iterator, outer_const_iterator>>; |
| { |
| ConstCompatibleInner inners[2] = {buffer[0], buffer[1]}; |
| ConstIncompatibleOuter<ConstCompatibleInner> outer{inners}; |
| std::ranges::join_view jv(outer); |
| using iterator = decltype(jv.begin()); |
| using const_iterator = decltype(std::as_const(jv).begin()); |
| static_assert(!std::is_same_v<iterator, const_iterator>); |
| |
| static_assert(!std::constructible_from<const_iterator, iterator>); |
| static_assert(!std::constructible_from<iterator, const_iterator>); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |