97 lines
3.6 KiB
C++
97 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: c++03, c++11, c++14, c++17
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// template<bool OtherConst>
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// requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>>
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// friend constexpr bool operator==(const iterator<OtherConst>& x, const sentinel& y);
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#include <cassert>
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#include <concepts>
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#include <functional>
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#include <ranges>
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#include "../types.h"
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template <class Iter, class Sent>
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concept EqualityComparable = std::invocable<std::equal_to<>, const Iter&, const Sent&> ;
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using Iterator = random_access_iterator<BufferView<int*>*>;
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using ConstIterator = random_access_iterator<const BufferView<int*>*>;
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template <bool Const>
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struct ConstComparableSentinel {
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using Iter = std::conditional_t<Const, ConstIterator, Iterator>;
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Iter iter_;
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explicit ConstComparableSentinel() = default;
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constexpr explicit ConstComparableSentinel(const Iter& it) : iter_(it) {}
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constexpr friend bool operator==(const Iterator& i, const ConstComparableSentinel& s) {
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return base(i) == base(s.iter_);
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}
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constexpr friend bool operator==(const ConstIterator& i, const ConstComparableSentinel& s) {
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return base(i) == base(s.iter_);
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}
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};
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struct ConstComparableView : BufferView<BufferView<int*>*> {
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using BufferView<BufferView<int*>*>::BufferView;
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constexpr auto begin() { return Iterator(data_); }
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constexpr auto begin() const { return ConstIterator(data_); }
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constexpr auto end() { return ConstComparableSentinel<false>(Iterator(data_ + size_)); }
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constexpr auto end() const { return ConstComparableSentinel<true>(ConstIterator(data_ + size_)); }
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};
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static_assert(EqualityComparable<std::ranges::iterator_t<ConstComparableView>,
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std::ranges::sentinel_t<const ConstComparableView>>);
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static_assert(EqualityComparable<std::ranges::iterator_t<const ConstComparableView>,
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std::ranges::sentinel_t<ConstComparableView>>);
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constexpr bool test() {
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int buffer[4][4] = {{1111, 2222, 3333, 4444}, {555, 666, 777, 888}, {99, 1010, 1111, 1212}, {13, 14, 15, 16}};
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{
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ChildView children[4] = {ChildView(buffer[0]), ChildView(buffer[1]), ChildView(buffer[2]), ChildView(buffer[3])};
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auto jv = std::ranges::join_view(ParentView(children));
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assert(jv.end() == std::ranges::next(jv.begin(), 16));
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static_assert(!EqualityComparable<decltype(std::as_const(jv).begin()), decltype(jv.end())>);
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static_assert(!EqualityComparable<decltype(jv.begin()), decltype(std::as_const(jv).end())>);
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}
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{
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CopyableChild children[4] = {CopyableChild(buffer[0]), CopyableChild(buffer[1]), CopyableChild(buffer[2]),
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CopyableChild(buffer[3])};
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const auto jv = std::ranges::join_view(ParentView(children));
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assert(jv.end() == std::ranges::next(jv.begin(), 16));
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}
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// test iterator<Const> == sentinel<!Const>
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{
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BufferView<int*> inners[] = {buffer[0], buffer[1]};
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ConstComparableView outer(inners);
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auto jv = std::ranges::join_view(outer);
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assert(jv.end() == std::ranges::next(jv.begin(), 8));
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assert(std::as_const(jv).end() == std::ranges::next(jv.begin(), 8));
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assert(jv.end() == std::ranges::next(std::as_const(jv).begin(), 8));
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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