3d3103b733
- added views::join adaptor object - added test for the adaptor object - fixed some join_view's tests. e.g iter_swap test - added some negative tests for join_view to test that operations do not exist when constraints aren't met - added tests that locks down issues that were already addressed in previous change - LWG3500 `join_view::iterator::operator->()` is bogus - LWG3313 `join_view::iterator::operator--` is incorrectly constrained - LWG3517 `join_view::iterator`'s `iter_swap` is underconstrained - P2328R1 join_view should join all views of ranges - fixed some issues in join_view and added tests - LWG3535 `join_view::iterator::iterator_category` and `::iterator_concept` lie - LWG3474 Nesting ``join_views`` is broken because of CTAD - added tests for an LWG issue that isn't resolved in the standard yet, but the previous code has workaround. - LWG3569 Inner iterator not default_initializable Reviewed By: #libc, var-const Spies: var-const, libcxx-commits Differential Revision: https://reviews.llvm.org/D123466
84 lines
2.4 KiB
C++
84 lines
2.4 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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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// template<class R>
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// explicit join_view(R&&) -> join_view<views::all_t<R>>;
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#include <ranges>
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#include <utility>
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struct Child {
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int *begin() const;
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int *end() const;
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};
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struct View : std::ranges::view_base {
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Child *begin() const;
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Child *end() const;
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};
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struct Range {
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Child *begin() const;
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Child *end() const;
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};
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struct BorrowedRange {
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Child *begin() const;
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Child *end() const;
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};
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template<>
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inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true;
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struct NestedChildren : std::ranges::view_base {
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View* begin() const;
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View* end() const;
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};
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void testCTAD() {
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View v;
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Range r;
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BorrowedRange br;
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static_assert(std::same_as<
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decltype(std::ranges::join_view(v)),
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std::ranges::join_view<View>
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>);
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static_assert(std::same_as<
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decltype(std::ranges::join_view(std::move(v))),
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std::ranges::join_view<View>
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>);
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static_assert(std::same_as<
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decltype(std::ranges::join_view(r)),
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std::ranges::join_view<std::ranges::ref_view<Range>>
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>);
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static_assert(std::same_as<
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decltype(std::ranges::join_view(std::move(r))),
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std::ranges::join_view<std::ranges::owning_view<Range>>
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>);
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static_assert(std::same_as<
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decltype(std::ranges::join_view(br)),
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std::ranges::join_view<std::ranges::ref_view<BorrowedRange>>
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>);
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static_assert(std::same_as<
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decltype(std::ranges::join_view(std::move(br))),
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std::ranges::join_view<std::ranges::owning_view<BorrowedRange>>
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>);
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NestedChildren n;
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std::ranges::join_view jv(n);
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// CTAD generated from the copy constructor instead of joining the join_view
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static_assert(std::same_as< decltype(std::ranges::join_view(jv)), decltype(jv) >);
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// CTAD generated from the move constructor instead of joining the join_view
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static_assert(std::same_as< decltype(std::ranges::join_view(std::move(jv))), decltype(jv) >);
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}
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