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
50 lines
1.3 KiB
C++
50 lines
1.3 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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// join_view() requires default_initializable<V> = default;
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#include <cassert>
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#include <ranges>
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#include "types.h"
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struct DefaultView : std::ranges::view_base {
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int i; // deliberately uninitialised
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ChildView* begin() const;
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ChildView* end() const;
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};
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constexpr bool test() {
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{
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std::ranges::join_view<ParentView<ChildView>> jv;
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assert(std::move(jv).base().ptr_ == globalChildren);
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}
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// Default constructor should value initialise underlying view
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{
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std::ranges::join_view<DefaultView> jv;
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assert(jv.base().i == 0);
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}
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static_assert( std::default_initializable<std::ranges::join_view<ParentView<ChildView>>>);
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static_assert(!std::default_initializable<std::ranges::join_view<CopyableParent>>);
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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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