c2b3986e39
This is in anticipation of https://isocpp.org/files/papers/D2770R0.html, which is ABI-breaking for `join_view`. Differential Revision: https://reviews.llvm.org/D142520
50 lines
1.2 KiB
C++
50 lines
1.2 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: !c++experimental
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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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