| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // constexpr const iterator_t<Base>& base() const & noexcept; |
| // constexpr iterator_t<Base> base() &&; |
| |
| #include <cassert> |
| #include <ranges> |
| #include <tuple> |
| #include <type_traits> |
| #include <utility> |
| |
| #include "MoveOnly.h" |
| #include "../types.h" |
| |
| // Test Noexcept |
| template <class T> |
| concept IsBaseNoexcept = |
| requires { |
| { std::declval<T>().base() } noexcept; |
| }; |
| |
| using BaseView = std::ranges::subrange<std::tuple<int>*>; |
| using ElementsIter = std::ranges::iterator_t<std::ranges::elements_view<BaseView, 0>>; |
| |
| static_assert(IsBaseNoexcept<const ElementsIter&>); |
| static_assert(IsBaseNoexcept<ElementsIter&>); |
| static_assert(IsBaseNoexcept<const ElementsIter&&>); |
| static_assert(!IsBaseNoexcept<ElementsIter&&>); |
| |
| constexpr bool test() { |
| std::tuple<int> t{5}; |
| |
| // const & |
| { |
| const ElementsIter it{&t}; |
| decltype(auto) base = it.base(); |
| static_assert(std::is_same_v<decltype(base), std::tuple<int>* const&>); |
| assert(base == &t); |
| } |
| |
| // & |
| { |
| ElementsIter it{&t}; |
| decltype(auto) base = it.base(); |
| static_assert(std::is_same_v<decltype(base), std::tuple<int>* const&>); |
| assert(base == &t); |
| } |
| |
| // && |
| { |
| ElementsIter it{&t}; |
| decltype(auto) base = std::move(it).base(); |
| static_assert(std::is_same_v<decltype(base), std::tuple<int>*>); |
| assert(base == &t); |
| } |
| |
| // const && |
| { |
| const ElementsIter it{&t}; |
| decltype(auto) base = std::move(it).base(); |
| static_assert(std::is_same_v<decltype(base), std::tuple<int>* const&>); |
| assert(base == &t); |
| } |
| |
| // move only |
| { |
| struct MoveOnlyIter : IterBase<MoveOnlyIter> { |
| MoveOnly mo; |
| }; |
| struct Sent { |
| constexpr bool operator==(const MoveOnlyIter&) const { return true; } |
| }; |
| |
| using MoveOnlyElemIter = |
| std::ranges::iterator_t<std::ranges::elements_view<std::ranges::subrange<MoveOnlyIter, Sent>, 0>>; |
| |
| MoveOnlyElemIter it{MoveOnlyIter{{}, MoveOnly{5}}}; |
| decltype(auto) base = std::move(it).base(); |
| static_assert(std::is_same_v<decltype(base), MoveOnlyIter>); |
| assert(base.mo.get() == 5); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| return 0; |
| } |