forked from OSchip/llvm-project
103 lines
2.9 KiB
C++
103 lines
2.9 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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// constexpr const iterator_t<Base>& inner-iterator::base() const& noexcept;
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//
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// constexpr iterator_t<Base> inner-iterator::base() &&
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// requires forward_range<View>;
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#include <ranges>
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#include <concepts>
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#include <utility>
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#include "../types.h"
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static_assert( noexcept(std::declval<InnerIterForward&>().base()));
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static_assert( noexcept(std::declval<InnerIterForward const &>().base()));
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static_assert( noexcept(std::declval<InnerIterForward const &&>().base()));
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static_assert( noexcept(std::declval<InnerIterInput&>().base()));
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static_assert( noexcept(std::declval<InnerIterInput const &>().base()));
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static_assert( noexcept(std::declval<InnerIterInput const &&>().base()));
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constexpr bool test() {
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// `base` works with a forward view (two different overloads based on ref-qualification of the `inner-iterator`).
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{
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using BaseIter = std::ranges::iterator_t<CopyableView>;
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CopyableView input("abc def");
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std::ranges::lazy_split_view<CopyableView, ForwardView> v(input, " ");
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auto i = (*v.begin()).begin();
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const auto ci = i;
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// Note: some macOS platforms seem to have trouble deducing the type when using `std::same_as` -- use the equivalent
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// `ASSERT_SAME_TYPE` instead.
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{
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decltype(auto) b = i.base();
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ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
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assert(b == input.begin());
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}
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{
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decltype(auto) b = ci.base();
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ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
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assert(b == input.begin());
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}
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{
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decltype(auto) b = std::move(i).base();
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ASSERT_SAME_TYPE(decltype(b), BaseIter);
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assert(b == input.begin());
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}
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{
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decltype(auto) b = std::move(ci).base();
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ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
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assert(b == input.begin());
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}
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}
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// `base` works with an input view (no overloads).
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{
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using BaseIter = std::ranges::iterator_t<InputView>;
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InputView input("abc def");
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std::ranges::lazy_split_view<InputView, ForwardTinyView> v(input, ' ');
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auto i = (*v.begin()).begin();
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const auto ci = i;
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{
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decltype(auto) b = i.base();
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ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
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}
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{
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decltype(auto) b = ci.base();
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ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
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}
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{
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decltype(auto) b = std::move(i).base();
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ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
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}
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{
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decltype(auto) b = std::move(ci).base();
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ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
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}
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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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