| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // UNSUPPORTED: libcpp-no-concepts |
| // UNSUPPORTED: libcpp-has-no-incomplete-ranges |
| |
| // constexpr T* begin() noexcept; |
| // constexpr const T* begin() const noexcept; |
| |
| #include <ranges> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| struct Empty {}; |
| struct BigType { char buffer[64] = {10}; }; |
| |
| constexpr bool test() { |
| { |
| auto sv = std::ranges::single_view<int>(42); |
| assert(*sv.begin() == 42); |
| |
| ASSERT_SAME_TYPE(decltype(sv.begin()), int*); |
| static_assert(noexcept(sv.begin())); |
| } |
| { |
| const auto sv = std::ranges::single_view<int>(42); |
| assert(*sv.begin() == 42); |
| |
| ASSERT_SAME_TYPE(decltype(sv.begin()), const int*); |
| static_assert(noexcept(sv.begin())); |
| } |
| |
| { |
| auto sv = std::ranges::single_view<Empty>(Empty()); |
| assert(sv.begin() != nullptr); |
| |
| ASSERT_SAME_TYPE(decltype(sv.begin()), Empty*); |
| } |
| { |
| const auto sv = std::ranges::single_view<Empty>(Empty()); |
| assert(sv.begin() != nullptr); |
| |
| ASSERT_SAME_TYPE(decltype(sv.begin()), const Empty*); |
| } |
| |
| { |
| auto sv = std::ranges::single_view<BigType>(BigType()); |
| assert(sv.begin()->buffer[0] == 10); |
| |
| ASSERT_SAME_TYPE(decltype(sv.begin()), BigType*); |
| } |
| { |
| const auto sv = std::ranges::single_view<BigType>(BigType()); |
| assert(sv.begin()->buffer[0] == 10); |
| |
| ASSERT_SAME_TYPE(decltype(sv.begin()), const BigType*); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |