| //===----------------------------------------------------------------------===// |
| // |
| // 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: !stdlib=libc++ && (c++03 || c++11 || c++14) |
| |
| // <string_view> |
| |
| // constexpr const _CharT& front(); |
| |
| #include <string_view> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| template <typename CharT> |
| bool test(const CharT* s, std::size_t len) { |
| typedef std::basic_string_view<CharT> SV; |
| SV sv(s, len); |
| ASSERT_SAME_TYPE(decltype(sv.back()), typename SV::const_reference); |
| LIBCPP_ASSERT_NOEXCEPT(sv.back()); |
| assert(sv.length() == len); |
| assert(sv.back() == s[len - 1]); |
| return &sv.back() == s + len - 1; |
| } |
| |
| int main(int, char**) { |
| assert(test("ABCDE", 5)); |
| assert(test("a", 1)); |
| |
| #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| assert(test(L"ABCDE", 5)); |
| assert(test(L"a", 1)); |
| #endif |
| |
| #if TEST_STD_VER >= 11 |
| assert(test(u"ABCDE", 5)); |
| assert(test(u"a", 1)); |
| |
| assert(test(U"ABCDE", 5)); |
| assert(test(U"a", 1)); |
| #endif |
| |
| #if TEST_STD_VER >= 11 |
| { |
| constexpr std::basic_string_view<char> sv("ABC", 2); |
| static_assert(sv.length() == 2, ""); |
| static_assert(sv.back() == 'B', ""); |
| } |
| #endif |
| |
| return 0; |
| } |