| //===----------------------------------------------------------------------===// |
| // |
| // 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_iterator rend() const; |
| |
| #include <string_view> |
| #include <cassert> |
| #include <cstddef> |
| |
| #include "test_macros.h" |
| |
| template <class S> |
| void test(S s) { |
| const S& cs = s; |
| typename S::reverse_iterator e = s.rend(); |
| typename S::const_reverse_iterator ce1 = cs.rend(); |
| typename S::const_reverse_iterator ce2 = s.crend(); |
| |
| if (s.empty()) { |
| assert(e == s.rbegin()); |
| assert(ce1 == cs.rbegin()); |
| assert(ce2 == s.rbegin()); |
| } else { |
| assert(e != s.rbegin()); |
| assert(ce1 != cs.rbegin()); |
| assert(ce2 != s.rbegin()); |
| } |
| |
| assert(static_cast<std::size_t>(e - s.rbegin()) == s.size()); |
| assert(static_cast<std::size_t>(ce1 - cs.rbegin()) == cs.size()); |
| assert(static_cast<std::size_t>(ce2 - s.crbegin()) == s.size()); |
| |
| assert(e == ce1); |
| assert(e == ce2); |
| assert(ce1 == ce2); |
| } |
| |
| int main(int, char**) { |
| typedef std::string_view string_view; |
| #ifndef TEST_HAS_NO_CHAR8_T |
| typedef std::u8string_view u8string_view; |
| #endif |
| typedef std::u16string_view u16string_view; |
| typedef std::u32string_view u32string_view; |
| |
| test(string_view()); |
| test(u16string_view()); |
| test(u32string_view()); |
| test(string_view("123")); |
| #ifndef TEST_HAS_NO_CHAR8_T |
| test(u8string_view{u8"123"}); |
| #endif |
| #if TEST_STD_VER >= 11 |
| test(u16string_view{u"123"}); |
| test(u32string_view{U"123"}); |
| #endif |
| |
| #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| typedef std::wstring_view wstring_view; |
| test(wstring_view()); |
| test(wstring_view(L"123")); |
| #endif |
| |
| #if TEST_STD_VER > 14 |
| { |
| constexpr string_view sv{"123", 3}; |
| # ifndef TEST_HAS_NO_CHAR8_T |
| constexpr u8string_view u8sv{u8"123", 3}; |
| # endif |
| constexpr u16string_view u16sv{u"123", 3}; |
| constexpr u32string_view u32sv{U"123", 3}; |
| |
| static_assert(*--sv.rend() == sv[0], ""); |
| # ifndef TEST_HAS_NO_CHAR8_T |
| static_assert(*--u8sv.rend() == u8sv[0], ""); |
| # endif |
| static_assert(*--u16sv.rend() == u16sv[0], ""); |
| static_assert(*--u32sv.rend() == u32sv[0], ""); |
| |
| static_assert(*--sv.crend() == sv[0], ""); |
| # ifndef TEST_HAS_NO_CHAR8_T |
| static_assert(*--u8sv.crend() == u8sv[0], ""); |
| # endif |
| static_assert(*--u16sv.crend() == u16sv[0], ""); |
| static_assert(*--u32sv.crend() == u32sv[0], ""); |
| |
| # ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| { |
| constexpr wstring_view wsv{L"123", 3}; |
| static_assert(*--wsv.rend() == wsv[0], ""); |
| static_assert(*--wsv.crend() == wsv[0], ""); |
| } |
| # endif |
| } |
| #endif // TEST_STD_VER > 14 |
| |
| return 0; |
| } |