//===----------------------------------------------------------------------===// // // 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) // // constexpr const_iterator begin() const; #include #include #include "test_macros.h" template void test(S s) { const S& cs = s; typename S::iterator b = s.begin(); typename S::const_iterator cb1 = cs.begin(); typename S::const_iterator cb2 = s.cbegin(); if (!s.empty()) { assert(*b == s[0]); assert(&*b == &s[0]); assert(*cb1 == s[0]); assert(&*cb1 == &s[0]); assert(*cb2 == s[0]); assert(&*cb2 == &s[0]); } assert(b == cb1); assert(b == cb2); assert(cb1 == cb2); } 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 > 11 { 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.begin() == sv[0], ""); # ifndef TEST_HAS_NO_CHAR8_T static_assert(*u8sv.begin() == u8sv[0], ""); # endif static_assert(*u16sv.begin() == u16sv[0], ""); static_assert(*u32sv.begin() == u32sv[0], ""); static_assert(*sv.cbegin() == sv[0], ""); # ifndef TEST_HAS_NO_CHAR8_T static_assert(*u8sv.cbegin() == u8sv[0], ""); # endif static_assert(*u16sv.cbegin() == u16sv[0], ""); static_assert(*u32sv.cbegin() == u32sv[0], ""); # ifndef TEST_HAS_NO_WIDE_CHARACTERS { constexpr wstring_view wsv{L"123", 3}; static_assert(*wsv.begin() == wsv[0], ""); static_assert(*wsv.cbegin() == wsv[0], ""); } # endif } #endif // TEST_STD_VER > 11 return 0; }