1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14) 10 11 // <string_view> 12 13 // constexpr basic_string_view(const _CharT* _s) 14 // : __data (_s), __size(_Traits::length(_s)) {} 15 16 #include <string_view> 17 #include <string> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "constexpr_char_traits.h" 22 23 template <typename CharT> StrLen(const CharT * s)24size_t StrLen(const CharT* s) { 25 std::size_t retVal = 0; 26 while (*s != 0) { 27 ++retVal; 28 ++s; 29 } 30 return retVal; 31 } 32 33 template <typename CharT> test(const CharT * s)34void test(const CharT* s) { 35 typedef std::basic_string_view<CharT> SV; 36 // I'd love to do this, but it would require traits::length() to be noexcept 37 // LIBCPP_ASSERT_NOEXCEPT(SV(s)); 38 39 SV sv1(s); 40 assert(sv1.size() == StrLen(s)); 41 assert(sv1.data() == s); 42 } 43 main(int,char **)44int main(int, char**) { 45 test("QBCDE"); 46 test("A"); 47 test(""); 48 49 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 50 test(L"QBCDE"); 51 test(L"A"); 52 test(L""); 53 #endif 54 55 #if TEST_STD_VER >= 11 56 test(u"QBCDE"); 57 test(u"A"); 58 test(u""); 59 60 test(U"QBCDE"); 61 test(U"A"); 62 test(U""); 63 #endif 64 65 #if TEST_STD_VER > 11 66 { 67 constexpr std::basic_string_view<char, constexpr_char_traits<char>> sv1("ABCDE"); 68 static_assert(sv1.size() == 5, ""); 69 } 70 #endif 71 72 return 0; 73 } 74