74 lines · cpp
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-exception6//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 23template <typename CharT>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 33template <typename CharT>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 noexcept37 // LIBCPP_ASSERT_NOEXCEPT(SV(s));38 39 SV sv1(s);40 assert(sv1.size() == StrLen(s));41 assert(sv1.data() == s);42}43 44int main(int, char**) {45 test("QBCDE");46 test("A");47 test("");48 49#ifndef TEST_HAS_NO_WIDE_CHARACTERS50 test(L"QBCDE");51 test(L"A");52 test(L"");53#endif54 55#if TEST_STD_VER >= 1156 test(u"QBCDE");57 test(u"A");58 test(u"");59 60 test(U"QBCDE");61 test(U"A");62 test(U"");63#endif64 65#if TEST_STD_VER > 1166 {67 constexpr std::basic_string_view<char, constexpr_char_traits<char>> sv1("ABCDE");68 static_assert(sv1.size() == 5, "");69 }70#endif71 72 return 0;73}74