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
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 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
44int main(int, char**) {
45 test(s: "QBCDE");
46 test(s: "A");
47 test(s: "");
48
49#ifndef TEST_HAS_NO_WIDE_CHARACTERS
50 test(s: L"QBCDE");
51 test(s: L"A");
52 test(s: 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

source code of libcxx/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp