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 const _CharT& operator[](size_type _pos) const;
14
15 #include <string_view>
16 #include <cassert>
17
18 #include "test_macros.h"
19
20 template <typename CharT>
test(const CharT * s,size_t len)21 void test ( const CharT *s, size_t len ) {
22 typedef std::basic_string_view<CharT> SV;
23 SV sv ( s, len );
24 ASSERT_SAME_TYPE(decltype(sv[0]), typename SV::const_reference);
25 LIBCPP_ASSERT_NOEXCEPT( sv[0]);
26 assert ( sv.length() == len );
27 for ( size_t i = 0; i < len; ++i ) {
28 assert ( sv[i] == s[i] );
29 assert ( &sv[i] == s + i );
30 }
31 }
32
main(int,char **)33 int main(int, char**) {
34 test ( "ABCDE", 5 );
35 test ( "a", 1 );
36
37 test ( L"ABCDE", 5 );
38 test ( L"a", 1 );
39
40 #if TEST_STD_VER >= 11
41 test ( u"ABCDE", 5 );
42 test ( u"a", 1 );
43
44 test ( U"ABCDE", 5 );
45 test ( U"a", 1 );
46 #endif
47
48 #if TEST_STD_VER > 11
49 {
50 constexpr std::basic_string_view<char> sv ( "ABC", 2 );
51 static_assert ( sv.length() == 2, "" );
52 static_assert ( sv[0] == 'A', "" );
53 static_assert ( sv[1] == 'B', "" );
54 }
55 #endif
56
57 return 0;
58 }
59