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
10 // <string_view>
11
12 // constexpr const _CharT& operator[](size_type _pos) const;
13
14 #include <string_view>
15 #include <cassert>
16
17 #include "test_macros.h"
18
19 template <typename CharT>
test(const CharT * s,size_t len)20 void test ( const CharT *s, size_t len ) {
21 typedef std::basic_string_view<CharT> SV;
22 SV sv ( s, len );
23 ASSERT_SAME_TYPE(decltype(sv[0]), typename SV::const_reference);
24 LIBCPP_ASSERT_NOEXCEPT( sv[0]);
25 assert ( sv.length() == len );
26 for ( size_t i = 0; i < len; ++i ) {
27 assert ( sv[i] == s[i] );
28 assert ( &sv[i] == s + i );
29 }
30 }
31
main(int,char **)32 int main(int, char**) {
33 test ( "ABCDE", 5 );
34 test ( "a", 1 );
35
36 test ( L"ABCDE", 5 );
37 test ( L"a", 1 );
38
39 #if TEST_STD_VER >= 11
40 test ( u"ABCDE", 5 );
41 test ( u"a", 1 );
42
43 test ( U"ABCDE", 5 );
44 test ( U"a", 1 );
45 #endif
46
47 #if TEST_STD_VER > 11
48 {
49 constexpr std::basic_string_view<char> sv ( "ABC", 2 );
50 static_assert ( sv.length() == 2, "" );
51 static_assert ( sv[0] == 'A', "" );
52 static_assert ( sv[1] == 'B', "" );
53 }
54 #endif
55
56 return 0;
57 }
58