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 // <string_view>
10
11 // constexpr const _CharT& at(size_type _pos) const;
12
13 #include <string_view>
14 #include <stdexcept>
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 std::basic_string_view<CharT> sv ( s, len );
22 assert ( sv.length() == len );
23 for ( size_t i = 0; i < len; ++i ) {
24 assert ( sv.at(i) == s[i] );
25 assert ( &sv.at(i) == s + i );
26 }
27
28 #ifndef TEST_HAS_NO_EXCEPTIONS
29 try { (void)sv.at(len); } catch ( const std::out_of_range & ) { return ; }
30 assert ( false );
31 #endif
32 }
33
main(int,char **)34 int main(int, char**) {
35 test ( "ABCDE", 5 );
36 test ( "a", 1 );
37
38 test ( L"ABCDE", 5 );
39 test ( L"a", 1 );
40
41 #if TEST_STD_VER >= 11
42 test ( u"ABCDE", 5 );
43 test ( u"a", 1 );
44
45 test ( U"ABCDE", 5 );
46 test ( U"a", 1 );
47 #endif
48
49 #if TEST_STD_VER >= 11
50 {
51 constexpr std::basic_string_view<char> sv ( "ABC", 2 );
52 static_assert ( sv.length() == 2, "" );
53 static_assert ( sv.at(0) == 'A', "" );
54 static_assert ( sv.at(1) == 'B', "" );
55 }
56 #endif
57
58 return 0;
59 }
60