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 // void swap(basic_string_view& _other) noexcept
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 {
23 SV sv1(s);
24 SV sv2;
25
26 assert ( sv1.size() == len );
27 assert ( sv1.data() == s );
28 assert ( sv2.size() == 0 );
29
30 sv1.swap ( sv2 );
31 assert ( sv1.size() == 0 );
32 assert ( sv2.size() == len );
33 assert ( sv2.data() == s );
34 }
35
36 }
37
38 #if TEST_STD_VER > 11
test_ce(size_t n,size_t k)39 constexpr size_t test_ce ( size_t n, size_t k ) {
40 typedef std::basic_string_view<char> SV;
41 SV sv1{ "ABCDEFGHIJKL", n };
42 SV sv2 { sv1.data(), k };
43 sv1.swap ( sv2 );
44 return sv1.size();
45 }
46 #endif
47
48
main(int,char **)49 int main(int, char**) {
50 test ( "ABCDE", 5 );
51 test ( "a", 1 );
52 test ( "", 0 );
53
54 test ( L"ABCDE", 5 );
55 test ( L"a", 1 );
56 test ( L"", 0 );
57
58 #if TEST_STD_VER >= 11
59 test ( u"ABCDE", 5 );
60 test ( u"a", 1 );
61 test ( u"", 0 );
62
63 test ( U"ABCDE", 5 );
64 test ( U"a", 1 );
65 test ( U"", 0 );
66 #endif
67
68 #if TEST_STD_VER > 11
69 {
70 static_assert ( test_ce (2, 3) == 3, "" );
71 static_assert ( test_ce (5, 3) == 3, "" );
72 static_assert ( test_ce (0, 1) == 1, "" );
73 }
74 #endif
75
76 return 0;
77 }
78