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>
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
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 
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