1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10
11// <string_view>
12
13// void swap(basic_string_view& _other) noexcept
14
15#include <string_view>
16#include <cassert>
17
18#include "test_macros.h"
19
20template<typename CharT>
21void test ( const CharT *s, size_t len ) {
22    typedef std::basic_string_view<CharT> SV;
23    {
24    SV sv1(s);
25    SV sv2;
26
27    assert ( sv1.size() == len );
28    assert ( sv1.data() == s );
29    assert ( sv2.size() == 0 );
30
31    sv1.swap ( sv2 );
32    assert ( sv1.size() == 0 );
33    assert ( sv2.size() == len );
34    assert ( sv2.data() == s );
35    }
36
37}
38
39#if TEST_STD_VER > 11
40constexpr size_t test_ce ( size_t n, size_t k ) {
41    typedef std::basic_string_view<char> SV;
42    SV sv1{ "ABCDEFGHIJKL", n };
43    SV sv2 { sv1.data(), k };
44    sv1.swap ( sv2 );
45    return sv1.size();
46}
47#endif
48
49
50int main () {
51    test ( "ABCDE", 5 );
52    test ( "a", 1 );
53    test ( "", 0 );
54
55    test ( L"ABCDE", 5 );
56    test ( L"a", 1 );
57    test ( L"", 0 );
58
59#if TEST_STD_VER >= 11
60    test ( u"ABCDE", 5 );
61    test ( u"a", 1 );
62    test ( u"", 0 );
63
64    test ( U"ABCDE", 5 );
65    test ( U"a", 1 );
66    test ( U"", 0 );
67#endif
68
69#if TEST_STD_VER > 11
70    {
71    static_assert ( test_ce (2, 3) == 3, "" );
72    static_assert ( test_ce (5, 3) == 3, "" );
73    static_assert ( test_ce (0, 1) == 1, "" );
74    }
75#endif
76}
77