swap.pass.cpp revision 06086258d3d8c48a916ec51c33e1ad8f46821b81 
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 <experimental/string_view>
16#include <cassert>
17
18template<typename CharT>
19void test ( const CharT *s, size_t len ) {
20    typedef std::experimental::basic_string_view<CharT> SV;
21    {
22    SV sv1(s);
23    SV sv2;
24
25    assert ( sv1.size() == len );
26    assert ( sv1.data() == s );
27    assert ( sv2.size() == 0 );
28
29    sv1.swap ( sv2 );
30    assert ( sv1.size() == 0 );
31    assert ( sv2.size() == len );
32    assert ( sv2.data() == s );
33    }
34
35}
36
37#if _LIBCPP_STD_VER > 11
38constexpr size_t test_ce ( size_t n, size_t k ) {
39    typedef std::experimental::basic_string_view<char> SV;
40    SV sv1{ "ABCDEFGHIJKL", n };
41    SV sv2 { sv1.data(), k };
42    sv1.swap ( sv2 );
43    return sv1.size();
44}
45#endif
46
47
48int main () {
49    test ( "ABCDE", 5 );
50    test ( "a", 1 );
51    test ( "", 0 );
52
53    test ( L"ABCDE", 5 );
54    test ( L"a", 1 );
55    test ( L"", 0 );
56
57#if __cplusplus >= 201103L
58    test ( u"ABCDE", 5 );
59    test ( u"a", 1 );
60    test ( u"", 0 );
61
62    test ( U"ABCDE", 5 );
63    test ( U"a", 1 );
64    test ( U"", 0 );
65#endif
66
67#if _LIBCPP_STD_VER > 11
68    {
69    static_assert ( test_ce (2, 3) == 3, "" );
70    static_assert ( test_ce (5, 3) == 3, "" );
71    static_assert ( test_ce (0, 1) == 1, "" );
72    }
73#endif
74}
75