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// <string_view>
11
12// constexpr const_iterator end() const;
13
14#include <experimental/string_view>
15#include <cassert>
16
17template <class S>
18void
19test(S s)
20{
21    const S& cs = s;
22    typename S::iterator e = s.end();
23    typename S::const_iterator ce1 = cs.end();
24    typename S::const_iterator ce2 = s.cend();
25
26    if (s.empty())
27    {
28        assert(  e ==  s.begin());
29        assert(ce1 == cs.begin());
30        assert(ce2 ==  s.begin());
31    }
32    else
33    {
34        assert(  e !=  s.begin());
35        assert(ce1 != cs.begin());
36        assert(ce2 !=  s.begin());
37    }
38
39    assert(  e -  s.begin() == s.size());
40    assert(ce1 - cs.begin() == cs.size());
41    assert(ce2 - s.cbegin() == s.size());
42
43    assert(  e == ce1);
44    assert(  e == ce2);
45    assert(ce1 == ce2);
46}
47
48
49int main()
50{
51    typedef std::experimental::string_view    string_view;
52    typedef std::experimental::u16string_view u16string_view;
53    typedef std::experimental::u32string_view u32string_view;
54    typedef std::experimental::wstring_view   wstring_view;
55
56    test(string_view   ());
57    test(u16string_view());
58    test(u32string_view());
59    test(wstring_view  ());
60    test(string_view   ( "123"));
61    test(wstring_view  (L"123"));
62#if __cplusplus >= 201103L
63    test(u16string_view{u"123"});
64    test(u32string_view{U"123"});
65#endif
66
67#if _LIBCPP_STD_VER > 11
68    {
69    constexpr string_view       sv { "123", 3 };
70    constexpr u16string_view u16sv {u"123", 3 };
71    constexpr u32string_view u32sv {U"123", 3 };
72    constexpr wstring_view     wsv {L"123", 3 };
73
74    static_assert (    sv.begin() !=    sv.end(), "" );
75    static_assert ( u16sv.begin() != u16sv.end(), "" );
76    static_assert ( u32sv.begin() != u32sv.end(), "" );
77    static_assert (   wsv.begin() !=   wsv.end(), "" );
78
79    static_assert (    sv.begin() !=    sv.cend(), "" );
80    static_assert ( u16sv.begin() != u16sv.cend(), "" );
81    static_assert ( u32sv.begin() != u32sv.cend(), "" );
82    static_assert (   wsv.begin() !=   wsv.cend(), "" );
83    }
84#endif
85}
86