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>
11 
12 // template<class charT, class traits>
13 //   constexpr bool operator==(basic_string_view<charT,traits> lhs, const charT* rhs);
14 // template<class charT, class traits>
15 //   constexpr bool operator==(const charT* lhs, basic_string_view<charT,traits> rhs);
16 
17 #include <experimental/string_view>
18 #include <cassert>
19 
20 #include "constexpr_char_traits.hpp"
21 
22 template <class S>
23 void
test(S lhs,const typename S::value_type * rhs,bool x)24 test(S lhs, const typename S::value_type* rhs, bool x)
25 {
26     assert((lhs == rhs) == x);
27     assert((rhs == lhs) == x);
28 }
29 
main()30 int main()
31 {
32     {
33     typedef std::experimental::string_view S;
34     test(S(""), "", true);
35     test(S(""), "abcde", false);
36     test(S(""), "abcdefghij", false);
37     test(S(""), "abcdefghijklmnopqrst", false);
38     test(S("abcde"), "", false);
39     test(S("abcde"), "abcde", true);
40     test(S("abcde"), "abcdefghij", false);
41     test(S("abcde"), "abcdefghijklmnopqrst", false);
42     test(S("abcdefghij"), "", false);
43     test(S("abcdefghij"), "abcde", false);
44     test(S("abcdefghij"), "abcdefghij", true);
45     test(S("abcdefghij"), "abcdefghijklmnopqrst", false);
46     test(S("abcdefghijklmnopqrst"), "", false);
47     test(S("abcdefghijklmnopqrst"), "abcde", false);
48     test(S("abcdefghijklmnopqrst"), "abcdefghij", false);
49     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true);
50     }
51 
52 #if _LIBCPP_STD_VER > 11
53     {
54     typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
55     constexpr SV  sv1;
56     constexpr SV  sv2 { "abcde", 5 };
57     static_assert (  sv1     == "", "" );
58     static_assert (  ""      == sv1, "" );
59     static_assert (!(sv1     == "abcde"), "" );
60     static_assert (!("abcde" == sv1), "" );
61 
62     static_assert (  sv2      == "abcde", "" );
63     static_assert (  "abcde"  == sv2, "" );
64     static_assert (!(sv2      == "abcde0"), "" );
65     static_assert (!("abcde0" == sv2), "" );
66     }
67 #endif
68 }
69