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, class Allocator>
13 // constexpr bool operator<(const charT* lhs, basic_string_wiew<charT,traits> rhs);
14 // template<class charT, class traits, class Allocator>
15 // constexpr bool operator<(basic_string_wiew<charT,traits> lhs, const charT* rhs);
16
17 #include <string_view>
18 #include <cassert>
19
20 #include "test_macros.h"
21 #include "constexpr_char_traits.hpp"
22
23 template <class S>
24 void
test(const typename S::value_type * lhs,const S & rhs,bool x,bool y)25 test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
26 {
27 assert((lhs < rhs) == x);
28 assert((rhs < lhs) == y);
29 }
30
main()31 int main()
32 {
33 {
34 typedef std::string_view S;
35 test("", S(""), false, false);
36 test("", S("abcde"), true, false);
37 test("", S("abcdefghij"), true, false);
38 test("", S("abcdefghijklmnopqrst"), true, false);
39 test("abcde", S(""), false, true);
40 test("abcde", S("abcde"), false, false);
41 test("abcde", S("abcdefghij"), true, false);
42 test("abcde", S("abcdefghijklmnopqrst"), true, false);
43 test("abcdefghij", S(""), false, true);
44 test("abcdefghij", S("abcde"), false, true);
45 test("abcdefghij", S("abcdefghij"), false, false);
46 test("abcdefghij", S("abcdefghijklmnopqrst"), true, false);
47 test("abcdefghijklmnopqrst", S(""), false, true);
48 test("abcdefghijklmnopqrst", S("abcde"), false, true);
49 test("abcdefghijklmnopqrst", S("abcdefghij"), false, true);
50 test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false, false);
51 }
52
53 #if TEST_STD_VER > 11
54 {
55 typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
56 constexpr SV sv1;
57 constexpr SV sv2 { "abcde", 5 };
58
59 static_assert (!(sv1 < ""), "" );
60 static_assert (!("" < sv1), "" );
61 static_assert ( sv1 < "abcde", "" );
62 static_assert (!("abcde" < sv1), "" );
63
64 static_assert (!(sv2 < ""), "" );
65 static_assert ( "" < sv2, "" );
66 static_assert (!(sv2 < "abcde"), "" );
67 static_assert (!("abcde" < sv2), "" );
68 static_assert ( sv2 < "abcde0", "" );
69 static_assert (!("abcde0" < sv2), "" );
70 }
71 #endif
72 }
73