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
23template <class S>
24void
25test(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
31int 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