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 <experimental/string_view>
18 #include <cassert>
19
20 #include "constexpr_char_traits.hpp"
21
22 template <class S>
23 void
test(const typename S::value_type * lhs,const S & rhs,bool x,bool y)24 test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
25 {
26 assert((lhs <= rhs) == x);
27 assert((rhs <= lhs) == y);
28 }
29
main()30 int main()
31 {
32 {
33 typedef std::experimental::string_view S;
34 test("", S(""), true, true);
35 test("", S("abcde"), true, false);
36 test("", S("abcdefghij"), true, false);
37 test("", S("abcdefghijklmnopqrst"), true, false);
38 test("abcde", S(""), false, true);
39 test("abcde", S("abcde"), true, true);
40 test("abcde", S("abcdefghij"), true, false);
41 test("abcde", S("abcdefghijklmnopqrst"), true, false);
42 test("abcdefghij", S(""), false, true);
43 test("abcdefghij", S("abcde"), false, true);
44 test("abcdefghij", S("abcdefghij"), true, true);
45 test("abcdefghij", S("abcdefghijklmnopqrst"), true, false);
46 test("abcdefghijklmnopqrst", S(""), false, true);
47 test("abcdefghijklmnopqrst", S("abcde"), false, true);
48 test("abcdefghijklmnopqrst", S("abcdefghij"), false, true);
49 test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true, 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
58 static_assert ( sv1 <= "", "" );
59 static_assert ( "" <= sv1, "" );
60 static_assert ( sv1 <= "abcde", "" );
61 static_assert (!("abcde" <= sv1), "" );
62
63 static_assert (!(sv2 <= ""), "" );
64 static_assert ( "" <= sv2, "" );
65 static_assert ( sv2 <= "abcde", "" );
66 static_assert ( "abcde" <= sv2, "" );
67 static_assert ( sv2 <= "abcde0", "" );
68 static_assert (!("abcde0" <= sv2), "" );
69 }
70 #endif
71 }
72