1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <string>
10
11 // int compare(const basic_string& str) const // constexpr since C++20
12
13 #include <string>
14 #include <cassert>
15
16 #include "test_macros.h"
17 #include "min_allocator.h"
18
sign(int x)19 TEST_CONSTEXPR_CXX20 int sign(int x)
20 {
21 if (x == 0)
22 return 0;
23 if (x < 0)
24 return -1;
25 return 1;
26 }
27
28 template <class S>
29 TEST_CONSTEXPR_CXX20 void
test(const S & s,const S & str,int x)30 test(const S& s, const S& str, int x)
31 {
32 LIBCPP_ASSERT_NOEXCEPT(s.compare(str));
33 assert(sign(s.compare(str)) == sign(x));
34 }
35
test()36 TEST_CONSTEXPR_CXX20 bool test() {
37 {
38 typedef std::string S;
39 test(S(""), S(""), 0);
40 test(S(""), S("abcde"), -5);
41 test(S(""), S("abcdefghij"), -10);
42 test(S(""), S("abcdefghijklmnopqrst"), -20);
43 test(S("abcde"), S(""), 5);
44 test(S("abcde"), S("abcde"), 0);
45 test(S("abcde"), S("abcdefghij"), -5);
46 test(S("abcde"), S("abcdefghijklmnopqrst"), -15);
47 test(S("abcdefghij"), S(""), 10);
48 test(S("abcdefghij"), S("abcde"), 5);
49 test(S("abcdefghij"), S("abcdefghij"), 0);
50 test(S("abcdefghij"), S("abcdefghijklmnopqrst"), -10);
51 test(S("abcdefghijklmnopqrst"), S(""), 20);
52 test(S("abcdefghijklmnopqrst"), S("abcde"), 15);
53 test(S("abcdefghijklmnopqrst"), S("abcdefghij"), 10);
54 test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), 0);
55 }
56 #if TEST_STD_VER >= 11
57 {
58 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
59 test(S(""), S(""), 0);
60 test(S(""), S("abcde"), -5);
61 test(S(""), S("abcdefghij"), -10);
62 test(S(""), S("abcdefghijklmnopqrst"), -20);
63 test(S("abcde"), S(""), 5);
64 test(S("abcde"), S("abcde"), 0);
65 test(S("abcde"), S("abcdefghij"), -5);
66 test(S("abcde"), S("abcdefghijklmnopqrst"), -15);
67 test(S("abcdefghij"), S(""), 10);
68 test(S("abcdefghij"), S("abcde"), 5);
69 test(S("abcdefghij"), S("abcdefghij"), 0);
70 test(S("abcdefghij"), S("abcdefghijklmnopqrst"), -10);
71 test(S("abcdefghijklmnopqrst"), S(""), 20);
72 test(S("abcdefghijklmnopqrst"), S("abcde"), 15);
73 test(S("abcdefghijklmnopqrst"), S("abcdefghij"), 10);
74 test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), 0);
75 }
76 #endif
77
78 #if TEST_STD_VER > 3
79 { // LWG 2946
80 std::string s = " !";
81 assert(s.compare({"abc", 1}) < 0);
82 }
83 #endif
84
85 return true;
86 }
87
main(int,char **)88 int main(int, char**)
89 {
90 test();
91 #if TEST_STD_VER > 17
92 static_assert(test());
93 #endif
94
95 return 0;
96 }
97