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_view sv) 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 if (x == 0)
21 return 0;
22 if (x < 0)
23 return -1;
24 return 1;
25 }
26
27 template <class S, class SV>
test(const S & s,SV sv,int x)28 TEST_CONSTEXPR_CXX20 void test(const S& s, SV sv, int x) {
29 LIBCPP_ASSERT_NOEXCEPT(s.compare(sv));
30 assert(sign(s.compare(sv)) == sign(x));
31 }
32
33 template <class CharT, template <class> class Alloc>
test_string()34 TEST_CONSTEXPR_CXX20 void test_string() {
35 using S = std::basic_string<CharT, std::char_traits<CharT>, Alloc<CharT> >;
36 using SV = std::basic_string_view<CharT, std::char_traits<CharT> >;
37
38 test(S(""), SV(""), 0);
39 test(S(""), SV("abcde"), -5);
40 test(S(""), SV("abcdefghij"), -10);
41 test(S(""), SV("abcdefghijklmnopqrst"), -20);
42 test(S("abcde"), SV(""), 5);
43 test(S("abcde"), SV("abcde"), 0);
44 test(S("abcde"), SV("abcdefghij"), -5);
45 test(S("abcde"), SV("abcdefghijklmnopqrst"), -15);
46 test(S("abcdefghij"), SV(""), 10);
47 test(S("abcdefghij"), SV("abcde"), 5);
48 test(S("abcdefghij"), SV("abcdefghij"), 0);
49 test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), -10);
50 test(S("abcdefghijklmnopqrst"), SV(""), 20);
51 test(S("abcdefghijklmnopqrst"), SV("abcde"), 15);
52 test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), 10);
53 test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), 0);
54 }
55
test()56 TEST_CONSTEXPR_CXX20 bool test() {
57 test_string<char, std::allocator>();
58 #if TEST_STD_VER >= 11
59 test_string<char, min_allocator>();
60 #endif
61
62 return true;
63 }
64
main(int,char **)65 int main(int, char**) {
66 test();
67 #if TEST_STD_VER > 17
68 static_assert(test());
69 #endif
70
71 return 0;
72 }
73