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
19TEST_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
27template <class S, class SV>
28TEST_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
33template <class CharT, template <class> class Alloc>
34TEST_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
56TEST_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
65int main(int, char**) {
66 test();
67#if TEST_STD_VER > 17
68 static_assert(test());
69#endif
70
71 return 0;
72}
73

source code of libcxx/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp