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// Starting with C++20 the spaceship operator was included. This tests
10// comparison in that context, thus doesn't support older language versions.
11// These are tested per operator.
12
13// UNSUPPORTED: c++03, c++11, c++14, c++17
14
15// <string>
16
17// template<class charT, class traits, class Allocator>
18// see below operator<=>(const basic_string<charT, traits, Allocator>& lhs,
19// const basic_string<charT, traits, Allocator>& rhs) noexcept;
20// template<class charT, class traits, class Allocator>
21// see below operator<=>(const basic_string<charT, traits, Allocator>& lhs,
22// const charT* rhs);
23
24#include <string>
25
26#include <array>
27#include <cassert>
28#include <string_view>
29
30#include "constexpr_char_traits.h"
31#include "make_string.h"
32#include "test_comparisons.h"
33#include "test_macros.h"
34
35#define STR(S) MAKE_STRING(CharT, S)
36
37template <class T, class Ordering = std::strong_ordering>
38constexpr void test() {
39 AssertOrderAreNoexcept<T>();
40 AssertOrderReturn<Ordering, T>();
41
42 using CharT = typename T::value_type;
43 AssertOrderReturn<Ordering, T, const CharT*>();
44
45 // sorted values
46 std::array v{
47 STR(""),
48 STR("abc"),
49 STR("abcdef"),
50 STR("acb"),
51 };
52
53 // sorted values with embedded NUL character
54 std::array vn{
55 STR("abc"),
56 STR("abc\0"),
57 STR("abc\0def"),
58 STR("acb\0"),
59 };
60 static_assert(v.size() == vn.size());
61
62 for (std::size_t i = 0; i < v.size(); ++i) {
63 for (std::size_t j = 0; j < v.size(); ++j) {
64 assert(testOrder(v[i], v[j], i == j ? Ordering::equivalent : i < j ? Ordering::less : Ordering::greater));
65
66 assert(testOrder(
67 v[i],
68 std::basic_string<CharT>{v[j]}.c_str(),
69 i == j ? Ordering::equivalent
70 : i < j ? Ordering::less
71 : Ordering::greater));
72
73 // NUL test omitted for c-strings since it will fail.
74 assert(testOrder(vn[i], vn[j], i == j ? Ordering::equivalent : i < j ? Ordering::less : Ordering::greater));
75 }
76 }
77}
78
79constexpr bool test_all_types() {
80 test<std::string>();
81 test<std::basic_string<char, constexpr_char_traits<char>>, std::weak_ordering>();
82#ifndef TEST_HAS_NO_WIDE_CHARACTERS
83 test<std::wstring>();
84 test<std::basic_string<wchar_t, constexpr_char_traits<wchar_t>>, std::weak_ordering>();
85#endif
86 test<std::u8string>();
87 test<std::basic_string<char8_t, constexpr_char_traits<char8_t>>, std::weak_ordering>();
88 test<std::u16string>();
89 test<std::basic_string<char16_t, constexpr_char_traits<char16_t>>, std::weak_ordering>();
90 test<std::u32string>();
91 test<std::basic_string<char32_t, constexpr_char_traits<char32_t>>, std::weak_ordering>();
92
93 return true;
94}
95
96int main(int, char**) {
97 test_all_types();
98 static_assert(test_all_types());
99
100 return 0;
101}
102

source code of libcxx/test/std/strings/basic.string/string.nonmembers/string.cmp/comparison.pass.cpp