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// template<> struct char_traits<char32_t>
12
13// static int compare(const char_type* s1, const char_type* s2, size_t n);
14// constexpr in C++17
15
16#include <string>
17#include <cassert>
18
19#include "test_macros.h"
20
21#if TEST_STD_VER > 14
22constexpr bool test_constexpr() {
23 return std::char_traits<char32_t>::compare(U"123", U"223", 3) < 0 &&
24 std::char_traits<char32_t>::compare(U"223", U"123", 3) > 0 &&
25 std::char_traits<char32_t>::compare(U"123", U"123", 3) == 0;
26}
27#endif
28
29int main(int, char**) {
30#if TEST_STD_VER >= 11
31 assert(std::char_traits<char32_t>::compare(U"", U"", 0) == 0);
32 assert(std::char_traits<char32_t>::compare(NULL, NULL, 0) == 0);
33
34 assert(std::char_traits<char32_t>::compare(U"1", U"1", 1) == 0);
35 assert(std::char_traits<char32_t>::compare(U"1", U"2", 1) < 0);
36 assert(std::char_traits<char32_t>::compare(U"2", U"1", 1) > 0);
37
38 assert(std::char_traits<char32_t>::compare(U"12", U"12", 2) == 0);
39 assert(std::char_traits<char32_t>::compare(U"12", U"13", 2) < 0);
40 assert(std::char_traits<char32_t>::compare(U"12", U"22", 2) < 0);
41 assert(std::char_traits<char32_t>::compare(U"13", U"12", 2) > 0);
42 assert(std::char_traits<char32_t>::compare(U"22", U"12", 2) > 0);
43
44 assert(std::char_traits<char32_t>::compare(U"123", U"123", 3) == 0);
45 assert(std::char_traits<char32_t>::compare(U"123", U"223", 3) < 0);
46 assert(std::char_traits<char32_t>::compare(U"123", U"133", 3) < 0);
47 assert(std::char_traits<char32_t>::compare(U"123", U"124", 3) < 0);
48 assert(std::char_traits<char32_t>::compare(U"223", U"123", 3) > 0);
49 assert(std::char_traits<char32_t>::compare(U"133", U"123", 3) > 0);
50 assert(std::char_traits<char32_t>::compare(U"124", U"123", 3) > 0);
51#endif
52
53#if TEST_STD_VER > 14
54 static_assert(test_constexpr(), "");
55#endif
56
57 return 0;
58}
59

source code of libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/compare.pass.cpp