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<wchar_t>
12
13// static int compare(const char_type* s1, const char_type* s2, size_t n);
14// constexpr in C++17
15
16// UNSUPPORTED: no-wide-characters
17
18#include <string>
19#include <cassert>
20
21#include "test_macros.h"
22
23#if TEST_STD_VER > 14
24constexpr bool test_constexpr() {
25 return std::char_traits<wchar_t>::compare(L"123", L"223", 3) < 0 &&
26 std::char_traits<wchar_t>::compare(L"223", L"123", 3) > 0 &&
27 std::char_traits<wchar_t>::compare(L"123", L"123", 3) == 0;
28}
29#endif
30
31int main(int, char**) {
32 assert(std::char_traits<wchar_t>::compare(L"", L"", 0) == 0);
33 assert(std::char_traits<wchar_t>::compare(NULL, NULL, 0) == 0);
34
35 assert(std::char_traits<wchar_t>::compare(L"1", L"1", 1) == 0);
36 assert(std::char_traits<wchar_t>::compare(L"1", L"2", 1) < 0);
37 assert(std::char_traits<wchar_t>::compare(L"2", L"1", 1) > 0);
38
39 assert(std::char_traits<wchar_t>::compare(L"12", L"12", 2) == 0);
40 assert(std::char_traits<wchar_t>::compare(L"12", L"13", 2) < 0);
41 assert(std::char_traits<wchar_t>::compare(L"12", L"22", 2) < 0);
42 assert(std::char_traits<wchar_t>::compare(L"13", L"12", 2) > 0);
43 assert(std::char_traits<wchar_t>::compare(L"22", L"12", 2) > 0);
44
45 assert(std::char_traits<wchar_t>::compare(L"123", L"123", 3) == 0);
46 assert(std::char_traits<wchar_t>::compare(L"123", L"223", 3) < 0);
47 assert(std::char_traits<wchar_t>::compare(L"123", L"133", 3) < 0);
48 assert(std::char_traits<wchar_t>::compare(L"123", L"124", 3) < 0);
49 assert(std::char_traits<wchar_t>::compare(L"223", L"123", 3) > 0);
50 assert(std::char_traits<wchar_t>::compare(L"133", L"123", 3) > 0);
51 assert(std::char_traits<wchar_t>::compare(L"124", L"123", 3) > 0);
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.wchar_t/compare.pass.cpp