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<class charT, class traits, class Allocator>
12 // bool operator!=(const basic_string<charT,traits,Allocator>& lhs, const charT* rhs); // constexpr since C++20
13
14 #include <string>
15 #include <cassert>
16
17 #include "test_macros.h"
18 #include "min_allocator.h"
19
20 template <class S>
test(const S & lhs,const typename S::value_type * rhs,bool x)21 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const typename S::value_type* rhs, bool x) {
22 assert((lhs != rhs) == x);
23 }
24
25 template <class S>
test_string()26 TEST_CONSTEXPR_CXX20 void test_string() {
27 test(S(""), "", false);
28 test(S(""), "abcde", true);
29 test(S(""), "abcdefghij", true);
30 test(S(""), "abcdefghijklmnopqrst", true);
31 test(S("abcde"), "", true);
32 test(S("abcde"), "abcde", false);
33 test(S("abcde"), "abcdefghij", true);
34 test(S("abcde"), "abcdefghijklmnopqrst", true);
35 test(S("abcdefghij"), "", true);
36 test(S("abcdefghij"), "abcde", true);
37 test(S("abcdefghij"), "abcdefghij", false);
38 test(S("abcdefghij"), "abcdefghijklmnopqrst", true);
39 test(S("abcdefghijklmnopqrst"), "", true);
40 test(S("abcdefghijklmnopqrst"), "abcde", true);
41 test(S("abcdefghijklmnopqrst"), "abcdefghij", true);
42 test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false);
43 }
44
test()45 TEST_CONSTEXPR_CXX20 bool test() {
46 test_string<std::string>();
47 #if TEST_STD_VER >= 11
48 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
49 #endif
50
51 return true;
52 }
53
main(int,char **)54 int main(int, char**) {
55 test();
56 #if TEST_STD_VER > 17
57 static_assert(test());
58 #endif
59
60 return 0;
61 }
62