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 // void resize(size_type n); // constexpr since C++20
12
13 #include <string>
14 #include <stdexcept>
15 #include <cassert>
16
17 #include "test_macros.h"
18 #include "min_allocator.h"
19 #include "asan_testing.h"
20
21 template <class S>
test(S s,typename S::size_type n,S expected)22 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type n, S expected) {
23 if (n <= s.max_size()) {
24 s.resize(n);
25 LIBCPP_ASSERT(s.__invariants());
26 assert(s == expected);
27 LIBCPP_ASSERT(is_string_asan_correct(s));
28 }
29 #ifndef TEST_HAS_NO_EXCEPTIONS
30 else if (!TEST_IS_CONSTANT_EVALUATED) {
31 try {
32 s.resize(n);
33 assert(false);
34 } catch (std::length_error&) {
35 assert(n > s.max_size());
36 }
37 }
38 #endif
39 }
40
41 template <class S>
test_string()42 TEST_CONSTEXPR_CXX20 void test_string() {
43 test(S(), 0, S());
44 test(S(), 1, S(1, '\0'));
45 test(S(), 10, S(10, '\0'));
46 test(S(), 100, S(100, '\0'));
47 test(S("12345"), 0, S());
48 test(S("12345"), 2, S("12"));
49 test(S("12345"), 5, S("12345"));
50 test(S("12345"), 15, S("12345\0\0\0\0\0\0\0\0\0\0", 15));
51 test(S("12345678901234567890123456789012345678901234567890"), 0, S());
52 test(S("12345678901234567890123456789012345678901234567890"), 10, S("1234567890"));
53 test(S("12345678901234567890123456789012345678901234567890"),
54 50,
55 S("12345678901234567890123456789012345678901234567890"));
56 test(S("12345678901234567890123456789012345678901234567890"),
57 60,
58 S("12345678901234567890123456789012345678901234567890\0\0\0\0\0\0\0\0\0\0", 60));
59 test(S(), S::npos, S("not going to happen"));
60 }
61
test()62 TEST_CONSTEXPR_CXX20 bool test() {
63 test_string<std::string>();
64 #if TEST_STD_VER >= 11
65 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
66 test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char>>>();
67 #endif
68
69 return true;
70 }
71
main(int,char **)72 int main(int, char**) {
73 test();
74 #if TEST_STD_VER > 17
75 static_assert(test());
76 #endif
77
78 return 0;
79 }
80