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 "asan_testing.h"
18#include "make_string.h"
19#include "min_allocator.h"
20#include "test_macros.h"
21
22template <class S>
23TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type n, S expected) {
24 s.resize(n);
25 LIBCPP_ASSERT(s.__invariants());
26 assert(s == expected);
27 LIBCPP_ASSERT(is_string_asan_correct(s));
28}
29
30template <class CharT, class Alloc>
31TEST_CONSTEXPR_CXX20 void test_string() {
32 {
33 using string_type = std::basic_string<CharT, std::char_traits<CharT>, Alloc>;
34 test(string_type(), 0, string_type());
35 test(string_type(), 1, string_type(1, '\0'));
36 test(string_type(), 10, string_type(10, '\0'));
37 test(string_type(), 100, string_type(100, '\0'));
38 test(string_type(MAKE_CSTRING(CharT, "12345")), 0, string_type());
39 test(string_type(MAKE_CSTRING(CharT, "12345")), 2, string_type(MAKE_CSTRING(CharT, "12")));
40 test(string_type(MAKE_CSTRING(CharT, "12345")), 5, string_type(MAKE_CSTRING(CharT, "12345")));
41 test(string_type(MAKE_CSTRING(CharT, "12345")),
42 15,
43 string_type(MAKE_CSTRING(CharT, "12345\0\0\0\0\0\0\0\0\0\0"), 15));
44 test(string_type(MAKE_CSTRING(CharT, "12345678901234567890123456789012345678901234567890")), 0, string_type());
45 test(string_type(MAKE_CSTRING(CharT, "12345678901234567890123456789012345678901234567890")),
46 10,
47 string_type(MAKE_CSTRING(CharT, "1234567890")));
48 test(string_type(MAKE_CSTRING(CharT, "12345678901234567890123456789012345678901234567890")),
49 50,
50 string_type(MAKE_CSTRING(CharT, "12345678901234567890123456789012345678901234567890")));
51 test(
52 string_type(MAKE_CSTRING(CharT, "12345678901234567890123456789012345678901234567890")),
53 60,
54 string_type(MAKE_CSTRING(CharT, "12345678901234567890123456789012345678901234567890\0\0\0\0\0\0\0\0\0\0"), 60));
55 }
56
57#ifndef TEST_HAS_NO_EXCEPTIONS
58 if (!TEST_IS_CONSTANT_EVALUATED) {
59 std::basic_string<CharT, std::char_traits<CharT>, Alloc> str;
60 try {
61 str.resize(std::string::npos);
62 assert(false);
63 } catch (const std::length_error&) {
64 }
65 }
66#endif
67
68 { // check that string can grow to max_size()
69 std::basic_string<CharT, std::char_traits<CharT>, tiny_size_allocator<32, CharT> > str;
70 str.resize(str.max_size());
71 assert(str.size() == str.max_size());
72 }
73}
74
75TEST_CONSTEXPR_CXX20 bool test() {
76 test_string<char, std::allocator<char> >();
77#if TEST_STD_VER >= 11
78 test_string<char, min_allocator<char>>();
79 test_string<char, safe_allocator<char>>();
80#endif
81
82#ifndef TEST_HAS_NO_WIDE_CHARACTERS
83 test_string<wchar_t, std::allocator<wchar_t> >();
84#endif
85
86 return true;
87}
88
89int main(int, char**) {
90 test();
91#if TEST_STD_VER > 17
92 static_assert(test());
93#endif
94
95 return 0;
96}
97

source code of libcxx/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp