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 reserve(size_type res_arg); // constexpr since C++20
12
13 // This test relies on https://llvm.org/PR45368 (841132e) being fixed, which isn't in
14 // older Apple dylibs.
15 // XFAIL: using-built-library-before-llvm-12
16
17 #include <string>
18 #include <stdexcept>
19 #include <cassert>
20
21 #include "test_macros.h"
22 #include "min_allocator.h"
23 #include "asan_testing.h"
24
25 template <class S>
26 TEST_CONSTEXPR_CXX20 void
test(typename S::size_type min_cap,typename S::size_type erased_index,typename S::size_type res_arg)27 test(typename S::size_type min_cap, typename S::size_type erased_index, typename S::size_type res_arg) {
28 S s(min_cap, 'a');
29 s.erase(erased_index);
30 assert(s.size() == erased_index);
31 assert(s.capacity() >= min_cap); // Check that we really have at least this capacity.
32 LIBCPP_ASSERT(is_string_asan_correct(s));
33
34 #if TEST_STD_VER > 17
35 typename S::size_type old_cap = s.capacity();
36 #endif
37 S s0 = s;
38 if (res_arg <= s.max_size()) {
39 s.reserve(res_arg);
40 LIBCPP_ASSERT(s.__invariants());
41 assert(s == s0);
42 assert(s.capacity() >= res_arg);
43 assert(s.capacity() >= s.size());
44 LIBCPP_ASSERT(is_string_asan_correct(s));
45 #if TEST_STD_VER > 17
46 assert(s.capacity() >= old_cap); // reserve never shrinks as of P0966 (C++20)
47 #endif
48 }
49 #ifndef TEST_HAS_NO_EXCEPTIONS
50 else if (!TEST_IS_CONSTANT_EVALUATED) {
51 try {
52 s.reserve(res_arg);
53 LIBCPP_ASSERT(s.__invariants());
54 assert(false);
55 } catch (std::length_error&) {
56 assert(res_arg > s.max_size());
57 }
58 }
59 #endif
60 }
61
62 template <class S>
test_string()63 TEST_CONSTEXPR_CXX20 void test_string() {
64 {
65 test<S>(0, 0, 5);
66 test<S>(0, 0, 10);
67 test<S>(0, 0, 50);
68 }
69 {
70 test<S>(100, 1, 5);
71 test<S>(100, 50, 5);
72 test<S>(100, 50, 10);
73 test<S>(100, 50, 50);
74 test<S>(100, 50, 100);
75 test<S>(100, 50, 1000);
76 test<S>(100, 50, S::npos);
77 }
78 }
79
test()80 TEST_CONSTEXPR_CXX20 bool test() {
81 test_string<std::string>();
82 #if TEST_STD_VER >= 11
83 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
84 #endif
85
86 return true;
87 }
88
main(int,char **)89 int main(int, char**) {
90 test();
91 #if TEST_STD_VER > 17
92 static_assert(test());
93 #endif
94
95 return 0;
96 }
97