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// Ensure that all the elements in the vector are destroyed, especially when reallocating the internal buffer
10
11// UNSUPPORTED: c++03
12
13#include <algorithm>
14#include <array>
15#include <cassert>
16#include <cstddef>
17#include <vector>
18
19#include "test_macros.h"
20
21struct DestroyTracker {
22 TEST_CONSTEXPR_CXX20 DestroyTracker(std::vector<bool>& vec) : vec_(&vec), index_(vec.size()) { vec.push_back(false); }
23
24 TEST_CONSTEXPR_CXX20 DestroyTracker(const DestroyTracker& other) : vec_(other.vec_), index_(vec_->size()) {
25 vec_->push_back(false);
26 }
27
28 TEST_CONSTEXPR_CXX20 DestroyTracker& operator=(const DestroyTracker&) { return *this; }
29 TEST_CONSTEXPR_CXX20 ~DestroyTracker() { (*vec_)[index_] = true; }
30
31 std::vector<bool>* vec_;
32 size_t index_;
33};
34
35template <class Operation>
36TEST_CONSTEXPR_CXX20 void test(Operation operation) {
37 std::vector<bool> all_destroyed;
38
39 {
40 std::vector<DestroyTracker> v;
41 for (size_t i = 0; i != 100; ++i)
42 operation(v, all_destroyed);
43 }
44
45 assert(std::all_of(all_destroyed.begin(), all_destroyed.end(), [](bool b) { return b; }));
46}
47
48TEST_CONSTEXPR_CXX20 bool test() {
49 test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.emplace_back(args&: tracker); });
50 test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.push_back(tracker); });
51 test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.emplace(position: vec.begin(), args&: tracker); });
52 test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.insert(vec.begin(), tracker); });
53 test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.resize(vec.size() + 1, tracker); });
54#if TEST_STD_VER >= 23
55 test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) {
56 vec.insert_range(vec.begin(), std::array<DestroyTracker, 2>{tracker, tracker});
57 });
58
59 test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) {
60 vec.append_range(std::array<DestroyTracker, 2>{tracker, tracker});
61 });
62#endif
63
64 return true;
65}
66
67int main(int, char**) {
68 test();
69#if TEST_STD_VER >= 20
70 static_assert(test());
71#endif
72
73 return 0;
74}
75

source code of libcxx/test/std/containers/sequences/vector/vector.modifiers/destroy_elements.pass.cpp