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// <forward_list>
10
11// void clear() noexcept; // constexpr since C++26
12
13#include <forward_list>
14#include <cassert>
15#include <iterator>
16
17#include "test_macros.h"
18#include "../../../NotConstructible.h"
19#include "min_allocator.h"
20
21TEST_CONSTEXPR_CXX26 bool test() {
22 {
23 typedef NotConstructible T;
24 typedef std::forward_list<T> C;
25 C c;
26 ASSERT_NOEXCEPT(c.clear());
27 c.clear();
28 assert(std::distance(c.begin(), c.end()) == 0);
29 }
30 {
31 typedef int T;
32 typedef std::forward_list<T> C;
33 const T t[] = {0, 1, 2, 3, 4};
34 C c(std::begin(t), std::end(t));
35
36 ASSERT_NOEXCEPT(c.clear());
37 c.clear();
38 assert(std::distance(c.begin(), c.end()) == 0);
39
40 c.clear();
41 assert(std::distance(c.begin(), c.end()) == 0);
42 }
43#if TEST_STD_VER >= 11
44 {
45 typedef NotConstructible T;
46 typedef std::forward_list<T, min_allocator<T>> C;
47 C c;
48 ASSERT_NOEXCEPT(c.clear());
49 c.clear();
50 assert(std::distance(c.begin(), c.end()) == 0);
51 }
52 {
53 typedef int T;
54 typedef std::forward_list<T, min_allocator<T>> C;
55 const T t[] = {0, 1, 2, 3, 4};
56 C c(std::begin(t), std::end(t));
57
58 ASSERT_NOEXCEPT(c.clear());
59 c.clear();
60 assert(std::distance(c.begin(), c.end()) == 0);
61
62 c.clear();
63 assert(std::distance(c.begin(), c.end()) == 0);
64 }
65#endif
66
67 return true;
68}
69
70int main(int, char**) {
71 assert(test());
72#if TEST_STD_VER >= 26
73 static_assert(test());
74#endif
75
76 return 0;
77}
78

source code of libcxx/test/std/containers/sequences/forwardlist/forwardlist.modifiers/clear.pass.cpp