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// class forward_list
12
13// bool empty() const noexcept; // constexpr since C++26
14
15#include <forward_list>
16#include <cassert>
17
18#include "test_macros.h"
19#include "min_allocator.h"
20
21TEST_CONSTEXPR_CXX26 bool test() {
22 {
23 typedef std::forward_list<int> C;
24 C c;
25 ASSERT_NOEXCEPT(c.empty());
26 assert(c.empty());
27 c.push_front(val: C::value_type(1));
28 assert(!c.empty());
29 c.clear();
30 assert(c.empty());
31 }
32#if TEST_STD_VER >= 11
33 {
34 typedef std::forward_list<int, min_allocator<int>> C;
35 C c;
36 ASSERT_NOEXCEPT(c.empty());
37 assert(c.empty());
38 c.push_front(C::value_type(1));
39 assert(!c.empty());
40 c.clear();
41 assert(c.empty());
42 }
43#endif
44
45 return true;
46}
47
48int main(int, char**) {
49 assert(test());
50#if TEST_STD_VER >= 26
51 static_assert(test());
52#endif
53
54 return 0;
55}
56

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