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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
10
11// <flat_set>
12
13// [[nodiscard]] bool empty() const noexcept;
14
15#include <flat_set>
16#include <cassert>
17#include <deque>
18#include <functional>
19#include <utility>
20#include <vector>
21
22#include "MinSequenceContainer.h"
23#include "test_macros.h"
24#include "min_allocator.h"
25
26template <class KeyContainer>
27void test_one() {
28 using Key = typename KeyContainer::value_type;
29 using M = std::flat_multiset<Key, std::less<int>, KeyContainer>;
30 M m;
31 ASSERT_SAME_TYPE(decltype(m.empty()), bool);
32 ASSERT_NOEXCEPT(m.empty());
33 assert(m.empty());
34 assert(std::as_const(m).empty());
35 m = {1};
36 assert(!m.empty());
37 m.clear();
38 assert(m.empty());
39}
40
41void test() {
42 test_one<std::vector<int>>();
43 test_one<std::deque<int>>();
44 test_one<MinSequenceContainer<int>>();
45 test_one<std::vector<int, min_allocator<int>>>();
46}
47
48int main(int, char**) {
49 test();
50
51 return 0;
52}
53

source code of libcxx/test/std/containers/container.adaptors/flat.multiset/flat.multiset.capacity/empty.pass.cpp