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// flat_set();
14
15#include <cassert>
16#include <deque>
17#include <flat_set>
18#include <functional>
19#include <type_traits>
20#include <vector>
21
22#include "min_allocator.h"
23#include "MoveOnly.h"
24#include "test_allocator.h"
25#include "test_macros.h"
26
27struct DefaultCtableComp {
28 explicit DefaultCtableComp() { default_constructed_ = true; }
29 bool operator()(int, int) const { return false; }
30 bool default_constructed_ = false;
31};
32
33struct ThrowingCtorComp {
34 ThrowingCtorComp() noexcept(false) {}
35 bool operator()(const auto&, const auto&) const { return false; }
36};
37
38void test() {
39 {
40 std::flat_set<int> m;
41 assert(m.empty());
42 }
43 {
44 // explicit(false)
45 std::flat_set<int> m = {};
46 assert(m.empty());
47 }
48 {
49 std::flat_set<int, DefaultCtableComp, std::deque<int, min_allocator<int>>> m;
50 assert(m.empty());
51 assert(m.begin() == m.end());
52 assert(m.key_comp().default_constructed_);
53 }
54 {
55 using A1 = explicit_allocator<int>;
56 {
57 std::flat_set<int, DefaultCtableComp, std::vector<int, A1>> m;
58 assert(m.empty());
59 assert(m.key_comp().default_constructed_);
60 }
61 {
62 A1 a1;
63 std::flat_set<int, DefaultCtableComp, std::vector<int, A1>> m(a1);
64 assert(m.empty());
65 assert(m.key_comp().default_constructed_);
66 }
67 }
68#if defined(_LIBCPP_VERSION)
69 {
70 using C = std::flat_set<MoveOnly>;
71 static_assert(std::is_nothrow_default_constructible_v<C>);
72 C c;
73 }
74 {
75 using C = std::flat_set<MoveOnly, std::less<MoveOnly>, std::vector<MoveOnly, test_allocator<MoveOnly>>>;
76 static_assert(std::is_nothrow_default_constructible_v<C>);
77 C c;
78 }
79#endif // _LIBCPP_VERSION
80 {
81 using C = std::flat_set<MoveOnly, std::less<MoveOnly>, std::vector<MoveOnly, other_allocator<MoveOnly>>>;
82 static_assert(!std::is_nothrow_default_constructible_v<C>);
83 C c;
84 }
85 {
86 using C = std::flat_set<MoveOnly, ThrowingCtorComp>;
87 static_assert(!std::is_nothrow_default_constructible_v<C>);
88 C c;
89 }
90}
91
92int main(int, char**) {
93 test();
94
95 return 0;
96}
97

source code of libcxx/test/std/containers/container.adaptors/flat.set/flat.set.cons/default.pass.cpp