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
10
11// <unordered_set>
12
13// template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
14// class Alloc = allocator<Value>>
15// class unordered_set
16
17// template <class... Args>
18// pair<iterator, bool> emplace(Args&&... args);
19
20#include <unordered_set>
21#include <cassert>
22
23#include "test_macros.h"
24#include "../../Emplaceable.h"
25#include "min_allocator.h"
26
27int main(int, char**) {
28 {
29 typedef std::unordered_set<Emplaceable> C;
30 typedef std::pair<C::iterator, bool> R;
31 C c;
32 R r = c.emplace();
33 assert(c.size() == 1);
34 assert(*r.first == Emplaceable());
35 assert(r.second);
36
37 r = c.emplace(Emplaceable(5, 6));
38 assert(c.size() == 2);
39 assert(*r.first == Emplaceable(5, 6));
40 assert(r.second);
41
42 r = c.emplace(5, 6);
43 assert(c.size() == 2);
44 assert(*r.first == Emplaceable(5, 6));
45 assert(!r.second);
46 }
47 {
48 typedef std::
49 unordered_set<Emplaceable, std::hash<Emplaceable>, std::equal_to<Emplaceable>, min_allocator<Emplaceable>>
50 C;
51 typedef std::pair<C::iterator, bool> R;
52 C c;
53 R r = c.emplace();
54 assert(c.size() == 1);
55 assert(*r.first == Emplaceable());
56 assert(r.second);
57
58 r = c.emplace(Emplaceable(5, 6));
59 assert(c.size() == 2);
60 assert(*r.first == Emplaceable(5, 6));
61 assert(r.second);
62
63 r = c.emplace(5, 6);
64 assert(c.size() == 2);
65 assert(*r.first == Emplaceable(5, 6));
66 assert(!r.second);
67 }
68
69 return 0;
70}
71

source code of libcxx/test/std/containers/unord/unord.set/emplace.pass.cpp