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_map>
12
13// template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
14// class Alloc = allocator<pair<const Key, T>>>
15// class unordered_map
16
17// template <class... Args>
18// iterator emplace_hint(const_iterator p, Args&&... args);
19
20#include <unordered_map>
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_map<int, Emplaceable> C;
30 typedef C::iterator R;
31 C c;
32 C::const_iterator e = c.end();
33 R r = c.emplace_hint(e, std::piecewise_construct, std::forward_as_tuple(args: 3), std::forward_as_tuple());
34 assert(c.size() == 1);
35 assert(r->first == 3);
36 assert(r->second == Emplaceable());
37
38 r = c.emplace_hint(c.end(), std::pair<const int, Emplaceable>(4, Emplaceable(5, 6)));
39 assert(c.size() == 2);
40 assert(r->first == 4);
41 assert(r->second == Emplaceable(5, 6));
42
43 r = c.emplace_hint(c.end(), std::piecewise_construct, std::forward_as_tuple(args: 5), std::forward_as_tuple(args: 6, args: 7));
44 assert(c.size() == 3);
45 assert(r->first == 5);
46 assert(r->second == Emplaceable(6, 7));
47 }
48 {
49 typedef std::unordered_map<int,
50 Emplaceable,
51 std::hash<int>,
52 std::equal_to<int>,
53 min_allocator<std::pair<const int, Emplaceable>>>
54 C;
55 typedef C::iterator R;
56 C c;
57 C::const_iterator e = c.end();
58 R r = c.emplace_hint(e, std::piecewise_construct, std::forward_as_tuple(args: 3), std::forward_as_tuple());
59 assert(c.size() == 1);
60 assert(r->first == 3);
61 assert(r->second == Emplaceable());
62
63 r = c.emplace_hint(c.end(), std::pair<const int, Emplaceable>(4, Emplaceable(5, 6)));
64 assert(c.size() == 2);
65 assert(r->first == 4);
66 assert(r->second == Emplaceable(5, 6));
67
68 r = c.emplace_hint(c.end(), std::piecewise_construct, std::forward_as_tuple(args: 5), std::forward_as_tuple(args: 6, args: 7));
69 assert(c.size() == 3);
70 assert(r->first == 5);
71 assert(r->second == Emplaceable(6, 7));
72 }
73
74 return 0;
75}
76

source code of libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/emplace_hint.pass.cpp