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
21#include <unordered_map>
22#include <cassert>
23
24#include "test_macros.h"
25#include "../../../Emplaceable.h"
26#include "min_allocator.h"
27
28int main(int, char**)
29{
30 {
31 typedef std::unordered_map<int, Emplaceable> C;
32 typedef C::iterator R;
33 C c;
34 C::const_iterator e = c.end();
35 R r = c.emplace_hint(e, std::piecewise_construct, std::forward_as_tuple(args: 3),
36 std::forward_as_tuple());
37 assert(c.size() == 1);
38 assert(r->first == 3);
39 assert(r->second == Emplaceable());
40
41 r = c.emplace_hint(c.end(), std::pair<const int, Emplaceable>(4, Emplaceable(5, 6)));
42 assert(c.size() == 2);
43 assert(r->first == 4);
44 assert(r->second == Emplaceable(5, 6));
45
46 r = c.emplace_hint(c.end(), std::piecewise_construct, std::forward_as_tuple(args: 5),
47 std::forward_as_tuple(args: 6, args: 7));
48 assert(c.size() == 3);
49 assert(r->first == 5);
50 assert(r->second == Emplaceable(6, 7));
51 }
52 {
53 typedef std::unordered_map<int, Emplaceable, std::hash<int>, std::equal_to<int>,
54 min_allocator<std::pair<const int, Emplaceable>>> 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),
59 std::forward_as_tuple());
60 assert(c.size() == 1);
61 assert(r->first == 3);
62 assert(r->second == Emplaceable());
63
64 r = c.emplace_hint(c.end(), std::pair<const int, Emplaceable>(4, Emplaceable(5, 6)));
65 assert(c.size() == 2);
66 assert(r->first == 4);
67 assert(r->second == Emplaceable(5, 6));
68
69 r = c.emplace_hint(c.end(), std::piecewise_construct, std::forward_as_tuple(args: 5),
70 std::forward_as_tuple(args: 6, args: 7));
71 assert(c.size() == 3);
72 assert(r->first == 5);
73 assert(r->second == Emplaceable(6, 7));
74 }
75
76 return 0;
77}
78

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