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// <unordered_map>
10
11// template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
12// class Alloc = allocator<pair<const Key, T>>>
13// class unordered_map
14
15// https://llvm.org/PR16538
16// https://llvm.org/PR16549
17
18#include <unordered_map>
19#include <cassert>
20
21#include "test_macros.h"
22
23struct Key {
24 template <typename T>
25 Key(const T&) {}
26 bool operator==(const Key&) const { return true; }
27};
28
29template <>
30struct std::hash<Key> {
31 std::size_t operator()(Key const&) const { return 0; }
32};
33
34int main(int, char**) {
35 typedef std::unordered_map<Key, int> MapT;
36 typedef MapT::iterator Iter;
37 MapT map;
38 Iter it = map.find(Key(0));
39 assert(it == map.end());
40 std::pair<Iter, bool> result = map.insert(std::make_pair(Key(0), 42));
41 assert(result.second);
42 assert(result.first->second == 42);
43
44 return 0;
45}
46

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