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 // hasher hash_function() const;
16
17 #include <unordered_map>
18 #include <string>
19 #include <cassert>
20
main(int,char **)21 int main(int, char**) {
22 typedef std::unordered_map<int, std::string> map_type;
23 map_type m;
24
25 std::pair<map_type::iterator, bool> p = m.insert(map_type::value_type(1, "abc"));
26
27 const map_type& cm = m;
28 assert(cm.hash_function()(p.first->first) == cm.hash_function()(1));
29 assert(cm.hash_function()(1) == cm.hash_function()(p.first->first));
30
31 return 0;
32 }
33