xref: /llvm-project/libcxx/test/std/containers/unord/unord.multimap/hash_function.pass.cpp (revision be4adb5c2b77b66786617e101e6a845cc587b0a8)
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_multimap
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_multimap<int, std::string> map_type;
23   map_type m;
24 
25   map_type::iterator i1 = m.insert(map_type::value_type(1, "abc"));
26   map_type::iterator i2 = m.insert(map_type::value_type(1, "bcd"));
27 
28   const map_type& cm = m;
29   assert(cm.hash_function()(i1->first) == cm.hash_function()(i2->first));
30   assert(cm.hash_function()(i2->first) == cm.hash_function()(i1->first));
31 
32   return 0;
33 }
34