33 lines · cpp
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-exception6//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_map14 15// hasher hash_function() const;16 17#include <unordered_map>18#include <string>19#include <cassert>20 21int 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