37 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 key_eq() 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 24 map_type m;25 std::pair<map_type::iterator, bool> p1 = m.insert(map_type::value_type(1, "abc"));26 std::pair<map_type::iterator, bool> p2 = m.insert(map_type::value_type(2, "abc"));27 28 const map_type& cm = m;29 30 assert(cm.key_eq()(p1.first->first, p1.first->first));31 assert(cm.key_eq()(p2.first->first, p2.first->first));32 assert(!cm.key_eq()(p1.first->first, p2.first->first));33 assert(!cm.key_eq()(p2.first->first, p1.first->first));34 35 return 0;36}37