cout << "Key: " << Table.at(x).second.first << endl; cout << "Value: " << Table.at(x).second.second << endl; cout << endl; } }/*main.cpp*/ #include"hashtable.h" #include<iostream> int main() { string hashIndex;
Test the simple hash table class // SimpleHashTable.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include "HashTable.h" #include <iostream> usingnamespacestd; int_tmain(intargc,_TCHAR*argv[]) { HashTableh; h.Insert(234); h.Insert(567); h.Inse...
Status InsertHash(HashTable &H, KeyType key); //对函数的声明 //重构 Status recreateHash(HashTable &H){ RcdType *orcd; int *otag, osize, i; orcd = H.rcd; otag = H.tag; osize = H.size; InitHashTable(H, hashsize[index++]); //把所有元素,按照新哈希函数放到新表中 for (i ...
typedef hashtable<Value, Key, HashFcn, ExtractKey, EqualKey, Alloc> hashtable_type; typedef hashtable_iterator<Value, Key, HashFcn, ExtractKey, EqualKey, Alloc> iterator_type; typedef __hashtable_const_iterator<Value, Key, HashFcn, ExtractKey, EqualKey, Alloc> const_iterator_type; typedef ...
按照hashmap的基本原理用C++实现了简单的基本功能,复杂的实现参考C++库的源码,C++最新的标准库里已经有以下四种基于hashtable的容器: unordered_set(C++11)unordered_multiset(C++11)unordered_map(C++11)unordered_multimap(C++11)。具体参考:http://en.cppreference.com/w/ ...
但是太稀疏,占用太大内存,所以弄一个稠密矩阵,也就是 Embedding Table 如下: `$\left \begin{matrix} 1 & 2 & 3 \ 4 & 5 & 6 \ 7 & 8 & 9 \ 10 & 11 & 12 \ 14 & 15 & 16 \ 17 & 18 & 19 \ 21 & 22 & 23 \ 24 & 25 & 26 \ 27 & 28 & 29 \end{matrix} \right ...
When used in a hash table the instruction cache will usually beat the CPU and throughput measured here. In my tests the smallest FNV1A beats the fastest crc32_hw1 with Perl 5 hash tables. Even if those worse hash functions will lead to more collisions, the overall speed advantage and inli...
uint32_t bucket_num = JoinHashMapHelper::calc_bucket_num<CppType>(data[i], table_items->bucket_size); 2.4.2 DirectMappingHashMap 桶和个数固定 static constexpr size_t BUCKET_SIZE = (int64_t)(RunTimeTypeLimits<PT>::max_value()) - (int64_t)(RunTimeTypeLimits<PT>::min_value())...
Consistent hashing is a special kind of hashing such that when a hash table is resized, only K/n keys need to be remapped on average, where K is the number of keys, and n is the number of slots. In contrast, in most traditional hash tables, a change in the number of array slots...
国内外最优秀的几个 C++ Hashmap 库的基准测试,包括 Boost 的boost::unordered_flat_map,abseil-cpp 库的absl::flat_hash_map,以及 aka::flat_hash_map、tsl::robin_map、ktprime::emhash7、ankerl::unordered_dense::map 等知名的哈希表,jstd::robin_hash_map 在Linux 下的 stl 默认的整型哈希函数下有...