出现在使用没有定义作为unordered_map的键的pair类型或vector类型的hash键值。 unordered_map<pair<int,int>,int> mp;// pair没有hash值 unordered_map中用std::hash来计算key,但是C++中没有给pair做Hash的函数,所以不能用pair作为unordered_map的key。同理,unordered_set这类也是哈希表的也不能用pair类型或vecto...
第一种: 1#include <iostream>2#include <unordered_set>3#include <utility>4#include <vector>56usingnamespacestd;78usingKEY = pair<int,int>;910//自定义pair的哈希11structPairHash12{13size_toperator()(constKEY& key)const14{15returnhash<int>{}(key.first) ^ hash<int>{}(key.second);16}17...
boost::unordered_map<int, int>(N) assign cost: 55.783 ms google::dense_hash_map<int, int> assign cost: 49.709 ms google::dense_hash_map<int, int, nohashint> assign cost: 38.583 ms google::dense_hash_map<int, int>(N) assign cost: 30.799 ms tsl::hopscotch_map<int, int> assign ...
// hash_multimap_op_ne.cpp// compile with: /EHsc#include<hash_map>#include<iostream>intmain( ){usingnamespacestd;usingnamespacestdext; hash_multimap <int,int> hm1, hm2, hm3;inti;typedefpair <int,int> Int_Pair;for( i =0; i <3; i++ ) { hm1.insert ( Int_Pair ( i, i ) ...
DataType getDate(int i) {//获取散列表第i个元素的值 if(i <=0) std::cout<<"索引值错误,必须为正整数"; return element[i-1]; } bool insertHash(DataType value); private: int maxSize; int count;//当前元素数 DataType* element;//数据域 ...
new key/value pair.openWith["doc"] ="winword.exe";// ContainsKey can be used to test keys before inserting// them.if(!openWith.ContainsKey("ht")) { openWith.Add("ht","hypertrm.exe"); Console.WriteLine("Value added for key = \"ht\": {0}", openWith["ht"]); }// When you...
( 10 ); hms1.insert( 20 ); hms1.insert( 30 ); pair <IntHSet::const_iterator, IntHSet::const_iterator> p1, p2; p1 = hms1.equal_range( 20 ); cout << "The upper bound of the element with " << "a key of 20\nin the hash_multiset hms1 is: " << *(p1.second) << "....
Console.WriteLine(); foreach( string s in keyColl ) { Console.WriteLine("Key = {0}", s); } // Use the Remove method to remove a key/value pair. Console.WriteLine("\nRemove(\"doc\")"); openWith.Remove("doc"); if (!openWith.ContainsKey("doc")) { Console.WriteLine("...
Console.WriteLine(); foreach( string s in keyColl ) { Console.WriteLine("Key = {0}", s); } // Use the Remove method to remove a key/value pair. Console.WriteLine("\nRemove(\"doc\")"); openWith.Remove("doc"); if (!openWith.ContainsKey("doc")) { Console.WriteLine("Key \"...
// 哈希表每个空间给个标记// EMPTY此位置空, EXIST此位置已经有元素, DELETE元素已经删除enumState{EMPTY,EXIST,DELETE};// 注意:假如实现的哈希表中元素唯一,即key相同的元素不再进行插入// 为了实现简单,此哈希表中我们将比较直接与元素绑定在一起template<classK,classV>classHashTable{struct Elem{pair<K,...