first; } }; typedef typename hash_bucket::HashTable<K, pair<K,T>, MapKeyOfT, Hash>::iterator iterator; typedef typename hash_bucket::HashTable<K, pair<K,T>, MapKeyOfT, Hash>::const_iterator const_iterator; publi
1 std::unordered_map<Key, Value> my_map; 2 3 // 使用insert方法插入元素 4 std::pair<std::unordered_map<Key, Value>::iterator, bool> result = my_map.insert({"key", "value"}); 5 6 if (result.second) { 7 // 插入成功 8 std::cout << "Inserted key: " << result.first->fir...
#include <unordered_map> #include <vector> #include <algorithm> // for std::copy #include <iterator> // for std::inserter int main() { std::vector<std::pair<char, int>> vec = {{'a', 1}, {'b', 2}, {'c', 3}}; std::unordered_map<char, int> m; // 使用 std::copy ...
unordered_map<Key,T>::iterator it; (*it).first; // the key value (of type Key) (*it).second; // the mapped value (of type T) (*it); // the "element value" (of type pair<const Key,T>) 它的键值分别是迭代器的first和second属性。 it->first; // same as (*it).first ...
unordered_map<Key,T>::iterator it; (*it).first;//the key value (of type Key)(*it).second;//the mapped value (of type T)(*it);//the "element value" (of type pair<const Key,T>) 当然,任何其他直接访问操作符,如->或[]都可以使用,例如: ...
#include<unordered_map>//取得键和值:unordered_map<Key,T>::iterator it;it->first;// same as (*it).first (the key value)it->second;// same as (*it).second (the mapped value) 成员函数: =迭代器== begin | 返回指向容器起始位置的迭代器(iterator) end | 返回指向容器末尾位置的迭代器 ...
std::unordered_map<std::string, double> m; /* 返回值类型为 pair<iterator, bool> 其中,迭代器执行新插入的元素,或已存在的元素 bool 表示是否插入成功 */ auto p = m.insert({ "sugar", 0.8 }); if (p.second) { std::cout << "插入成功\n"; } else { std::cout << "已存在,原值为...
#include <iostream>#include <map>int main() {// 创建并初始化一个mapstd::map<std::string, int> m = { {"Alice", 25}, {"Bob", 22}, {"Charlie", 30} };// 插入元素// std::pair<iterator,bool> insert (const value_type& val);m.insert(std::make_pair("David", 32));// 查找...
("first", "Bob")); std::multimap<std::string, std::string>::iterator itor_begin = studentMap2.lower_bound("first"); std::multimap<std::string, std::string>::iterator itor_end = studentMap2.upper_bound("first"); while(itor_begin != itor_end) { cout << itor_begin->first<...
for (map<person, int>::iterator iter = m.begin(); iter != m.end(); iter++) { cout << iter-> << "\t" << iter->first.age << endl; } cout << "---" << endl; for (map<std::string, person>::iterator iter = mp.begin(); iter != mp.end(); iter++) {...