如何使用地图容器?

#include <map>
#include <string>
#include <iostream>

std::ostream& operator<<(std::ostream &os, std::pair<std::string, int> const &s)
{
    os << s.first << " served " << s.second;
    return os;
}

int main()
{
    std::map<std::string, int> servers;
    servers["foo"]++;
    servers["foo"]++;
    servers["foo"]++;
    servers["foo"]++;
    servers["bar"]++;
    servers["bar"]++;

    for (auto s : servers)
        std::cout << s << '\n';
}

for(auto const &waiterStat: servers) std::cout << waiterStat.first << " served " << waiterStat.second << " customers.\n";

你可以用 operator[] 要访问特定键的值, find() 为了搜索一个条目,插入、迭代和其他方法将map表示为键值对的集合。