C++ 无序映射未打印所有bucket值
为什么其他“美国”州没有出现 <我是C++新手,请解释任何“NeWBY”的片段,如果不是太难的话。C++ 无序映射未打印所有bucket值,c++,hashmap,iteration,unordered-map,C++,Hashmap,Iteration,Unordered Map,为什么其他“美国”州没有出现
这个例子是直接从CPLUS PLUS()中获取的,但是修改了一点,因为我的C++版本不匹配。
只能包含一个密钥。您需要。
std::无序_映射
只能有唯一的键,因此您的问题所在的数据结构部分存在问题。您可以使用列表
#include <string>
#include <iostream>
#include <unordered_map>
using namespace std;
typedef unordered_map<string, string> wordMap;
int main ()
{
wordMap mymap;
mymap.insert(make_pair("Australia","Canberra"));
mymap.insert(make_pair("U.S.","Washington"));
mymap.insert(make_pair("U.S.","New York"));
mymap.insert(make_pair("U.S.","Kansas"));
mymap.insert(make_pair("France","Paris"));
cout << "mymap contains:";
for ( auto it = mymap.begin(); it != mymap.end(); ++it )
{
cout << " " << it->first << ":" << it->second;
cout << endl;
}
cout << "mymap's buckets contain:\n";
for ( unsigned i = 0; i < mymap.bucket_count(); i++)
{
cout << "bucket #" << i << " contains:" << endl;
for ( auto local_it = mymap.begin(i); local_it != mymap.end(i); local_it++ )
{
cout << " " << local_it->first << ":" << local_it->second;
cout << endl;
}
}
int x;
cin >> x;
return 0;
}
mymap contains: Australia:Canberra U.S.:Washington France:Paris
mymap's buckets contain:
bucket #0 contains:
bucket #1 contains:
bucket #2 contains:
bucket #3 contains:
bucket #4 contains: France:Paris
bucket #5 contains: Australia:Canberra
bucket #6 contains:
bucket #7 contains: U.S.:Washington