Windows下C++删除清除map

清除单map（非嵌套map）

#include<map>
#include<string>
#include<iostream>
using namespace std;

int main()
{
    map<int, string> m_in;
    map<int,string>::iterator it_m_in;
    m_in[1]= "1111111111111111";
    m_in[2]= "2222222222222222";
    m_in[3]= "3333333333333333";
    m_in[4]= "4444444444444444";
    m_in[0]= "5555555555555555";

    for(it_m_in = m_in.begin(); it_m_in!=m_in.end();)
    {
        cout<<"    "<<it_m_in->first<<" --> "<<it_m_in->second<<"\n";
        m_in.erase(it_m_in++);
    }
    cout<<endl;
    return   0;
}

清除嵌套map

#include<map>
#include<string>
#include<iostream>
using namespace std;

int main()
{
    map<int, string> m_in;
    map<int,string>::iterator it_m_in;
    map<int, map<int, string>> m;
    map<int, map<int, string>>::iterator it_m;
    m_in[1]= "1111111111111111";
    m_in[2]= "2222222222222222";
    m_in[3]= "3333333333333333";
    m_in[4]= "4444444444444444";
    m_in[0]= "5555555555555555";
    m[11] = m_in;

    for(it_m=m.begin();it_m!=m.end();)
    {
        cout<<"key: "<<it_m->first <<"\n  value: \n";
        for(it_m_in = m_in.begin(); it_m_in!=m_in.end();)
        {
            cout<<"    "<<it_m_in->first<<" --> "<<it_m_in->second<<"\n";
            m_in.erase(it_m_in++);
        }
        cout<<endl;
        m.erase(it_m++);
    }
    return   0;
}

总结

嵌套map要一步一步删除。