map容器的四种插入元素方法

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//插入元素 //四种插入方法比较void display(){map<int,string> m;pair<map<int,string>::iterator,bool> pair1 ,pair2,pair3;//1.方法 pair1 = m.insert(pair<int,string>(1,"teacher01"));pair2 = m.insert(pair<int,string>(2,"teacher02"));pair3 = m.insert(pair<int,string>(2,"teacher02"));if (pair2.second){cout<<"2 teacher02插入成功"<<endl;cout<<pair2.first->first<<":"<<pair2.second<<endl;}else{cout<<"2 teacher02插入失败"<<endl;cout<<pair2.first->first<<":"<<pair2.second<<endl;}if (pair3.second){cout<<"2 teacher02插入成功"<<endl;cout<<pair3.first->first<<":"<<pair3.second<<endl;}else{cout<<"2 teacher02插入失败"<<endl;cout<<pair3.first->first<<":"<<pair3.second<<endl;}//2.方法 m.insert(make_pair(3,"teacher03"));m.insert(make_pair(4,"teacher04"));//3.方法 m.insert(map<int,string>::value_type(5,"teacher05"));m.insert(map<int,string>::value_type(6,"teacher06"));//4. 如果key相等 会修改对应的value m[7] = "teacher07";m[8] = "teacher08";m[0] = "teacher09";m[0] = "teacher00";//遍历for (map<int,string>::iterator it = m.begin();it!=m.end();it++){cout<<(*it).first<<endl;cout<<(*it).second<<endl;}while (!m.empty()){map<int,string>::iterator it = m.begin();cout<<it->first<<"\t"<<it->second<<endl;m.erase(it);}}

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