为什么第二次删除的时候会报错，求高手指教…(IDE是VC6.0)

Question

#include "vector"
#include "string"
#include "iostream"

using namespace std;

struct STUDENT{
public:
int id;
string name;
STUDENT(int id, string name){
this->id = id;
this->name = name;
}
};

vector<STUDENT> v;

void display();

void main(){

STUDENT s1(1,"zhao");
STUDENT s2(2,"sun");
STUDENT s3(3,"li");

v.push_back(s1);
v.push_back(s2);
v.push_back(s3);

display();

//第一次删除
for(vector<STUDENT>::iterator itr1 = v.begin(); itr1 != v.end(); itr1++){
if(itr1->id == 1){
v.erase(itr1);
}
}

cout<<"==================="<<endl;
display();

//第二次删除
for(vector<STUDENT>::iterator itr2 = v.begin(); itr2 != v.end(); itr2++){
if(itr2->id == 3){
v.erase(itr2);
}
}

cout<<"==================="<<endl;
display();
}
void display(){
for(vector<STUDENT>::iterator itr = v.begin(); itr != v.end(); itr++){
cout<<itr->name<<endl;
}
}

Answer 1

貌似不是因为第二次erase有错，而是，id等于3的时候erase完了就到vector的尾部了，erase操作成功返回值为当前erase对象的next对象指针，需做判断，然后跳出循环。