迭代器问题，请高手解答，谢谢

[zaixiankaifa]

#include<vector>
#include<iostream>
using namespace std;
class Student{
public:
Student(void):m_strName("没想好"){}
Student(const string& strName):m_strName(strName){}
friend ostream& operator<<(ostream& os,const Student& student){
return os<<'<'<<student.m_strName<<'>';
}
private:
string m_strName;
};


template<class T>
void print(T& vn){
cout<<"向量原数个数:"<<vn.size()<<endl;

for(vector<int>::iterator it=vn.begin();it !=vn.end();it++)
cout<<*it<<' ';


/* for(int i=0;i<vn.size();i++)
cout<<vn[i]<<' ';
cout<<endl;
*/


}


int main(){
vector<int> vn;
vn.push_back(34);
vn.push_back(23);
print<vector<int> >(vn);
vector<int>::iterator it=vn.begin();
*it=69;
*(it+1)=56;
print(vn);
*it=89.8;
print(vn);
vn[1000]=99;
print(vn);
cout<<vn[1000]<<endl;
vn.push_back(10);
print(vn);
vn.pop_back();
print(vn);
vector<int>vn2(5,34);
print(vn2);
vector<Student>vn3(10,Student("san"));
vn3[0]=Student("张飞");
vn3[3]=Student("赵云");
vn3[5]=Student("lisi");
vn3.push_back(Student("关羽"));
cout<<vn3[5]<<endl;
cout<<vn3.front()<<endl;
cout<<vn3.back()<<endl;
print(vn3);
return 0;
}


在编译到：print(vn3);时提示错误，提示错误的位置在：for(vector<int>::iterator it=vn.begin();it !=vn.end();it++)，不知道为什么这样子错误提示:No viable conversion from 'iterator'(aka'_normal_iterator<pointer,vector_type>')to'vector<int>::iterator'(.....

请各位高手帮助解答

[pengzhixi]

class Student{
public:
  Student(void):m_strName("没想好"){}
  Student(const string& strName):m_strName(strName){}
  friend ostream& operator<<(ostream& os,const Student& student){
  return os<<'<'<<student.m_strName<<'>';
  }
private:
  string m_strName;
};


template<class T>
void print(T& vn){
  cout<<"向量原数个数:"<<vn.size()<<endl;
    
  for(typename T::iterator it=vn.begin();it !=vn.end();it++)
  cout<<*it<<' ';
    
    
  /* for(int i=0;i<vn.size();i++)
  cout<<vn[i]<<' ';
  cout<<endl;
  */
    
    
}


int main(){
  vector<int> vn;
  vn.push_back(34);
  vn.push_back(23);
  print<vector<int> >(vn);
  vector<int>::iterator it=vn.begin();
  *it=69;
  *(it+1)=56;
  print(vn);
  *it=89;
  print(vn);
  vn[1000]=99;
  print(vn);
  cout<<vn[1000]<<endl;
  vn.push_back(10);
  print(vn);
  vn.pop_back();
  print(vn);
  vector<int>vn2(5,34);
  print(vn2);
  vector<Student>vn3(10,Student("san"));
  vn3[0]=Student("张飞");
  vn3[3]=Student("赵云");
  vn3[5]=Student("lisi");
  vn3.push_back(Student("关羽"));
  cout<<vn3[5]<<endl;
  cout<<vn3.front()<<endl;
  cout<<vn3.back()<<endl;
  print(vn3);

system("pause");
return 0;
}

如果不熟悉模板的使用就去看看书先