学习vector打印，发现用template来实现不同类型的vector也可以，如下：

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

template<typename T>
void printVector(const vector<T> &v){
    
    
        for (typename::std::vector<T>::const_iterator it=v.begin();it!=v.end();it++){
    
    
                cout << *it ;
        }
        cout << endl;
}

int main(){
    
    

        vector<int> v1;
        for (int i=0;i<10;i++)
        {
    
    
                v1.push_back(i);
        }

        vector<string> v2={
    
    "aa","bbb","CCCC"};


        for (vector<int>::iterator j=v1.begin(); j != v1.end();j++)
        {
    
    
                cout << *j << "" ;
        }
        cout << endl;

        for (vector<string>::iterator k=v2.begin(); k != v2.end();k++)
        {
    
    
                cout << *k << "" ;
        }
        cout << endl;
        cout << "print vector from template" <<endl;
        printVector(v1);
        printVector(v2);

        return 0;
}  

写的过程遇到：need ‘typename’ before ‘std::vector::iterator’ because ‘std::vector’ is a dependent scope
查看解决，感谢：https://blog.csdn.net/u013620306/article/details/128450381