?容器的訪問元素的成員函數（front,back,下標和at）返回的都是引用，如果我們用auto變量去改變保存這些函數的返回值，并且希望通過使用此變量來改變元素的值，那么必須記得將變量定義為引用

#include <iostream> #include <string> #include <vector> #include <deque> #include <list> #include <forward_list> #include <string> #include <array> using namespace std; #define LENGTH 10 typedef int TYPE; typedef vector<TYPE> VECTORTYPE; typedef deque<TYPE> DEQUETYPE; typedef list<TYPE> LISTTYPE; typedef forward_list<TYPE> FORWARD_LISTTYPE; typedef array<TYPE,LENGTH> ARRAYTYPE; void print(VECTORTYPE & ); void print(DEQUETYPE & ); void print(LISTTYPE & ); void print(FORWARD_LISTTYPE & ); void print(ARRAYTYPE & ); void print(string &); void pluralize(size_t ,string &); void print(list<string> &); void print(vector<string> &); int main() {vector<int> v_int{1,2,3,4,5,6,7,8,9};deque<int> d_int{1,2,3,4,5,6,7,8,9,0};for(size_t i = 0; i != v_int.size() ; ++i){int &a = v_int[i];a = 1024;}print(v_int);for(size_t j = 0; j != d_int.size() ; ++j){int &a = d_int.at(j);a = 1025;}print(d_int);return 0; } void print(VECTORTYPE &vec) {for(VECTORTYPE::iterator i = vec.begin() ; i != vec.end() ; ++i){ cout << *i << " ";}cout << endl;return ; }void print(DEQUETYPE &vec) {for(DEQUETYPE::iterator i = vec.begin() ; i != vec.end() ; ++i){ cout << *i << " ";}cout << endl;return ; }void print(LISTTYPE &vec) {for(LISTTYPE::iterator i = vec.begin() ; i != vec.end() ; ++i){ cout << *i << " ";}cout << endl;return ; }void print(FORWARD_LISTTYPE &vec) {for(FORWARD_LISTTYPE::iterator i = vec.begin() ; i != vec.end() ; ++i){ cout << *i << " ";}cout << endl;return ; }void print(ARRAYTYPE &vec) {for(ARRAYTYPE::iterator i = vec.begin() ; i != vec.end() ; ++i){ cout << *i << " ";}cout << endl;return ; }void print(string & s_vec) {for(string::iterator i = s_vec.begin(); i != s_vec.end() ; ++i) {cout << *i << " ";}cout << endl; } void pluralize(size_t cnt,string &word) {if(cnt > 1)word.push_back('s');//equal to word += 's' }void print(vector<string> & s_vec) {for(auto &i :s_vec)cout << i << " ";cout << endl; } void print(list<string> & s_list) {for(auto & i: s_list)cout << i << " ";cout << endl; }

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