C++实现有界数组模板（检查数组是否越界）

#include<iostream>
#include<iomanip>
#include<cassert>
using namespace std;
class Date {
  int imonth, iday, iyear;
  char format[128];
public:
  Date(int m = 0, int d = 0, int y = 0)
  {
    imonth = m;
    iday = d;
    iyear = y;
  }
  friend ostream& operator<<(ostream& os, const Date t) {
    cout << "month" << t.imonth;
    cout << "day" << t.iday;
    cout << "year" << t.iyear;
    return os;
  }
  void display() {
    cout << "month" << imonth;
    cout << "day" << iday;
    cout << "year" << iyear;
    cout << endl;
  }
};
template<class T,int b>
class Array {
  T elem[b];
public:
  Array(){}
  T& operator[](int sub) {
    assert(sub >= 0 && sub < b);
    return elem[sub];
 }
};
void main() {
  Array<Date, 3>dateArray;
  Date dt1(1, 2, 3);
  Date dt2(5, 6, 8);
  Date dt3(9, 6, 8);
  dateArray[0] = dt1;
  dateArray[1] = dt2;
  dateArray[2] = dt3;
  for (int i = 0; i <= 2; i++)
    cout << dateArray[i] << endl;
  Date dt4(10, 11, 13);
  cout << dateArray[3] << endl;//超出了数组界限 弹出错误警告 但不会终止程序
}