可自增内存的数组

#include <iostream>
using namespace std;

class poi
{
public:
int x;
int y;
poi()
{


}
poi(int xx,int yy)
{
x=xx;
y=yy;
}
void display()
{
cout<<"x  "<<x<<"  y  "<<y<<endl;
}
~poi()
{

}
};




template <typename T>class   Array 
{ 
public:
unsigned int   sz;/***数组元素个数 ***/
unsigned int  capacity;/***Array占用空间 ***/
T *   array; 
Array() 
{ 
sz   =   0; 
capacity   = 2; 
point=new T[capacity]; 
} 

~Array() 

{ 

/***这里为释放[]型***/

delete  []  array; //而不是delete   point; 
} 

void   push(T  obj) 
{ 
if(sz==capacity)   /***空间已满 ***/
{ 
T *old   ; 
old=array; 

array = new T[capacity * 2]; 

memcpy(array, old, capacity * sizeof(T)); 

/****下句注释掉**/

//delete   old; 

capacity = capacity*2; 
} 
array[sz] = obj; 
sz++;   

} 

/****[]的两个重载版本**/

T & operator [](unsigned int index)
{
return point[index];
}

const T & operator [](unsigned int index) const
{
return point[index];
}

unsigned int size()
{
return sz;
}
};




int main()
{


Array<poi> arr;
for (int i=0;i<100;i++)
{
poi po(i,i*2);
arr.push(po);
}
for (int i=0;i<arr.size();i++)
{
arr[i].display();//或者arr.array[i].display();
}

return 0;
}