c++ - A bug in code about write a class that is same array of pointer? -

hello have below code
in pointarray.h

#ifndef pointarray_h_included #define pointarray_h_included  template <typename t> class pointarray { private:     int nsize;     t *array[]; public:     pointarray();     pointarray(const t *points[],const int size);     pointarray(const pointarray &pv);     ~pointarray();     int * get(const int position);//is same array[position]     const int * get(const int position) const;//is same array[position]     const int getsize() const;//get size of array };  #endif // pointarray_h_included 

in pointarray.cpp

#include "pointarray.h" #include<iostream> #include <assert.h> using namespace std;  template<class t> pointarray<t>::pointarray(const t *points[],const int size) {     nsize=size;     (int i=0;i<size;i++)     {         array[i]=new t;         *array[i]=*points[i];     } }  template<class t> pointarray<t>::pointarray() {     nsize=0; }  template<class t> pointarray<t>::pointarray(const pointarray &pv) {     nsize=pv.getsize();     (int i=0;i<nsize;i++)     {         array[i]=new t;         *array[i]=*(pv.get(i));     } }  template<class t> const int pointarray<t>::getsize() const {     return nsize; }  template<class t> pointarray<t>::~pointarray() {     delete[] array;     nsize=0; }  template<class t> int * pointarray<t>::get(const int position) {     assert(position>-1 && position<nsize);     return array[position]; }  template<class t> const int * pointarray<t>::get(const int position) const {     return array[position]; } 

in main.cpp

#include<iostream> #include "pointarray.h" #include "pointarray.cpp" using namespace std;  int main() {     int x=22;     int y=3;     const int * a[2]={&x,&y};     pointarray<int> p;     pointarray<int> p2(a,2);     pointarray<int> p3(p2);     cout << p.getsize() << endl;     cout << p2.getsize() << endl;     cout << p3.getsize() << endl;     return 0; } 

above code should print

0 2 2 

but output

9244616 9244600 2 

and when run again 9244616 , 9244600 changed.
problem?

the problem including cpp file in main , implementing there, template implementations should done in h files. h file should be:

 #ifndef pointarray_h_included #define pointarray_h_included  template <typename t> class pointarray { private:     int nsize;     t *array[]; public:     pointarray()     {         nsize=0;     }     pointarray(const t *points[],const int size)     {         nsize=size;         (int i=0;i<size;i++)         {             array[i]=new t;             *array[i]=*points[i];         }     }     pointarray(const pointarray &pv)     {         nsize=pv.getsize();         (int i=0;i<nsize;i++)         {             array[i]=new t;             *array[i]=*(pv.get(i));         }     }     ~pointarray()     {         delete[] array;         nsize=0;     }     int * get(const int position)     {         assert(position>-1 && position<nsize);         return array[position];     }     const int * get(const int position) const     {         return array[position];     }     const int getsize() const { return nsize;} };  #endif // pointarray_h_included 

code still kind of hard , allocations bad(notice heap assert @ end of process).. worked me: 0 2 2 printed... cheers.

(notice that:)

delete[] array; 

is memory leak, since object not array per try define pointers arrays, should change

t** array 

and @ destructor loop on array first dimension , delete[] array