c 2b 2b smart pointer 2d array

1#include <iostream>
2#include <memory>
3using namespace std;
4
5int main(){
6	//this just builds a 2D array pi that looks like
7	//0 1 2 3 4
8	//5 6 7 8 9
9	//10 11 12 13
10	//...	   24
11	int** pi=new int*[5];
12	
13	//this counter is augmented by 5 in every loop,
14	//for the value to be 0...,5,..10etc
15	int counter=0;
16	for(int j=0;j<5;j++){	
17		int* i=new int[5];
18		for(int j=0;j<5;j++)
19			i[j]=j+counter;
20		counter=counter+5;
21
22		pi[j]=i;
23		//just to print out the array
24		for(int k=0;k<5;k++)
25			cout<<pi[j][k]<<" ";
26		cout<<endl;
27	}
28	cout<<endl;
29
30	//trying the same thing using smart pointers
31	unique_ptr<int*[]> smp_pi(new int*[5]);
32	counter=0;	
33	for(int j=0;j<5;j++){
34		unique_ptr<int[]> smp_i(new int[5]);		
35		for(int k=0;k<5;k++){
36			smp_i[k]=counter+k;		
37			cout<<smp_i[k]<<" ";
38		}
39		counter=counter+5;
40		cout<<endl;
41		smp_pi[j]=&smp_i[0];
42		//smp_pi[j]=smp_i; //this does not compile. why?
43	}
44	cout<<endl;
45
46	for(int j=0;j<5;j++){	
47		for(int k=0;k<5;k++)
48			cout<<smp_pi[j][k]<<" ";
49		cout<<endl;
50	}
51
52	return 0;
53}