### Matrix @ 0x1df1920 created 5x5 matrix
0.0
4.0
[[ 0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.]
 [ 0.  0.  0.  4.  0.]
 [ 0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.]]
4.0
5.0
[[ 1.  2.  3.]
 [ 4.  5.  6.]]
### Matrix @ 0x1fa8cf0 created 2x3 matrix
1.0 2.0 3.0 
4.0 5.0 6.0 
Instances not destroyed: 2
### Matrix @ 0x1fa8cf0 destroyed 2x3 matrix
Instances not destroyed: 1
### Matrix @ 0x1df1920 destroyed 5x5 matrix
Instances not destroyed: 0
Constructor values: ['5x5 matrix', '2x3 matrix']
Copy constructions: 0
Copy assignments: 0
Move assignments: 0