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Improve exemple in canonical form notebook with some debug traces

Merged Improve exemple in canonical form notebook with some debug traces
vrouvrea/gettingstartedwithmoderncpp:improve_canonical_operators_double_free_example into master
Merged ROUVREAU Vincent requested to merge vrouvrea/gettingstartedwithmoderncpp:improve_canonical_operators_double_free_example into master
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3-Operators/4-CanonicalForm.ipynb
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// Dynamic allocation here just to be able to make our point due to the explicit call of destructor with `delete`
// Dynamic allocation here just to be able to make our point due to the explicit call of destructor with `delete`
Vector2* v1 = new Vector2(3., 5., 7.);
Vector2* v1 = new Vector2(3., 5., 7.);
Vector2* v2 = new Vector2(-4., -16., 0.);
Vector2* v2 = new Vector2(-4., -16., 0.);
v2 = v1;
v2 = v1;
std::cout << "Copy done" << std::endl;
std::cout << "Delete v1 @ " << std::hex << v1 << std::endl;
delete v1;
delete v1;
std::cout << "v1 deleted" << std::endl;
// delete v2; // Uncommenting this line leads to a kernel crash...
std::cout << "Delete v2 @ " << std::hex << v2 << std::endl;
 
delete v2; // WARNING: Comment this line for not kernel to crash
}
}