check the shape of vector/matrix in operation

[gf712]

Right now I can add two dynamic vectors/matrices of different shapes, which could lead to some unexpected results...

STD_LA::dyn_vector<double> vec1{1,2};
STD_LA::dyn_vector<double> vec2{1,2,3};
auto result = vec1 + vec2; // {2,4}
std::cout << result.size() << "\n"; // 2

I would personally expect an error (at most some broadcasting, e.g. result would have 3 elements, because under the hood vec1 would be interpreted as {1,2,0})

[rishabh-jain14]

@gf712 Can i work on this issue?