Return not an eigen matrix but a vector, what happens in memory?

[petrasvestartas]

Hi,

I would like to ask how python and pybind11 manages C++ memory.
Before I was strictly using eigen matrices as is written in pybind11.
But I see that if I output a vector of integers, it still works.

For example I output a tuple of < std::vector< RowMatrixXd> and std::vector :
std::tuple< std::vector<RowMatrixXd>, std::vector<int>> pybind11_get_connection_zones();

What happens with the std::vector<int> ?
Do I need to delete it somehow?
These questions comes from the fact that I was using .NET before and each time I had to delete arrays from the memory.