Basic question about allocation

[feraudyh]

Suppose I have a function in the code of which I have

QVector<int> myvector;

QVector<int> myvector;

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further down I append elements to myvector
like this

myvector.append(3)

myvector.append(3)

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Where does the allocation take place? On the stack? On the heap?
What do I need to know about freeing the memory?