You have to keep a reference to your Wrapper while any numpy array exists. Easiest way to achieve this, is to save this reference in a attribute of the ctype-buffer: class MyWrapper(object): def __init__(self, n=10): # buffer allocated by external library self.size = n self.addr = libc.malloc(C.sizeof(C.c_int) * n) def __del__(self): # buffer freed by … Read more
A dangling pointer is a pointer that points to invalid data or to data which is not valid anymore, for example: Class *object = new Class(); Class *object2 = object; delete object; object = nullptr; // now object2 points to something which is not valid anymore This can occur even in stack allocated objects: Object … Read more
Introduction: The first issue is whether it is legal to use the value of p at all. After a has been destroyed, p acquires what is known as an invalid pointer value. Quote from N4430 (for discussion of N4430’s status see the “Note” below): When the end of the duration of a region of storage … Read more
Both weak and unowned references do not create a strong hold on the referred object (a.k.a. they don’t increase the retain count in order to prevent ARC from deallocating the referred object). But why two keywords? This distinction has to do with the fact that Optional types are built-in the Swift language. Long story short … Read more
How can it be? Isn’t the memory of a local variable inaccessible outside its function? You rent a hotel room. You put a book in the top drawer of the bedside table and go to sleep. You check out the next morning, but “forget” to give back your key. You steal the key! A week … Read more