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In VBA, an assignment of variables of type Object is a shallow copy, an assignment for all other types (numeric types, String, user defined types, arrays) is a deep copy. So the keyword Set for an assignment signals a shallow copy and the (optional) keyword Let signals a deep copy. There is no built-in method for deep copies of Objects in VBA.
Because implicitly-generated constructors and assignment operators simply copy all class data members ("shallow copy"), [4] one should define explicit copy constructors and copy assignment operators for classes that encapsulate complex data structures or have external references such as pointers, if you need to copy the objects pointed to by ...
Array's destructor deletes the data array of the original, therefore, when it deleted copy's data, because they share the same pointer, it also deleted first's data. Line (2) now accesses invalid data and writes to it. This produces a segmentation fault. If we write our own copy constructor that performs a deep copy then this problem goes away.
Many OOP programming languages (including Java, D, ECMAScript, and C#) make use of object references.Object references, which are similar to pointers in other languages, allow for objects to be passed around by address so that the whole object need not be copied.
WASHINGTON – President Joe Biden offered his condolences Monday to the victims of a school shooting in Wisconsin and urged Congress to pass tougher gun-control laws. “Today, families in ...
There are a handful of things most of us do every day upon waking up: brush our teeth, scroll on our phones, enjoy a cup of coffee.For many, that cup of coffee is a non-negotiable, whether you ...
Both file descriptors in a dup() system call refer to the same open file description which means they share file offset and file status flags; Similar but not identical to the logic used in pointers, shallow or deep copying or references, changes to the offset on one of the file descriptors changes it for the other file descriptor.
British Airways is overhauling its loyalty program to reward spending instead of miles flown. It will offer more chances to get points while making status harder to achieve for leisure travelers.