Web Reference: Oct 2, 2025 · The default copy constructor performs a shallow copy, shallow copy copies pointer values, not the actual resources they point to. If a class has pointers or runtime resources (like dynamic memory, file handles, network connections), a custom copy constructor is needed. So, the only difference between a copy constructor and a move constructor is whether the source object that is passed to the constructor will have its member fields copied or moved into the new object. In any case: even though Foo (Foo&) is legal, it's not moral because it allows the copy constructor to change the original. If the copy constructor changes the original somehow, you're almost certainly doing something bad.
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