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Does it make sense to define a copy constructor / operator = in class having pure virtual method or only in derived classes?
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A copy constructor is a member function that initializes an object using another object of the same class. In simple terms, a constructor which creates an object by initializing it with an object of the same class, which has been created previously is known as a copy constructor.
Yes you should. Rules of having your own implementations for copy constructor, copy assignment operator and destructor for a Class will apply to even an Abstract Class.
A copy constructor is a member function of a class that initializes an object with an existing object of the same class. In other words, it creates an exact copy of an already existing object and stores it in a new object.
A copy constructor in a Java class is a constructor that creates an object using another object of the same Java class. That's helpful when we want to copy a complex object that has several fields, or when we want to make a deep copy of an existing object.
like normal classes: yes, if you have a specific implementation need.
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