The compiler created copy constructor works fine in general. If we don’t define our own copy constructor, the C++ compiler creates a default copy constructor for each class which does a member-wise copy between objects. When is a user-defined copy constructor needed? It is, however, not guaranteed that a copy constructor will be called in all these cases, because the C++ Standard allows the compiler to optimize the copy away in certain cases, one example is the return value optimization (sometimes referred to as RVO). When the compiler generates a temporary object. When an object is constructed based on another object of the same class.Ĥ. When an object of the class is passed (to a function) by value as an argument.ģ. When an object of the class is returned by value.Ģ. In C++, a Copy Constructor may be called in the following cases:ġ. ISRO CS Syllabus for Scientist/Engineer Exam.
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