Why copy constructor must pass by reference

You and OP know why it must be the same to the implicit form by Mr. Stroustrup as well :D. Stop Posting! Good Bye! You are wellcome, Stefan : Now we know: "why? Nice link. Add your solution here. OK Paste as. Treat my content as plain text, not as HTML. Existing Members Sign in to your account. This email is in use. Do you need your password?

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Code block. If its not passed by reference then it would pass by value. If the argument is passed by value, its copy constructor would call itself to copy the actual parameter to formal parameter. This process would go on until the system runs out of memory. So, we should pass it by reference , so that copy constructor does not get invoked.

Asked By: Jony. Answered By: Brian Roach. Answered By: Potatoswatter. Answered By: Romain Hippeau. Answered By: Sriraman. Answered By: Anand Tripathi. Assume that copy elision is not done by compiler. Take a step-up from those "Hello World" programs. Learn to implement data structures like Heap, Stacks, Linked List and many more!

Check out our Data Structures in C course to start learning today. If we add const in copy constructor, the program works fine, i.

So the compiler creates a temporary object which is copied to t2 using copy constructor in the original program The temporary object is passed as an argument to copy constructor. The reason for compiler error is, compiler created temporary objects cannot be bound to non-const references and the original program tries to do that. Passing an object by value required that a functioning copy constructor exist for that object. If I remember, this topic was discussed some time back, around 1 month back.

Can you search it in archive? Compiler take care of dereferencing internally. Guaranteed compile-time safety. The main reason of this is that, if we pass object to the copy constructor it will create a copy of that object and this will again call a copy constructor and this will happen recursively and this will goes in infinite loop.

Because of this copy constructor use references. No Account? Sign up.