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c++copy-constructor
arjun jawalkar
arjun jawalkar

Reputation: 138

can we pass parameters to a copy constructor in C++

I have a question regarding Copy constructors.

A constructor defined as below, do we call it a copy constructor or just an overloaded constructor ?

A(const A& obj,int x, char y='A')

Upvotes: 2

Views: 1364

Answers (1)

Mike Seymour
Mike Seymour

Reputation: 254771

Copy constructors are defined thusly:

C++11 12.8/2: A non-template constructor for class X is a copy constructor if its first parameter is of type X&, const X&, volatile X& or const volatile X&, and either there are no other parameters or else all other parameters have default arguments

In other words, it must be callable with a single argument - a reference to the object to be copied - but can have extra, optional, parameters.

Your example doesn't meet this requirement since it has two mandatory parameters. If the second parameter had a default value:

A(const A& obj, int x=42, char y='A')

then it would be a copy constructor.

Upvotes: 7

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