A copy constructor has the same name as the class (let’s call it A) and has a parameter that
a. Is call-by value of an A object
b. Is call-by-reference of another class
c. Is call-by-reference of an A class object
d. Is call-by-name of an object named ~A.
e. None of these
c is the closest. It is preferable to have a const call-by-reference parameter
of class A type..
Explanation: The reference is to break the recursion of A(A object) if a call-by-value were used. What happens is you are passing A object by value, this calls the copy constructor, which has an A object called by value which … and so on. Early C++ compilers would crash, using all of memory if you left out the &. Modern compilers in my experience catch this error.
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