In C++, what type of constructor is automatically invoked when an object is initialized with another object of the exact same class type?
Option A is correct.. A Copy Constructor (e.g., ClassName(const ClassName &obj)) is invoked when an object is initialized from another object of the same class.
What occurs when an object containing dynamically allocated heap memory relies on the compiler-generated default copy constructor without a custom copy constructor?
Option C is correct.. The default copy constructor performs a shallow copy (member-wise bitwise copy). For pointers, it copies memory addresses rather than buffer contents, leading to shared heap pointers and double-free errors upon destruction.
In C++ constructor initialization lists, in what specific order are class data members initialized?
Option A is correct.. In C++, class data members are always initialized strictly in the order of their declaration inside the class body, regardless of their order in the constructor initialization list.
Which keyword in C++ prevents single-argument constructors from being used for implicit type conversions?
Option B is correct.. The 'explicit' keyword prevents the compiler from using a single-argument constructor to perform implicit type conversions during assignment or function calls.
Why must the parameter of a Copy Constructor in C++ be passed by reference (const ClassName &obj) rather than by value?
Option A is correct.. If the parameter were passed by value, passing the argument into the copy constructor would itself require calling the copy constructor, leading to an infinite recursive loop.