Constructors in C++ Part 2 -- Inheritance, Overloading & Tricky Rules

Part 2 of the C++ constructor series. We go beyond the basics and tackle the tricky behavior that interviewers love to ask about — especially around inheritance and the rules of what you can and can't do with constructors: How constructors behave under inheritance — derived must initialize base What happens when the base has only a parameterized constructor (no default) Why virtual constructors are not allowed (but virtual destructors are) = default and = delete — controlling object creation (Singleton, Factory patterns) malloc vs new — why only new calls the constructor explicit keyword — preventing Base b = 10 style implicit conversions Constructor overloading — multiple constructors in one class Calling virtual functions inside a constructor — what actually happens Why constructors should not throw exceptions (destructor won't be called) Key rules: ❌ no static constructor, ❌ no virtual constructor, ✅ constructors are already inline when defined inside the class A must-watch for C++ interview prep and anyone working with class hierarchies. #cpp #cplusplus #inheritance #cppTutorial #cppInterview #oop #virtualFunctions #constructors #programming #coding #learnCpp #techInterview #interviewPrep #codingInterview #cpp11