How Virtual Functions Work in C++ | vptr, vtable, Memory Layout (Interview Guide)(SIMPLE WAY)💯
Автор: ChaloSeekhein
Загружено: 2025-12-03
Просмотров: 17
Описание:
In this video, we explain vptr and vtable, the internal mechanism used by C++ to implement virtual functions and runtime polymorphism.
This is one of the most commonly asked interview topics in C++, system programming, and OOP interviews.
You will learn:
✔ What is a virtual function in C++
✔ How runtime polymorphism actually works
✔ What is vtable (virtual table)
✔ What is vptr (virtual pointer)
✔ How C++ resolves virtual calls at runtime
✔ Complete memory layout of objects with virtual functions
✔ How vtable changes in derived classes
✔ Impact on performance & memory
✔ Multiple inheritance & vptr
✔ Top interview questions based on vptr/vtable
This video is perfect for:
— C++ Beginners
— Placement Preparation
— System-Level Interviews
— C++ Developers
— OOP Concept Revision
— Students preparing for FAANG, Service-Based & MNC Interviews
👉 If you want more deep-dive videos on C++ internals, comment: “Make more C++ internals!”
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