Practice C++ interview questions covering memory management, RAII, smart pointers, move semantics, STL containers, templates, concurrency, and object-oriented design.
C++ interviews are demanding because the language sits at the intersection of high performance and low-level control — interviewers expect you to know both what the code does and what the hardware is doing underneath. Roles in game engines, real-time systems, trading infrastructure, and embedded software all rely on strong C++ fundamentals.
The most consistently tested area is memory management: stack vs heap allocation, RAII, ownership semantics, smart pointers (unique_ptr, shared_ptr, weak_ptr), and the real cost of copying vs moving. Understand move semantics deeply — when the move constructor is called vs the copy constructor, how std::move works, and the rules around return value optimisation (RVO and NRVO). Template metaprogramming and the STL form another large chunk: know when to use std::vector vs std::deque vs std::list, how std::unordered_map achieves O(1) average lookup, and how std::sort compares to a hand-written sort.
Object model questions — vtable layout, virtual dispatch overhead, diamond inheritance, and the cost of virtual destructors — appear frequently at systems-level roles. Concurrency is increasingly tested: std::thread, std::mutex, std::atomic, and the C++20 memory model (happens-before, acquire/release). Use the Top 50 C++ Interview Questions to practise articulating these concepts without getting lost in undefined-behaviour edge cases.
