New on YouTube: How Jane Street made $5B in India (and what SEBI says it did) - Watch now

⚡ Build the skills to land top-paying quant jobs. Offer ends in 23d 14h 02m 18s23 days 14 hours 2 minutes 18 seconds.

Get quant-ready in 2026

⚡ Build the skills to land top-paying quant jobs. Offer ends in 23d 14h 02m 18s23 days 14 hours 2 minutes 18 seconds.

Classes and Resource Ownership · 4:18

Concrete Types and RAII

We build a small Vector class whose 16-byte handle lives on the stack while its numbers live on the heap. The constructor acquires the memory, the destructor gives it back, and C++ guarantees the destructor runs at every closing brace, so cleanup is automatic: that pattern is RAII. We also see why naked new leaks, why single-argument constructors should be explicit, and how the same idea manages locks and files.

You will learn

Explain why a concrete type's representation lets it live on the stack
Write a class whose constructor acquires a resource and whose destructor releases it
Predict when destructors run, including the reverse order at the end of a scope
Use explicit to stop accidental conversions, and apply RAII to locks and files

Chapters

PreviousStructs, Enums, and Memory Layout NextCopying: Shallow vs Deep