📖 Book · design patterns · medium
🏗️ The Observer pattern, modern C++
One-to-many change notification with std::function — decoupled, and the dangling-listener traps.
The Observer pattern done the modern way: a subject broadcasting to a list of std::function observers (no base class), push vs pull, and the production traps — lapsed listeners / dangling callbacks, reentrancy during notification, and blocking broadcasts.
3 chapters▶ runnable code✦ in-depth animation
▶ See it animated:GoF Observer — Publish-Subscribe State Notification →
What this book covers
- 01One-to-many, without coupling
- 02Observer with std::function — run it
- 03The traps that bite in production
Read it in full — runnable C++ + step-through animations
Every chapter of The Observer pattern, modern C++ ships complete, editable code you compile and run in the browser, plus the same in-depth animations as the lessons.