13eholder/m12-lifecycle

C++ Resource Lifecycle

Core Question

When does this die?

• Stack: End of scope }.
• Heap: When delete (or smart pointer drop) occurs.
• Static: At program exit (reverse init order).

Error → Design Question

| Issue | Design Question | | ------------------ | ------------------------------------------------------------------- | | Resource Leak | Did you manually open() without a wrapper class? | | Use After Free | Did you capture a reference to a local variable in a lambda/thread? | | Static Fiasco | Do statics depend on each other? (Use Meyers Singleton). |

Thinking Prompt

1. Does it have a destructor?

   • Yes → RAII. Good.
   • No → Wrap it.

2. Does it copy?

   • FILE* cannot copy. Delete copy constructor.

Quick Reference

| Pattern | Use Case | | ---------------- | ------------------------------------------ | | RAII Wrapper | FileHandle, LockGuard. | | Scope Guard | std::scope_exit (Cleanup callback). | | Rule of 5 | Copy/Move/Destructor implementation logic. |