When an object's lifetime ends in C++, which special member function of its class is invoked for cleanup?

Introduction / Context:
Object lifetime in C++ begins with construction and ends with destruction. The language provides special member functions to manage both edges. This question asks you to name the function responsible for cleanup.

Given Data / Assumptions:

• An object is leaving scope or being deleted.
• Class may hold resources (memory, files, sockets).
• We want deterministic release of resources.

Concept / Approach:
The destructor (~ClassName) runs automatically at the end of an object's lifetime. It releases resources and restores invariants. This is the RAII pattern: acquire resources in constructors; release them in destructors, ensuring exception safety and deterministic cleanup.

Step-by-Step Solution:
1) Object is created → constructor establishes state.2) Lifetime ends (scope exit, delete) → destructor executes.3) Destructor closes files, frees memory, and performs other necessary cleanup.4) Program continues with no resource leaks tied to the object.

Verification / Alternative check:
Open a file in a class constructor and close it in the destructor. Observe that the file is reliably closed even if exceptions are thrown after construction.

Why Other Options Are Wrong:
Constructor: used at creation, not destruction.Assignment / copy/move constructors: manage copying or moving existing objects, not cleanup at end-of-life.

Common Pitfalls:
Leaving resource release to manual calls; prefer RAII with destructor-based cleanup for robustness.

Final Answer:
destructor