Destructor
A destructor is an operation associated with an object or value that performs cleanup when its lifetime ends.
100 C++ Mistakes and How to Avoid Them
A destructor is a C++ special member function that runs when an object is destroyed to release owned resources and perform cleanup.
- How it is used
- Manages owned dynamic and limited resources during normal destruction, exception unwinding, and polymorphic deletion.
- How deep it goes
- Explains cleanup, ownership, virtual dispatch, RAII, and exception paths through worked examples, while deferring complete class redesign.
- Examples
- Uses Page ownership, Shape and Square deletion, Grades arrays, and a database Connection to demonstrate cleanup failures and corrections.
- What you can do after
- Diagnose leaks, double frees, skipped cleanup, and unsafe polymorphic deletion; apply virtual destructors and RAII ownership.
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Idiomatic Rust
A destructor is cleanup behavior automatically invoked when an object is destroyed.
- How it is used
- Ties resource cleanup to object lifetime so an early return need not reach a manual release call.
- How deep it goes
- Explains scope-triggered destruction, ownership moves, and Copy exceptions; shows Drop's signature without a custom implementation.
- Examples
- Contrasts a C early-return leak and C++ smart-pointer cleanup with a Rust String moved into a Vec.
- What you can do after
- Evaluate/understand it to predict cleanup when owned Rust values leave scope and identify why Copy values have no destructor.
Object-Oriented Software Design in C++
A destructor is a C++ member function that runs when an object is destroyed to release resources and perform cleanup.
- How it is used
- Uses destructor instrumentation to expose automatic object-lifetime operations and their performance costs in vectors.
- How deep it goes
- Explains destructor calls through instrumented output but defers detailed destructor implementation and lifetime semantics.
- Examples
- Uses an instrumented Date class and Appointments vector to display destructor calls during copying, appending, printing, insertion, and removal.
- What you can do after
- Diagnose hidden copying, destruction, allocation, and deallocation costs by instrumenting C++ special member functions.
Read how Object-Oriented Software Design in C++ explains destructor →
Related concepts
- freecontrasts with · free is a C standard-library function that releases dynamically allocated storage previously obtained from a compatible allocation function.
- Copy traitcontrasts with · Copy is a Rust marker trait indicating that values of a type can be duplicated implicitly rather than moved.
- exitcontrasts with · exit is a standard-library function that terminates normal program execution after performing required termination processing, without ordinarily unwinding active automatic objects.
- exceptionuses · An exception is a runtime signal or object representing an abnormal condition that interrupts ordinary program flow and may be handled or propagated.
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