Question 1

In Rust, where are local variables of primitive types like i32 or bool stored?

Accepted Answer

Local variables of primitive types are stored on the stack. The stack provides very fast allocation and deallocation because it operates on the LIFO (Last In, First Out) principle. Primitive types have a size known at compile time, which allows the compiler to reserve the necessary space on the current function's stack frame.

Question 2

Which smart pointer should be used to allocate a value on the heap with a single owner?

Accepted Answer

Box<T> is the simplest smart pointer for heap allocation. It guarantees single ownership and automatically frees memory when the Box goes out of scope. Box is useful for types with unknown compile-time size, for large structures that shouldn't be copied on the stack, or for recursive types.

Question 3

What is the RAII (Resource Acquisition Is Initialization) pattern in Rust?

Accepted Answer

RAII is a pattern where resources (memory, files, connections) are acquired during object creation and automatically released upon destruction. In Rust, this is done via the Drop trait which is automatically called when a value goes out of scope. This pattern ensures no resource is forgotten and prevents memory leaks.

Memory Management

In Rust, where are local variables of primitive types like i32 or bool stored?

Câu trả lời

Which smart pointer should be used to allocate a value on the heap with a single owner?

Câu trả lời

What is the RAII (Resource Acquisition Is Initialization) pattern in Rust?

Câu trả lời

When is the Drop trait automatically called in Rust?

How can a memory leak be created with Rc<T> in Rust?

Các chủ đề phỏng vấn Rust khác

Rust Basics

Ownership & Borrowing

Structs & Enums

Error Handling

Collections

Modules & Packages

Traits

Generics

Lifetimes

Iterators & Closures

Smart Pointers

Concurrency Basics

async/await

Testing

Cargo & Ecosystem

Pattern Matching

Macros

Serde & Serialization

Unsafe Rust

Advanced Traits

Advanced Lifetimes

Type System

Tokio & Async I/O

Performance Optimization

Web Frameworks

Database Integration

Rust Design Patterns

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