Question 1

What is the primary use case for Box<T> in Rust?

Accepted Answer

Box<T> allocates data on the heap instead of the stack. This is useful for types with unknown size at compile time (recursive types), transferring ownership of large data without copying, or creating trait objects. The Box pointer itself has a fixed size on the stack.

Question 2

How to define a recursive type like a linked list in Rust?

Accepted Answer

A direct recursive type like enum List { Cons(i32, List), Nil } does not compile because the compiler cannot determine the size. Using Box<List> creates an indirection with a fixed size (pointer), allowing the compiler to calculate the type's size.

Question 3

What is the main difference between Rc and Arc?

Accepted Answer

Rc (Reference Counted) uses a non-atomic reference counter, making it more performant but limited to a single thread. Arc (Atomically Reference Counted) uses atomic operations for the counter, enabling sharing across threads but with a slight performance overhead.

Smart Pointers

What is the primary use case for Box<T> in Rust?

Câu trả lời

How to define a recursive type like a linked list in Rust?

Câu trả lời

What is the main difference between Rc<T> and Arc<T>?

Câu trả lời

What does the Deref trait enable in Rust?

What is interior mutability 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

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

Memory Management

Web Frameworks

Database Integration

Rust Design Patterns

Nắm vững Rust cho lần phỏng vấn tiếp theo