Advanced Traits
Associated types vs generics, GATs, trait objects, dyn keyword, object safety, vtables
1What is the main difference between an associated type and a generic parameter in a trait?
What is the main difference between an associated type and a generic parameter in a trait?
Câu trả lời
An associated type allows only one trait implementation per type, while a generic parameter allows multiple implementations. With an associated type, the type is determined by the implementation itself, which simplifies type inference and avoids specifying the type at each use.
2Which keyword is used to create a trait object in Rust?
Which keyword is used to create a trait object in Rust?
Câu trả lời
The dyn keyword is used to create a trait object in Rust. It indicates that method dispatch will happen dynamically at runtime via a vtable, as opposed to static dispatch with generics which is resolved at compile time.
3What is a vtable in the context of trait objects?
What is a vtable in the context of trait objects?
Câu trả lời
A vtable (virtual table) is a table of pointers to the trait method implementations for a concrete type. It is used for dynamic dispatch of trait objects, allowing the correct method to be called at runtime without knowing the concrete type at compile time.
What condition must a trait meet to be object-safe?
Why is the Clone trait not object-safe?
+19 câu hỏi phỏng vấn
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 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
Truy cập tất cả câu hỏi, flashcards, bài kiểm tra kỹ thuật, bài tập code review và mô phỏng phỏng vấn.
Bắt đầu miễn phí