Rust Intermediate Quiz 4
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Quiz 4
1. What does it mean if a struct has a lifetime parameter, like 'Struct<'a>'?
The struct will be deleted after 'a' seconds
The struct holds a reference with lifetime 'a'
The struct is a constant
2. What is the 'Cow' smart pointer?
Copy-on-Write enum
Concurrent Object Wrapper
Collection of Words
3. When does macro expansion happen?
At runtime
During linking
During the early stages of compilation
4. How do you access the fields of a tuple struct?
By field name
By index (e.g., .0, .1)
Using a getter method only
5. What is the performance trade-off of using trait objects (dyn Trait)?
Slower execution due to runtime lookup
Higher memory usage on the stack
Slower compilation time
6. What is a common use for 'associated functions' (those without self)?
To delete the struct
To modify private fields
To act as constructors for the type
7. What is a 'deadlock'?
A program that finishes correctly
Multiple threads waiting for each other, preventing progress
A thread that runs too fast
8. What is the relationship between 'From' and 'Into' traits?
Implementing From automatically implements Into
They are completely unrelated
Into is only for the heap
9. What does the 'Unpin' trait mean in Async Rust?
The type cannot be used in async functions
The type is pinned to a specific thread
The type is safe to move in memory
10. What are 'Attributes' (e.g., #[test]) used for?
To store user data
To provide metadata to the compiler
To define variables
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