Rust Advanced Quiz 1
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Quiz 1
1. What are 'Higher-Rank Trait Bounds' (HRTBs) used for?
Speeding up trait lookups
Expressing bounds that are valid for all possible lifetimes
Implementing traits for external crates
2. What does 'Variance' refer to in Rust's type system?
The speed difference between loops
How much memory a struct uses
How subtyping of lifetimes behaves in generic types
3. What is the primary purpose of 'Pin<P>'?
To guarantee a value won't be moved in memory
To force a variable to stay on the stack
To prevent a variable from being dropped
4. What is 'PhantomData<T>' used for?
To store encrypted data
To mark a struct as logically owning a type for variance/drop purposes
To create a pointer that cannot be dereferenced
5. What is a major restriction of 'std::mem::transmute'?
It only works on integers
It cannot be used in unsafe blocks
The source and destination types must have the same size
6. What improvement did 'Non-Lexical Lifetimes' (NLL) bring?
Borrowing ends at the last use rather than the end of the curly brace
It made lifetimes optional in all cases
It allowed references to be stored in global variables
7. How do you switch the default memory allocator in a Rust binary?
Changing a setting in Cargo.toml
Using the #[global_allocator] attribute
Rust does not allow changing the allocator
8. What is 'SIMD' in the context of Rust performance?
Simple Instruction Memory Design
Secure Internal Managed Data
Single Instruction, Multiple Data
9. What does a 'fat pointer' in Rust contain?
Four memory addresses
A pointer to data and a pointer to metadata/vtable
A pointer that never expires
10. What is a 'Re-entrant' Mutex?
A mutex that can be locked multiple times by the same thread
A mutex that automatically unlocks after a timeout
A mutex used for network sockets
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