Rust Advanced Quiz 3
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Practice Pronunciation (Merriam-Webster)
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Quiz 3
1. In Async Rust, what does the 'Waker' do?
It starts the program
It signals the executor to poll the task again
It pauses a thread
2. How do associated types affect trait selection?
They ensure a type can only implement the trait once for a specific set of inputs
They allow a type to implement a trait many times
They have no effect on selection
3. Why is 'Pin' necessary for self-referential structs?
To make them faster
To allow them to be sent over threads
To prevent pointers to internal fields from becoming invalid due to moves
4. What is 'Ordering::Relaxed' used for?
Stopping all other threads
Operations where only atomicity is needed, not synchronization with other variables
Deleting data safely
5. What is an 'OIBIT'?
Opt-in Built-in Trait
Organized Internal Binary Tree
Optimized Instruction Binary Tool
6. What is the purpose of an 'extern' block?
To make a module public
To define a global variable
To declare signatures for functions in a foreign library (FFI)
7. What is a 'Panic Hook'?
A way to prevent a panic
A function called when a panic occurs
A tool to debug a crashed program
8. What is a 'vtable'?
A table of function pointers for dynamic dispatch
A list of all variables on the stack
A compiler feature for sorting arrays
9. Which of these makes a trait NOT 'object safe'?
Having more than 5 methods
Having a method with generic type parameters
Using 'self' as a reference
10. Why are mutable references (&mut T) 'Invariant' over T?
To make them faster
Because they are unique
To prevent writing a supertype into a location that expects a subtype
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