Rust ownership rules, moves, borrowing, mutable references, lifetimes basics and the borrow checker.
45 cards · basic cards · AI-written, checked twice. Edit anything.
- What does it mean to 'own' a value in Rust?
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A variable is responsible for freeing the value when it goes out of scope.- State the first rule of ownership.
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Each value has exactly one owner at a time.- State the second rule of ownership.
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When the owner goes out of scope, the value is dropped.- State the third rule of ownership.
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You can transfer ownership to another variable through assignment.- What happens when you assign a value from one variable to another in Rust?
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Ownership transfers to the new variable, and the original variable becomes invalid.- What is a 'move' in Rust?
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The transfer of ownership from one variable to another.- Can you use a variable after its value has been moved?
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No, the variable is invalid after the move.- Which types are moved instead of copied when assigned?
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Types without the Copy trait, such as String, Vec, and HashMap.- What is the Copy trait?
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A trait that marks types whose values can be safely copied instead of moved.- Do all primitive integer types implement Copy?
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Yes, all primitive integer types (i8, i16, i32, i64, u8, u16, u32, u64, isize, usize) implement Copy.- Do floating-point types implement Copy?
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Yes, both f32 and f64 implement Copy.- Does the bool type implement Copy?
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Yes.- Does String implement Copy?
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No, String does not implement Copy.- Does Vec implement Copy?
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No, Vec does not implement Copy.- What is a reference in Rust?
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A pointer to a value that allows you to use the value without taking ownership.
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