Rust Unsafe

Definitions

1. A Rust keyword that unlocks five additional capabilities the compiler cannot verify: dereferencing raw pointers, calling unsafe functions (including FFI), accessing mutable statics, implementing unsafe traits, and accessing union fields. Unsafe blocks are a deliberate escape hatch — the programmer assumes responsibility for upholding Rust's safety invariants within that scope.

   In plain English: A special mode in Rust that turns off some safety checks when you need to do low-level things the compiler can't verify, putting the responsibility on the programmer.

   Example: "We need an unsafe block to call the C library through FFI, but we wrap it in a safe API so callers never touch raw pointers."

Related Terms

• Borrowing
• Lifetime
• Ownership
• Unsafe
• Monomorphization
• Native Bridge
• Newtype
• Platform Invoke
• Rust Borrow Checker
• Rust Lifetime
• Stack Unwinding
• Waker