m05-type-driven

Use Rust type safety to prevent invalid states by encoding invariants directly in the type system. This approach leverages type-state patterns and phantom types to enforce valid transitions and capabilities during compilation, eliminating runtime checks.

The type-state pattern enforces compile-time guarantees by using phantom types and marker traits to represent an object's state. This ensures only valid state transitions compile, preventing invalid states from existing without runtime overhead.

Create a newtype wrapper in Rust to enforce domain invariants by wrapping a primitive type in a struct and validating constraints at construction. This pattern encodes constraints without runtime costs, ensuring safe abstractions.

Use phantom types for API design in Rust when you need to enforce workflow constraints and capabilities at compile time. They are ideal for domain modeling and creating safe abstractions that catch errors before execution.

Encoding invariants with types in Rust has no runtime costs. It leverages zero-cost abstractions like newtype wrappers and marker traits to express constraints at compile time, ensuring safe abstractions without performance penalties.