m05-type-driven

Type-driven design prevents invalid states by using newtypes, phantom types, and the type-state pattern to represent distinct states as distinct types, restricting transitions to valid paths and enforcing invariants through constructors.

The type-state pattern models resource lifecycles and guarded transitions as distinct types, exposing only safe state changes via constructors and APIs to provide compile-time validation and zero-cost abstraction guarantees.

Implement a Rust resource handle using type-states and phantom types to model lifecycles, enforcing compile-time validation by restricting state transitions and exposing safe constructors that validate invariants before instantiation.

Use phantom types and newtypes for Rust API safety when modeling guarded state transitions like connection lifecycles or builder-based initialization, ensuring compile-time validation by encoding invariants directly into the type system.

Yes, the type-state pattern applies to builder-based initialization by encoding invariants in types, enforcing compile-time validation of builder steps, and restricting transitions through safe constructors to guarantee valid object construction.

Type-driven design in Rust can increase code complexity when modeling intricate state machines, requiring careful constructor design and phantom type management to ensure compile-time validation does not overly restrict API flexibility.