Trait ValueObject 

pub trait ValueObject:
    Clone
    + Eq
    + Hash
    + Debug
    + Send
    + Sync {
    type Error: Error + Send + Sync;

    // Required method
    fn validate(&self) -> Result<(), Self::Error>;

    // Provided methods
    fn new_validated(self) -> Result<Self, Self::Error>
       where Self: Sized { ... }
    fn is_valid(&self) -> bool { ... }
}

DDD Value Object trait.

Value Objects are characterized by:

• Immutability (once created, they don’t change)
• Equality based on attributes, not identity
• Self-validation

Required Bounds

• Clone: Value objects should be copyable
• Eq + Hash: Equality based on attributes
• Debug: For debugging and logging
• Send + Sync: Thread safety for async contexts

Required Associated Types

type Error: Error + Send + Sync

Error type for validation failures.

Required Methods

fn validate(&self) -> Result<(), Self::Error>

Validate the value object.

Returns Ok(()) if the value object is valid, or an error describing the validation failure.

Provided Methods

fn new_validated(self) -> Result<Self, Self::Error>

where Self: Sized,

Create a validated instance.

This is a convenience method that validates after construction.

fn is_valid(&self) -> bool

Check if this value object is valid without returning an error.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors