Trait Builder 

pub trait Builder: Any {
    type From;
    type To;

    // Required methods
    fn new(value: Self::From) -> Self;
    fn build(self) -> Self::To;
}

Builder trait

Builder trait is a trait to builder pattern

Although there are few methods that need to be implemented uniformly in this trait, it exists as a specification

Required Associated Types

type From

type To

Required Methods

fn new(value: Self::From) -> Self

From target to builder

consume the target and return the builder

Attention

• default use Self::default() to create a new builder if the builder has no parent
• if the builder has a parent, you need to implement the method to create a new builder

fn build(self) -> Self::To

Build the target

consume the builder and return the target

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors