Buildit

Library that helps you create builders for your structures with compile-time guarantees.

use buildit::Builder;

#[derive(Default)]
enum Protocol {
    #[default]
    Http,
    Grpc,
}

#[derive(Builder)]
struct Config {
    port: u16,
    host: &'static str,
    #[builder(default)]
    protocol: Protocol,
}

You may use it as ordinary builder:

let config = Config::builder()
    .port(8080)
    .host("example.rs")
    .build();

Or by create ConfigBuilder explicit:

let config = ConfigBuilder::new()
    .host("example.rs")
    .port("443")
    .build();

Features

• Generic and lifetime field support
• Default trait support of custom default value for fields
• Clean and understandable errors
• Multiple time setter calls is allowed
• Simplification of working with partially initialized builders

Limitations

• Compilation time for huge structures. It may be fixed in one day when specialization will be ready.

Why not {crate}?

• typed-builder - I create buildit to fix the complication of using partially initialized builders in the first place and try to extend a type-state pattern-based builder by traits. But if you have an issue with compile time, a typed-builder is a good choice for you.
• derive-builder - If you don't need compile-time guarantees is a good choice too, probably best.