Default Struct Builder

Generates builder methods of every field of a struct. It is meant to be used on structs that implement Default. There is no separate builder struct generated and no need to call a build() method at the end or .unwrap().

This crate is used by the crate leptos-use for the option structs that can be passed to the various functions.

Installation

In your project folder run

sh cargo add default-struct-builder

Usage

It is very easy to use:

```rust use defaultstructbuilder::DefaultBuilder;

[derive(DefaultBuilder, Default)]

pub struct SomeOptions { throttle: f64,

#[builder(into)]
offset: Option<f64>,

#[builder(skip)]
not_included: u32,

} ```

you can then use the struct like this:

```rust let options = SomeOptions::default().offset(4.0);

asserteq!(options.offset, Some(4.0)); asserteq!(options.throttle, 0.0); asserteq!(options.notincluded, 0); ```

How it works

The derive macro generates the following code:

```rust impl SomeOptions { pub fn throttle(self, value: f64) -> Self { Self { throttle: value, ..self } }

pub fn offset<T>(self, value: T) -> Self
where
    T: Into<Option<f64>>,
{
    Self {
        offset: value.into(),
        ..self
    }
}

} ```

Related Work

For more general purposes please check out the much more powerful derive_builder crate.