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use typed_builder::TypedBuilder;
#[derive(Debug, PartialEq, TypedBuilder)]
struct Foo {
/// `x` value.
///
/// This field is mandatory.
x: i32,
// #[builder(default)] without parameter - use the type's default
// #[builder(setter(strip_option))] - wrap the setter argument with `Some(...)`
#[builder(
default,
setter(strip_option, doc = "Set `y`. If you don't specify a value it'll default to no value.",)
)]
y: Option<i32>,
// Or you can set the default
#[builder(default = 20)]
z: i32,
}
fn main() {
assert_eq!(Foo::builder().x(1).y(2).z(3).build(), Foo { x: 1, y: Some(2), z: 3 });
// Change the order of construction:
assert_eq!(Foo::builder().z(1).x(2).y(3).build(), Foo { x: 2, y: Some(3), z: 1 });
// Optional fields are optional:
assert_eq!(Foo::builder().x(1).build(), Foo { x: 1, y: None, z: 20 });
// This will not compile - because we did not set x:
// Foo::builder().build();
// This will not compile - because we set y twice:
// Foo::builder().x(1).y(2).y(3);
}
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