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use typed_builder::TypedBuilder;
#[derive(Debug, PartialEq, TypedBuilder)]
#[builder(field_defaults(setter(prefix = "with_", suffix = "_value")))]
struct Foo {
// Mandatory Field:
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))]
y: Option<i32>,
// Or you can set the default
#[builder(default = 20)]
z: i32,
}
fn main() {
assert_eq!(
Foo::builder().with_x_value(1).with_y_value(2).with_z_value(3).build(),
Foo { x: 1, y: Some(2), z: 3 }
);
// Change the order of construction:
assert_eq!(
Foo::builder().with_z_value(1).with_x_value(2).with_y_value(3).build(),
Foo { x: 2, y: Some(3), z: 1 }
);
// Optional fields are optional:
assert_eq!(Foo::builder().with_x_value(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().with_x_value(1).with_y_value(2).with_y_value(3);
}
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