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use struct_patch::Patch;
#[derive(Default, Patch)]
#[patch(attribute(derive(Debug, Default)))]
struct Item {
field_complete: bool,
field_int: usize,
field_string: String,
}
// Generated by Patch derive macro
//
// #[derive(Debug, Default)] // pass by patch(attribute(...))
// struct ItemPatch {
// field_complete: Option<bool>,
// field_int: Option<usize>,
// field_string: Option<String>,
// }
fn main() {
let mut item = Item::default();
let mut patch: ItemPatch = Item::new_empty_patch();
patch.field_int = Some(7);
assert_eq!(
format!("{patch:?}"),
"ItemPatch { field_complete: None, field_int: Some(7), field_string: None }"
);
item.apply(patch);
assert!(!item.field_complete);
assert_eq!(item.field_int, 7);
assert_eq!(item.field_string, "");
#[cfg(feature = "op")]
{
let another_patch = ItemPatch {
field_complete: None,
field_int: None,
field_string: Some("from another patch".into()),
};
let new_item = item << another_patch;
assert!(!new_item.field_complete);
assert_eq!(new_item.field_int, 7);
assert_eq!(new_item.field_string, "from another patch");
let the_other_patch = ItemPatch {
field_complete: Some(true),
field_int: None,
field_string: None,
};
let final_item = new_item << the_other_patch;
assert!(final_item.field_complete);
assert_eq!(final_item.field_int, 7);
assert_eq!(final_item.field_string, "from another patch");
}
}
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