Crate if_empty_derive

Derive macro complementing if_empty

This crate provides a derive macro implementing the if_empty function if the type has a is_empty function.

Examples

#[derive(IfEmpty)]
struct Example {
    value: String,
}

impl Example {
    fn is_empty(&self) -> bool {
        self.value.is_empty()
    }
}

let example = Example {
    value: String::new(),
};

assert!(example.value.is_empty());
assert_eq!(example.if_empty(Example {value: "a default".to_string()}).value, "a default");

Derive Macros

IfEmpty

Implement if_empty on types with is_empty functions