mixin

mixin struct or enum

mixin not only struct fields, but also impl funcs and traits.

example ''' #[cfg(test)] mod tests { use mixin::{declare, expand, insert}; use serde::{Deserialize, Serialize};

//use declare to register Person to mixin
#[declare]
#[derive(Debug, PartialEq, Serialize, Deserialize, Default)]
pub struct Person {
    pub name: String,
    pub age: i32,
}

//use "expand" to register impl for Person to mixin
#[expand]
impl Person {
    pub fn print(&self) {
        println!("{:?}", self);
    }
}

//use "insert" to mixin Person fields and methods, and Student is also registed to mixin.
#[insert(Person)]
#[derive(Debug, PartialEq, Serialize, Deserialize, Default)]
pub struct Student {
    pub name: String,
    pub school: String,
    pub school_addr: String,
}

//Employee mixin with Student，include the part of Person， and the filed 'name' cover 'name' in Student and Person。
#[insert(Student)]
#[derive(Debug, PartialEq, Serialize, Deserialize, Default)]
pub struct Employee {
    pub name: String,
    pub company: String,
    pub workage: i32,
}

#[test]
fn test_mixin() {
    let mut e = Employee {
        company: "xjplke".into(),
        workage: 1,
        age: 25,
        name: "xjplke".into(),
        school: "BJU".into(),
        school_addr: "Beijin".into(),
    };
    e.print();
    println!("persion info {:?}", e.get_person());

    let p = e.get_person();
    assert_eq!(
        p,
        Person {
            name: "xjplke2".into(),
            age: 25,
        }
    );
    p.print();
    let s = e.get_student();
    assert_eq!(
        s,
        Student {
            age: 25,
            name: "xjplke3".into(),
            school: "BJU".into(),
            school_addr: "Beijin".into(),
        }
    );
    s.print();

    let sp = s.get_person();
    assert_eq!(p, sp);

    let np = Person {
        name: "xjplke4".into(),
        age: 30,
    };
    e.set_person(&np);

    assert_eq!(e.get_person(), np);

    let e_str = serde_json::to_string(&e).unwrap();
    println!("e_str = {}", e_str);
}

} '''

more examples is in tests