#derive #from

macro type-change

Convert between different types of the same field name

1 unstable release

0.1.0 Oct 31, 2021

#300 in Procedural macros

Custom license

6KB
66 lines

type-change

It can be converted to another type with the same name field.

Usage

use type_change::From;

#[derive(Clone)]
struct Foo {
    id: i64,
    name: String,
}

#[derive(From)]
#[from(Foo)]
struct Bar {
    id: i64,
    name: String,
}

// equal to follows
//
// impl From<Foo> for Bar {
//     fn from(foo: Foo) -> Bar {
//         Bar { id: foo.id, name: foo.name }
//     }
// }
//

let foo = Foo { id: 1, name: "foo".to_string() };
let bar = Bar { name: "bar".to_string(), ..foo.clone().into() };
assert_eq!(foo.id, bar.id);

Notes

  • Only struct with the same field name can be converted.
  • All field names must match and be accessible.

Contributing

Thanks!


lib.rs:

It can be converted to another type with the same name field.

Usage

use type_change::From;

#[derive(Clone)]
struct Foo {
    id: i64,
    name: String,
}

#[derive(From)]
#[from(Foo)]
struct Bar {
    id: i64,
    name: String,
}

// equal to follows
//
// impl From<Foo> for Bar {
//     fn from(foo: Foo) -> Bar {
//         Bar { id: foo.id, name: foo.name }
//     }
// }
//

let foo = Foo { id: 1, name: "foo".to_string() };
let bar = Bar { name: "bar".to_string(), ..foo.clone().into() };
assert_eq!(foo.id, bar.id);

Notes

  • Only struct with the same field name can be converted.
  • All field names must match and be accessible.

Contributing

Thanks!

Dependencies

~285–700KB
~17K SLoC