small_derive_deref

This crate adds #[derive(Deref)] #[derive(DerefMut].

It works for:

• Structs with one field
• Structs with multiple fields
  • Need #[DerefTarget] / #[DerefMutTarget].
• Tuples with one field
• Tuples with multiple fields
  • Will use the first field

Known Limitations

• Generics aren't properly implemented, works for the example and a few other primitive cases
• The type of the fields for #[DerefTarget] and #[DerefMutTarget] must be the same

Examples

use std::ops::DerefMut;
use small_derive_deref::{Deref, DerefMut};

#[derive(Deref, DerefMut)]
struct WrapperStructDifferentTargetsGenerics<'a> {
     #[DerefTarget]
     field: &'a str,
     #[DerefMutTarget]
     field_mut: &'a str,
 }
 
 let mut w = WrapperStructDifferentTargetsGenerics { field: "not rust", field_mut: "rust"};
 *w = "rUst";
 assert_eq!(*w, "not rust");
 assert_eq!(*w.deref_mut(), "rUst");
 
 
 #[derive(Deref, DerefMut)]
 struct WrapperTuple(i32, i32);
 
 let mut w = WrapperTuple(1, 3);
 *w *= 2;
 assert_eq!(*w, 2);
 assert_eq!(*w.deref_mut(), 2);

License

MIT or Apache-2.0