delegatemethod-rs

Delegate method calls to a field.

Examples

Suppose you have a struct called Inner, with methods fn1 and fn2.

You have another struct called Outer with fields using Inner as type.

You can use delegate_method to forward some method implementations to the fields.

    #[derive(Copy, Clone)]
    struct Outer {
        inner1: Inner,
        inner2: Inner,
    }

    impl Outer {
        delegate_method! {
            // the <as FieldType> is optional below
            // it is only used for methods without self or &self or &mut self argument
            inner as Inner:
            pub fn fn1();
            
            // here comes another group, using another field.
            inner2 as Inner:
            pub fn fn2() -> usize;
        }
    }

Acknowledgements

• The idea comes from Tommy McGuire's blog, but adjusted to match the Rust syntax better.