delegate-attr

Attribute proc-macro to delegate method to a field.

Examples

Delegate impl block

``` use delegate_attr::delegate;

struct Foo(String);

[delegate(self.0)]

impl Foo { fn asstr(&self) -> &str; fn intobytes(self) -> Vec; }

let foo = Foo("hello".toowned()); asserteq!(foo.asstr(), "hello"); asserteq!(foo.into_bytes(), b"hello"); ```

``` use delegate_attr::delegate;

struct Foo { a: Vec, }

[delegate(self.a)]

impl Foo { fn len(&self) -> usize; fn get(&self, index: usize) -> Option<&T>; fn push(&mut self, value: T); }

let mut foo = Foo { a: vec![1] }; asserteq!(foo.get(0), Some(&1)); foo.push(10); asserteq!(foo.get(1), Some(&10)); assert_eq!(foo.len(), 2); ```

Delegate single method

``` use delegate_attr::delegate;

struct Foo(Vec);

impl Foo { #[delegate(self.0)] fn len(&self) -> usize; }

let foo = Foo(vec![1]); assert_eq!(foo.len(), 1); ```