'Has a' relationship for Rust's traits

This crate offers an alternative for a missing feature of the Rust Programming Language. That is, the possibility for traits to hold states.

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Documentation

http://proksima.github.io/has-doc/has/index.html

Simple example

```rust

[macro_use]

extern crate has;

use has::*;

struct Apple;

trait ApplesContainer: HasMut> { fn takeapple(&mut self) -> Option { self.getmut().pop() }

fn put_apple(&mut self, apple: Apple) {
    self.get_mut().push(apple);
}

}

[derive(Default)]

struct Basket { pub apples: Vec, }

impl ApplesContainer for Basket {} impl_has!(Basket, Vec, apples);

fn main() { let mut basket = Basket::default();

basket.put_apple(Apple);
basket.put_apple(Apple);
basket.put_apple(Apple);

basket.take_apple();

assert_eq!(basket.apples.len(), 2);

} ```