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example use cases #13

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nikomatsakis opened this issue May 25, 2017 · 1 comment

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nikomatsakis commented May 25, 2017

It'd be great to accumulate more use-cases.

Open thread for suggestions. =)

nikomatsakis added the P-essential label

nielsle commented May 25, 2018

Delegation traits (Code stolen from EddyB)

// Potentially somewhere central, or generated per-trait.
trait Delegate/*Health*/ {
    type Delegatee;
    delegatee: Self::Delegatee;
}
impl<T: Delegate/*Health*/> Health for T
    where T::Delegatee: Health
{
    fn health(&self) -> u8 {
        self.delegatee.health()
    }
}
impl Delegate/*Health*/ for Player {
    delegatee => self.health;
}

rust-lang/rfcs#2393 (comment)

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