upcast

Crates.io	upcast
lib.rs	upcast
version	0.1.0
created_at	2019-08-09 21:56:44.788855+00
updated_at	2019-08-09 21:56:44.788855+00
description	Simple trait for helping along upcasting of dyn supertraits. ``` pub trait A {} pub trait B: A + Upcast {} // Put this in your library impl<'a, T: A + 'a> UpcastFrom for dyn A + 'a { fn up_from(value: &T) -> &(dyn A + 'a) { value } fn up_from_mut(value: &mut T) -> &mut (dyn A + 'a) { value } } // Now your users can do an upcast if needed, or you can within implementations fn do_cast(b: &dyn B) -> &dyn A { b.up() } ```
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repository	https://github.com/connicpu/upcast
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id	155477
size	3,151

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