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impl dyn Any for monomorphized dyn Trait #2571

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SoniEx2 opened this issue Oct 21, 2018 · 1 comment
Open

impl dyn Any for monomorphized dyn Trait #2571

SoniEx2 opened this issue Oct 21, 2018 · 1 comment
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A-trait-object Proposals relating to trait objects. T-lang Relevant to the language team, which will review and decide on the RFC.

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@SoniEx2
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SoniEx2 commented Oct 21, 2018 •
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there's no reason why stuff like this shouldn't be made more friendly and optimized (I shouldn't need two boxes for it to work): https://play.rust-lang.org/?version=stable&mode=debug&edition=2015&gist=7281cea78856a6bc6c8693dcb320b9d0

note that I'm talking specifically about fn<T: Foo>(t: T) -> Box<dyn Any> kinda usage. you wouldn't be able to take an arbitrary dyn Foo and turn it into an dyn Any (yet).
@Ixrec
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Ixrec commented Oct 21, 2018

I suspect the hard part of solving this use case is figuring out the general problem of multi-trait objects and trait object up/downcasting: #2035

@jonas-schievink jonas-schievink added A-trait-object Proposals relating to trait objects. T-lang Relevant to the language team, which will review and decide on the RFC. labels Nov 19, 2019
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