As long as "you" are the person who owns the type, yeah, but I suspect that's not what you mean. Coherence requires that you only implement traits for types if you own either the trait or the type (or both). You can't implement a 3rd party trait for a 3rd party type, since then there could be multiple such implementations for a given (trait, type) pair, and coherence would be broken.
On Tue, Nov 5, 2013 at 2:28 PM, Ziad Hatahet <[email protected]> wrote: > On Tue, Nov 5, 2013 at 9:17 AM, Patrick Walton <[email protected]>wrote: > >> On 11/5/13 2:44 AM, spir wrote: >> >>> Why not just add a declaration of the trait at the top of the struct >>> type def? >>> >>> struct PairList<Val> : Iterable { >>> >> >> You can implement traits on types that aren't structs. > > > > Isn't another effect of this is the ability to "monkey-patch" structs to > implement extra methods or traits? E.g. you can later in implement a > to_str() method for a type, or implement certain traits, like Clone or Drop. > > > -- > Ziad > > > _______________________________________________ > Rust-dev mailing list > [email protected] > https://mail.mozilla.org/listinfo/rust-dev > >
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