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add note on no by-value methods

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noteuclid 2026-09-24 18:42:15 +03:00
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@ -5,5 +5,6 @@ A relatively simple example wrapper working (kinda) as a *by-value* `dyn Trait`.
Limitations: Limitations:
* The wrapper size is fixed. The content either fits, or it doesn’t compile. * The wrapper size is fixed. The content either fits, or it doesn’t compile.
* Supporting each trait requires a bit of code, as there is no way to express “for each *trait* X” in Rust. * Supporting each trait requires a bit of code, as there is no way to express “for each *trait* X” in Rust.
* Like with `Box<dyn _>`, you can’t call by-value methods on the content.
* Requires unstable features (notably `ptr_metadata`, others are probably avoidable). * Requires unstable features (notably `ptr_metadata`, others are probably avoidable).
* `unsafe` here, `unsafe` there, `unsafe` everywhere! (It does pass Miri though). * `unsafe` here, `unsafe` there, `unsafe` everywhere! (It does pass Miri though).