28 lines
475 B
Rust
28 lines
475 B
Rust
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use intertrait::cast::*;
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use intertrait::*;
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use std::sync::Arc;
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#[cast_to([sync, sync] Greet)]
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struct Data;
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trait Source: CastFromSync {}
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trait Greet {
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fn greet(&self);
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}
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impl Greet for Data {
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fn greet(&self) {
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println!("Hello");
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}
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}
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impl Source for Data {}
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fn main() {
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let data = Arc::new(Data);
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let source: Arc<dyn Source> = data;
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let greet = source.cast::<dyn Greet>();
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greet.unwrap_or_else(|_| panic!("can't happen")).greet();
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}
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