20 lines
625 B
Rust
20 lines
625 B
Rust
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pub struct Something;
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type Validator<'a> = dyn 'a + Send + Sync + Fn(&'a Something) -> Result<(), ()>;
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pub static ALL_VALIDATORS: &[(&'static str, &'static Validator)] =
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&[("validate that credits and debits balance", &validate_something)];
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fn or<'a>(first: &'static Validator<'a>, second: &'static Validator<'a>) -> Validator<'a> {
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//~^ ERROR return type cannot have an unboxed trait object
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return Box::new(move |something: &'_ Something| -> Result<(), ()> {
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first(something).or_else(|_| second(something))
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});
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}
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fn validate_something(_: &Something) -> Result<(), ()> {
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Ok(())
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}
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fn main() {}
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