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https://github.com/rust-lang/rust
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16 lines
433 B
Rust
16 lines
433 B
Rust
pub fn iso<A, B, F1, F2>(a: F1, b: F2) -> (Box<dyn Fn(A) -> B>, Box<dyn Fn(B) -> A>)
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where
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F1: (Fn(A) -> B) + 'static,
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F2: (Fn(B) -> A) + 'static,
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{
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(Box::new(a), Box::new(b))
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}
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pub fn iso_un_option<A, B>() -> (Box<dyn Fn(A) -> B>, Box<dyn Fn(B) -> A>) {
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let left = |o_a: Option<_>| o_a.unwrap();
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//~^ ERROR overflow
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let right = |o_b: Option<_>| o_b.unwrap();
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iso(left, right)
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}
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fn main() {}
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