43 lines
728 B
Rust
43 lines
728 B
Rust
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use napi::bindgen_prelude::*;
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#[napi(iterator)]
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pub struct Fib {
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current: u32,
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next: u32,
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}
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#[napi]
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impl Generator for Fib {
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type Yield = u32;
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type Next = i32;
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type Return = ();
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fn next(&mut self, value: Option<Self::Next>) -> Option<Self::Yield> {
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match value {
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Some(n) => {
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self.current = n as u32;
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self.next = n as u32 + 1;
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}
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None => {
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let next = self.next;
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let current = self.current;
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self.current = next;
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self.next = current + next;
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}
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};
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Some(self.current)
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}
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}
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#[napi]
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#[allow(clippy::new_without_default)]
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impl Fib {
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#[napi(constructor)]
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pub fn new() -> Self {
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Fib {
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current: 0,
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next: 1,
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}
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}
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}
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