mirror of https://github.com/rust-lang/rust.git
20 lines
359 B
Rust
20 lines
359 B
Rust
#[inline(always)]
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fn map<T, U, F>(slf: Option<T>, f: F) -> Option<U>
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where
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F: FnOnce(T) -> U,
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{
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match slf {
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Some(x) => Some(f(x)),
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None => None,
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}
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}
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// EMIT_MIR simple_option_map_e2e.ezmap.PreCodegen.after.mir
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pub fn ezmap(x: Option<i32>) -> Option<i32> {
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map(x, |n| n + 1)
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}
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fn main() {
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assert_eq!(None, ezmap(None));
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}
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