File: simple_option_map.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (22 lines) | stat: -rw-r--r-- 429 bytes parent folder | download | duplicates (3) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
 
// skip-filecheck
//@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2

#[inline(always)]
fn map<T, U, F>(slf: Option<T>, f: F) -> Option<U>
where
    F: FnOnce(T) -> U,
{
    match slf {
        Some(x) => Some(f(x)),
        None => None,
    }
}

// EMIT_MIR simple_option_map.ezmap.PreCodegen.after.mir
pub fn ezmap(x: Option<i32>) -> Option<i32> {
    map(x, |n| n + 1)
}

fn main() {
    assert_eq!(None, ezmap(None));
}