Macro std::unlikely

macro unlikely($cond) { ... }

source

Hint to the compiler that a particular boolean expression is unlikely to be true.

Useful for branch prediction. See also likely.

Example

use random::thread_rng;
use std::unlikely;

let v: f64 = thread_rng().next_float();
if unlikely!(v < 0.01) {
    // ...
}
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