50 lines
1.2 KiB
Rust
50 lines
1.2 KiB
Rust
use rand::rngs::StdRng;
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use rand::Rng;
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pub trait RandomExt<T> {
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fn gen_interval(&mut self, min: T, max: T) -> T;
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}
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impl RandomExt<f32> for StdRng {
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fn gen_interval(&mut self, min: f32, max: f32) -> f32 {
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if min == max {
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return min;
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}
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let minimum = f32::min(min, max);
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let maximum = f32::max(min, max);
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let diff = maximum - minimum;
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let x: f32 = self.gen();
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x * diff + minimum
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}
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}
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impl RandomExt<f64> for StdRng {
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fn gen_interval(&mut self, min: f64, max: f64) -> f64 {
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if min == max {
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return min;
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}
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let minimum = f64::min(min, max);
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let maximum = f64::max(min, max);
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let diff = maximum - minimum;
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let x: f64 = self.gen();
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x * diff + minimum
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}
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}
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#[cfg(test)]
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mod test {
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use rand::prelude::StdRng;
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use rand::{Rng, SeedableRng};
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#[test]
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fn test_gen() {
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let random_seed = rand::random();
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let mut rng = StdRng::seed_from_u64(random_seed);
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for _ in 0..1000 {
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let random_number: f64 = rng.gen();
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assert!(random_number < 1.);
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assert!(random_number > 0.);
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}
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}
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}
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