mirror of https://github.com/poanetwork/hbbft.git
28 lines
748 B
Rust
28 lines
748 B
Rust
//! Utility functions
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//!
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//! A collection of miscellaneous functions that are used in the tests, but are generic enough to be
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//! factored out.
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use rand::Rng;
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/// Try-return a result, wrapped in `Some`.
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///
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/// Like `try!`, but wraps into an `Option::Some` as well. Useful for iterators
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/// that return `Option<Result<_, _>>`.
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#[macro_export]
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macro_rules! try_some {
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($expr:expr) => {
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match $expr {
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Ok(v) => v,
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Err(e) => return Some(Err(From::from(e))),
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}
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};
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}
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/// Return true with a certain `probability` ([0 .. 1.0]).
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pub fn randomly<R: Rng>(probability: f32, rng: &mut R) -> bool {
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assert!(probability <= 1.0);
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assert!(probability >= 0.0);
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rng.gen_range(0.0, 1.0) <= probability
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}
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