From 5405811eaa2af3e84cc3423010488d8429657bb8 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Fri, 20 Jan 2023 17:49:23 -0330
Subject: round displacement when converting units

---
 src/lib.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
index cd3320a..c41b791 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,19 @@
 pub mod volume;
 
 type Percent = u8;
+
+pub fn round<F, I>(f: F, digits: I) -> f64
+where
+    F: Into<f64>,
+    I: Into<i32> + Copy,
+{
+    (f.into() * 10_f64.powi(digits.into())).round() / 10_f64.powi(digits.into())
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn round() {
+        assert_eq!(super::round(0.123456789, 3), 0.123);
+    }
+}
-- 
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