Sha256: 5a4e9284148747f00dbe08831b87c5c2528e68eff266a6f1996fcb11d00ed821
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Size: 1.99 KB
Versions: 38
Compression:
Stored size: 1.99 KB
Contents
/// Represents a contiguous region in memory.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct Region {
pub start: u32,
pub len: u32,
}
impl Region {
pub fn new(start: u32, len: u32) -> Self {
Self { start, len }
}
/// Checks if this `Region` overlaps with `rhs` `Region`.
pub fn overlaps(&self, rhs: Region) -> bool {
// Zero-length regions can never overlap!
if self.len == 0 || rhs.len == 0 {
return false;
}
let self_start = self.start as u64;
let self_end = self_start + (self.len - 1) as u64;
let rhs_start = rhs.start as u64;
let rhs_end = rhs_start + (rhs.len - 1) as u64;
if self_start <= rhs_start {
self_end >= rhs_start
} else {
rhs_end >= self_start
}
}
pub fn extend(&self, times: u32) -> Self {
let len = self.len * times;
Self {
start: self.start,
len,
}
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn zero_length() {
let r1 = Region::new(0, 0);
let r2 = Region::new(0, 1);
assert!(!r1.overlaps(r2));
let r1 = Region::new(0, 1);
let r2 = Region::new(0, 0);
assert!(!r1.overlaps(r2));
}
#[test]
fn nonoverlapping() {
let r1 = Region::new(0, 10);
let r2 = Region::new(10, 10);
assert!(!r1.overlaps(r2));
let r1 = Region::new(10, 10);
let r2 = Region::new(0, 10);
assert!(!r1.overlaps(r2));
}
#[test]
fn overlapping() {
let r1 = Region::new(0, 10);
let r2 = Region::new(9, 10);
assert!(r1.overlaps(r2));
let r1 = Region::new(0, 10);
let r2 = Region::new(2, 5);
assert!(r1.overlaps(r2));
let r1 = Region::new(9, 10);
let r2 = Region::new(0, 10);
assert!(r1.overlaps(r2));
let r1 = Region::new(2, 5);
let r2 = Region::new(0, 10);
assert!(r1.overlaps(r2));
}
}
Version data entries
38 entries across 38 versions & 1 rubygems