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raw pointer experiment

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This commit is contained in:
Daniel Bulant 2023-12-17 15:55:59 +01:00
parent ec8ec31063
commit eff6831940
1 changed files with 12 additions and 3 deletions
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15
2023/16/src/main.rs
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@ -292,16 +292,26 @@ fn part1() {
println!("Part 1 count: {}", count);
}
#[derive(Clone)]
struct Sendable(*const Vec<Vec<MapPoint>>);
unsafe impl Send for Sendable {}
fn part2() {
let (max_point, rows, columns) = setup();
let mut threads = Vec::with_capacity(4);
let rows = Arc::new(rows);
let columns = Arc::new(columns);
let rows = &rows as *const Vec<Vec<MapPoint>>;
let columns = &columns as *const Vec<Vec<MapPoint>>;
let rows = Sendable(rows);
let columns = Sendable(columns);
for vector in [VEC_LEFT, VEC_RIGHT, VEC_UP, VEC_DOWN] {
let rows = rows.clone();
let columns = columns.clone();
threads.push(
std::thread::spawn(move || {
let rows = rows;
let columns = columns;
let rows = unsafe { &*rows.0 };
let columns = unsafe { &*columns.0 };
let mut count = 0;
let is_vert = vector.is_vertical();
let is_pos = vector.is_positive();
@ -314,7 +324,6 @@ fn part2() {
let count_here = get_count(max_point, &rows, &columns, beam);
if count_here > count {
count = count_here;
println!("New max: {} at {},{}", count, num, num2);
}
}
count