Condition inside my_iterator.for_each

help
1

Hi ,i have working on pong game and try to make it work with rayon:

this works:
self.my_vec_balls.par_iter_mut().for_each(|ball| ball.rect.translate(ball.vel));
this doesn't work:
let par_iter_balls = self.my_vec_balls.par_iter_mut();
for ball in (self.my_vec_balls.par_iter_mut()):
ball.rect.translate(ball.vel);

i have conditions for bouncing with walls but i have no idea how to insert condition inside for_each.

2

Your description is rather vague. It is entirely possible to include an if expression inside the closure you pass to for each. But you probably tried that already.

3

You can't use for ball in parallel_iterator, because for loops are strictly for Iterator.

You can use an arbitrary block of code in the parallel for_each though:

self.my_vec_balls.par_iter_mut().for_each(|ball| {
    ball.prepare();
    if ball.is_red() {
        // do red stuff
    } else {
        // do other stuff
    }
    ball.finish();
});
4

thank you !

5

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