Unpack Query into a struct?

[storm ridge]

What I'd like to do is...

Instead of

fn system(query: Query<(&A, &B)>) {
    ...
    for (a, b) in query.iter {
    ...
}

I would like to

fn system(query: Query<&MyStructType>) {
    ...
    for MyStructType{ a, b } in query.iter {
    ...
}

I'll happily elaborate if it helps.

I believe I want my type to implement WorldQuery but it looks like there are many ways to get lost in this code. I could cheat and make the type's ::new() function take a tuple, but that seems yuck and would add another line. 😕

Interesting. "But you can", you say.

I mean, I've done it tons. Let me think and make sure I didn't just play myself....

Yeah. Heh. NEVERMIND! I guess it's just a slightly new application in my case and my brain hiccuped. Thanks anyhow ! 🙂

[rustic cloud]

Have you seen the WorldQuery derive?

[storm ridge]

nope. I'll check it out. But IINM I got what I need.

[rustic cloud]

Please don't try and impl it by hand unless you have a very good reason :p

[storm ridge]

well, example number two above will work. It's nothing special. maybe I'm doubly confused.

the elements of MyStructType will be Transform ... the usual suspects. My components in some cases.

If I'll get tangled up I'll post back. I will definitely look into derive WQ as it'll probably resolve the current confusion (and more). Thanks @rustic cloud !