I'm coming from golang.
In Golang there is a fieldalignment project which aligns fields for a better performances (Saving a Third of Our Memory by Re-ordering Go Struct Fields | Lane's Blog).
Is in Rust something similar?
It's needed? Or the compiler aligns fields itself for better performances?
The layout of all non-#[repr(C)] types is unspecified exactly for this reason. I do recall seeing that the compiler performs some sort of field reordering for making structs smaller.
Here's a small playground that demonstrates field reordering.
Indeed. Rust has been reordering struct fields to reduce padding for years now. See
Or here's a prose writeup about it:
What a pleasure this language and what a pleasure this community of wonderful people! Thank you so much!
I choose the first answer as the solution, for the speed.
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