submitted 1 week ago by codeinabox@programming.dev to c/rust@programming.dev

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[-] anton@lemmy.blahaj.zone 7 points 1 week ago

With newtypes you can also emulate named args with a single struct. This also allows them to be passed on together.

struct RectArgs{
    x:i32,
    y:32,
    w:32,
    h:32,
}
impl Default for RectArgs{...}

Then the call site looks like this:

rect(RectArgs{
    x:0,
    y:0,
    w:30,
    h:20,
}
// with default arguments
rect(RectArgs{
    w:30,
    h:20,
    .. RectArgs::default ()
}

[-] syklemil@discuss.tchncs.de 1 points 1 week ago* (last edited 1 week ago)

Yeah, though in those cases you might get an extra question about why rect is a function and not a method, e.g.

Rect {
     w: 30,
     h: 20,
     .. RectArgs::default()
}.do_the_thing()

[-] anton@lemmy.blahaj.zone 1 points 1 week ago

I assumed the rect is a method on something like a graphics context or physics engine, but yeah.

[-] syklemil@discuss.tchncs.de 1 points 1 week ago

Yeah, decent assumption, I'll tone down my comment a bit.

this post was submitted on 22 Sep 2026

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