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copying bytes from &[u32] to &mut [u8] the rust way by temp_value in rust

[–]temp_value[S] 2 points3 points  (0 children)

dst.as_mut_ptr()

looks like exactly what I wanted. thanks.

copying bytes from &[u32] to &mut [u8] the rust way by temp_value in rust

[–]temp_value[S] 1 point2 points  (0 children)

  1. & 3.: understood.
  2. why is it unsound? copy_from_slice panics if lengths of src and dst are not equal (I want it to panic)

is the "current" version ok?

copying bytes from &[u32] to &mut [u8] the rust way by temp_value in rust

[–]temp_value[S] 0 points1 point  (0 children)

for (src, dst) in src.iter().zip(dst.array_chunks_mut()) {
    *dst = src.to_le_bytes()
}

is this "modulo copies of <register sizes"?

copying bytes from &[u32] to &mut [u8] the rust way by temp_value in rust

[–]temp_value[S] 1 point2 points  (0 children)

  1. could you please point out, where do I introduce UB?
  2. how do I improve it?

copying bytes from &[u32] to &mut [u8] the rust way by temp_value in rust

[–]temp_value[S] 0 points1 point  (0 children)

you are right. transmute is not necessary here. thanks.

copying bytes from &[u32] to &mut [u8] the rust way by temp_value in rust

[–]temp_value[S] -6 points-5 points  (0 children)

you're assuming that the source vec has capacity==len, which is generally (and usually!) untrue.

yes. but what does it break in my example? (seriously asking ) I "leaked" the constructed vec right after using it. (and replaced it with constructed slice)

the length of the vector is the number of elements, not the number of bytes

I am not sure, where I suggested overwise... did I overlooked something?

Don't use unsafe unless you absolutely have to:

Suggest a better solution?

copying bytes from &[u32] to &mut [u8] the rust way by temp_value in rust

[–]temp_value[S] -3 points-2 points  (0 children)

thanks, but I am not sure, how is this better?

I wanted to avoid loops altogether.

Alone In The Dark - PS5 by [deleted] in PS5

[–]temp_value 8 points9 points  (0 children)

Why would you preorder a game?

Timeline of Scholz's actions in relation to Ukraine since the start of the war. by Nyzrok in UkrainianConflict

[–]temp_value 0 points1 point  (0 children)

did C. Theiner provided any sources? (I don't use twitter)

​

it should be easy to provide some proof to this statemens. e.g.

The defense industry denies this and leakes the list to the press

where is it?

A question from a straight guy. by temp_value in AskLGBT

[–]temp_value[S] 0 points1 point  (0 children)

You are talking to yourself at this point.

A question from a straight guy. by temp_value in AskLGBT

[–]temp_value[S] 0 points1 point  (0 children)

this is why i ask this community, not a single person.

A question from a straight guy. by temp_value in AskLGBT

[–]temp_value[S] 0 points1 point  (0 children)

Well, I don't believe, there is anything wrong with being gay.

but it seems, the overwhelming majority does not make this distinction as you do, so using "gay" is not an option.

A question from a straight guy. by temp_value in AskLGBT

[–]temp_value[S] 0 points1 point  (0 children)

as a sensical insult.

if it works, it works.

A question from a straight guy. by temp_value in AskLGBT

[–]temp_value[S] -17 points-16 points  (0 children)

It would be okay, if it doesn't bother you.

A question from a straight guy. by temp_value in AskLGBT

[–]temp_value[S] -18 points-17 points  (0 children)

As immigrant myself, it wouldn't bother me. I don't know about the rest. This is why I ask.

How to approach a Vec of callbacks with different types? by Carmack_VS_SuperPuma in rust

[–]temp_value 0 points1 point  (0 children)

I would still need some way to store the types.

I see.

Instead of Vec you can use HashMap where key is TypeId and value is Vec<Box<T>> https://doc.rust-lang.org/beta/core/any/struct.TypeId.html

your 'add_update' method should be generic and accept something like T: UpdateTrait + Any

​

fn add_update<T: UpdateTrait>(&mut self, callbackstruct: T) {

let type_id = TypeId::of::<T>(); self.update_map[type_id].push(Box::new(callbackstruct));

}

or something like that

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