const thing :u8= undefined;
```What does it mean to do this in Zig?
How is it different than other languages, and/or what is it doing exactly?
_(eg: I understand C, but have no clue how that would map to any C concept at all)_#[solved] Understanding undefined
keen wedge
twilit pecan
its the same as not giving a value to a variable in C
keen wedge
Also, is it the same as doing undefined for the default values of struct fields, or is that different?
twilit pecan
var n: c_int = undefined; == int n;
keen wedge
so if I try to read it it would be garbage, and not zero-initialized?
twilit pecan
yes
hybrid portal
xy problem perhaps. what do you want to do?
static flint
Also, is it the same as doing `undefined` for the default values of struct field...
You should try to not use undefined as the default value for a struct field, since that's an unsafe default
keen wedge
const Result = struct {
stdout :Data,
stderr :Data,
code :u8= undefined, // <------------
}
```This being the returning error of a shell commandbut if Data, aka ArrayList is uninitialized, then it will just be empty. but u8 0 initialized could mean success
hybrid portal
uninitalized does not mean "empty"
empty implies the array list is already initialized
keen wedge
Can you access an arraylist before its even ArrayList(T).init(allocator)?
if not, then its empty
hybrid portal
Can you access an arraylist before its even `ArrayList(T).init(allocator)`?
not as far as i know
keen wedge
empty-uninitialized, empty-initialized its both empty
0 is not empty, its success
big difference
that's what I was trying to solve
hybrid portal
i dont understand what you are trying to do
"u8 being initialized is success" does not sound like behavior you should rely on
hybrid portal
empty-uninitialized, empty-initialized its both empty
empty has invariance though, its a state
an uninitalized array list is nothing, you cant get anything meaningful out of it
keen wedge
empty has invariance though, its a state
technically, maybe
in my brain, empty is just empty
"whatever version of empty this language technicalities implies as empty"
keen wedge
"`u8` being initialized is success" does not sound like behavior you should rely...
that's exactly the problem I'm trying to solve
0 should NOT be synonym with empty, when 0 means success
and uninitialized means garbage, so not reliable either
keen wedge
aka ?T= null is the only option
keen wedge
why a `u8`
I don't write shell rules
hybrid portal
isnt there a @boolFromInt?
twilit pecan
thats called != 0
keen wedge
why would I want to return a bool from a shell command?
hybrid portal
idk anything about shell commands, so idk
keen wedge
I want the exit code and a couple of strings
twilit pecan
aka `?T= null` is the only option
why do you not want to use optionals?