hm. been looking and seems like ```cs public class Thing { void* whatever; public Thing(byte[]

hm. been looking and seems like

public class Thing
{
  void* whatever;

  public Thing(byte[] stuff)
  {
    fixed (void* ptr = stuff)
      whatever = ptr;
  }
}

public class Thing
{
  void* whatever;

  public Thing(byte[] stuff)
  {
    fixed (void* ptr = stuff)
      whatever = ptr;
  }
}

public class Thing
{
  void* whatever;

  public Thing(byte[] stuff)
  {
    fixed (void* ptr = stuff)
      whatever = ptr;
  }
}

public class Thing
{
  void* whatever;

  public Thing(byte[] stuff)
  {
    fixed (void* ptr = stuff)
      whatever = ptr;
  }
}

isn't valid
i've had no problems with that
but i guess i've been lucky?
so if that's not valid
wtf are you supposed to do instead
or have i just confused myself

AAqua hm. been looking and seems like ```cs public class Thing { void* whatever; ...

TechPizza•1/6/23, 9:49 PM

GC handle? pass a pointer in?

AquaOP•1/6/23, 9:49 PM

GC handle?

TechPizza•1/6/23, 9:49 PM

pin only when you need a pointer

AAqua GC handle?

TechPizza•1/6/23, 9:49 PM

GCHandle

TechPizza•1/6/23, 9:49 PM

long-term pinning managed memory is pretty bad though

AquaOP•1/6/23, 9:50 PM

i don't need it much but its useful in certain situations
the struct needs to be unmanagedunmanaged and so i just store a pointer

AquaOP•1/6/23, 9:50 PM

gchandle doesn't look unmanagedunmanaged...

TechPizza•1/6/23, 9:50 PM

GCHandle can be converted to and from IntPtr

AquaOP•1/6/23, 9:51 PM

i see

AquaOP•1/6/23, 9:51 PM

i suppose my question is

AquaOP•1/6/23, 9:51 PM

what is the correct way to store a pointer as a field
because seemingly my method that has worked fine every single time is not the correct way of doing it

Perksey•1/6/23, 9:51 PM

@grifon.petre this Silk.NET 3.0 design prototype may interest you

Volte•1/6/23, 9:51 PM

Perksey#6579

here's a better design with more implicitness https://sharplab.io/#v2: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

Original Message

Click here

Quoted by Perksey#6579

Perksey•1/6/23, 9:53 PM

essentially we store it as a ref (well, actually in a span, as ref fields are impossible atm if you're anyone other than the BCL)

TechPizza•1/6/23, 9:54 PM

net7 has ref fields my guy

Perksey•1/6/23, 9:54 PM

wait

Perksey•1/6/23, 9:54 PM

what

AquaOP•1/6/23, 9:54 PM

maybe i am too tired to understand but this just converts a string to span? or something?

AAqua maybe i am too tired to understand but this just converts a string to span? or s...

Perksey•1/6/23, 9:54 PM

no, that's just one of the uses

AquaOP•1/6/23, 9:54 PM

ah
ok

Perksey•1/6/23, 9:54 PM

    public static implicit operator PointerLike<T>(T[] a) => new(){Span = a};

    public static implicit operator PointerLike<T>(T[] a) => new(){Span = a};

PPerksey _what_

TechPizza•1/6/23, 9:54 PM

we got UnscopedRef, Scoped refs, and ref fields, pick your poison

Perksey•1/6/23, 9:55 PM

i pick rust when

AAqua hm. been looking and seems like ```cs public class Thing { void* whatever; ...

AquaOP•1/6/23, 9:55 PM

so my question is
what is the best way to do this
i need to store a pointer to something in a struct like this
currently i used the fixed thing but seemingly that's incorrect
so i have no idea
ive never had any issues with it
but i'd rather there wasn't a chance to have any issues with it

Perksey•1/6/23, 9:56 PM

...i just gave you an example

Perksey•1/6/23, 9:56 PM

don't think of it as storing a pointer

Perksey•1/6/23, 9:56 PM

store a ref

Perksey•1/6/23, 9:56 PM

a ref can be anything

Perksey•1/6/23, 9:56 PM

managed, unmanaged

Perksey•1/6/23, 9:56 PM

the only plus being if it's managed, it'll still be GC tracked

TechPizza•1/6/23, 9:56 PM

i bet rollie wants to store it in an ECS .)

AquaOP•1/6/23, 9:56 PM

no, it's because i use the struct as the input parameter for my texture creation

PPerksey store a ref

AquaOP•1/6/23, 9:57 PM

interesting, although i am not on .net 7 so i can't use ref fields
hm

Perksey•1/6/23, 9:57 PM

yeah

Perksey•1/6/23, 9:57 PM

that doesn't use .net 7 ref fields

Perksey•1/6/23, 9:57 PM

i didn't know they existed until 5 seconds ago

Perksey•1/6/23, 9:57 PM

so it'd be impressive if i managed to use ref fields before knowing about it!

AAqua no, it's because i use the struct as the input parameter for my texture creation

TechPizza•1/6/23, 9:58 PM

take a pointer to a ref struct and pass that when

PPerksey i didn't know they existed until 5 seconds ago

TechPizza•1/6/23, 9:58 PM

you can take pointers to object locals now as well

Perksey•1/6/23, 9:58 PM

is that a GC hole

AquaOP•1/6/23, 9:58 PM

so basically
if i am understanding this
storing it as a span is the correct way to do it
instead of storing a raw pointer?
i think i have confused myself

AAqua so basically if i am understanding this storing it as a span is the correct way ...

Perksey•1/6/23, 9:58 PM

well storing it as a ref

PPerksey is that a GC hole

TechPizza•1/6/23, 9:58 PM

nope, pointers to locals with GC refs are now correctly tracked

Perksey•1/6/23, 9:58 PM

so that could be ref fields, or if you're on anything but .net 7 span is the way to do that

AquaOP•1/6/23, 9:58 PM

ah
gotcha

TechPizza•1/6/23, 9:59 PM

so you can do this:

object local = new();
object* ptr = &local;
PassToNative(ptr);

object local = new();
object* ptr = &local;
PassToNative(ptr);

TechPizza•1/6/23, 9:59 PM

it's a bit cursed but super useful

Perksey•1/6/23, 9:59 PM

TechPizza•1/6/23, 10:03 PM

way better than GC handles. i'm already using it in my V8 bindings lol

AquaOP•1/6/23, 10:03 PM

so i changed the struct from the pointer to the span and it doesn't seem to be complaining so i'm happy with this, thanks!

hm. been looking and seems like ```cs public class Thing { void* whatever; public Thing(byte[]

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