02:16 <daurnimator> hey is it possible to make slices compatible (memory layout-wise) with a struct iov?

05:04 <StateOff> Hi. Is there a way to get the type from *type?

05:05 <MajorLag> const X = *T; const Y = X.Child; //Y == T

05:05 <MajorLag> or const Y = comptime meta.Child(X);

05:08 <StateOff> Great. Will try. So far I got it working with @typeInfo(T).Pointer.child, but this seems like an overkill.

05:12 <StateOff> Another one: I try to get a struct's field address (as int) via typeInfo. What I did is @ptrToInt(struct_ptr) + @bitOffset(T, field.name)/8. I wonder if there is an easier way?

05:18 <MajorLag> @ptrToInt(&struct.field)

05:36 <StateOff> struct in this case is a 'type', and I can't do T.field

05:37 <MajorLag> So... if it's a type, what exactly does the pointer represent, since it isn't instantiated?

05:38 <MajorLag> You can get the relative offset of a field from the struct using @byteOffsetOf(T, field_name);

05:41 <StateOff> Yes that's what I'm doing. It seems a bit weird to ask for these things but I am writing a serializer so I need to introspect structs, follow certain pointers etc.

05:41 <StateOff> So for zig's comptime reflection got me pretty far.

05:42 <MajorLag> You might want to look at https://github.com/ziglang/zig/pull/1775

05:59 <StateOff> That's great! Thanks for the hint. Thant makes a good reference although my use case will be a bit different.

06:05 <StateOff> My stuff allows annotating a struct to handle pointers (Null, follow and serialize to an index, Keep live). Deserializing would relink the pointers based on the index, if they were followed. Live pointers will be just reinstantiated (only works if the app state did not change or the full state was brought back). Nulled pointers expect user handling but may inject some need bombs into the application ;)

06:06 <StateOff> Lot's of rope.

11:54 <Hejsil> Seems like llvm can optimize chaining ifs of mem.eql into some kind of statemachine... I have just been really outsmarted by the compiler

11:54 <Hejsil> Relevant code: https://godbolt.org/z/-07wYb