WIP - support for dart26

[Buggaboo]

Relevant changes since 2.6

• Changed Struct<T> to Struct
• To dereference a Struct to get to the values you need to ref
• free and allocate are part of package:ffi as independent functions
• load and store became a getter/setter called value
• elementAt has indexing syntax-sugar i.e. ptr[i]
• asExternalType bla, is replaced with asTypedList to create dart native list types

Update

• I'm not 100% sure that free(someUtf8Instance) does the job, since Utf8 extends Struct and does not clearly address the Uint8 allocation.
• To move forward, I think we should reimplement all ByteBuffer related stuff as proper dart Structs.
• We should check if attachFinalizer is available, and hook on free from there. (TODO anyone else other than me)

At least everything generates, compiles, and the coverage is back to 100%.

This addresses Issue #54

Sources:

• package:ffi allocate free
• ffi samples
• this load/store related commit

[nalenz-objectbox]

• FFI 0.1.3 has been released, so this line can be changed to ffi: ^0.1.3
• to improve our analytics page, I think it's best to check the arising warnings using pana beforehand, maybe even before pushing
• unfortunately, it seems like the contribution guide needs to be updated in that case, because pana only accepts code formatted with dartfmt, not dartfmt -l 120
• Dart 2.6 has been released, so we can use sdk: ">=2.6.0 <3.0.0" as environment dependency. This needs to be changed in the generator as well
• at least during testing and pana checks, I guess also use objectbox: path: .. instead of the objectbox: 0.4.0 pub.dev dependency for objectbox_generator?
• the code can be cleaned from a lot of unnecessary imports and other hints and (linter) warnings, as reported by pana
• in bindings.dart, the following error is reported for lines 157 and 158: The type argument for the pointer, 'NativeFunction<Void Function(Pointer<OBX_bytes_array>)>' must be a 'NativeFunction' in order to use 'asFunction'. Try changing the type argument to be a 'NativeFunction'.

[vaind]

• unfortunately, it seems like the contribution guide needs to be updated in that case, because pana only accepts code formatted with dartfmt, not dartfmt -l 120

pana takes the -l argument as well. While it will still report on pub.dev, these suggestions have no score impact.

• at least during testing and pana checks, I guess also use objectbox: path: .. instead of the objectbox: 0.4.0 pub.dev dependency for objectbox_generator?

Hmm, what does that help with?

[nalenz-objectbox]

Hmm, what does that help with?

Actually nothing really, just shortly during development right now, because the current regular objectbox pub.dev package still contains the Dart <=2.5.0 restriction