New version: ObjectiveC v4.0.0#155243
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- Registering package: ObjectiveC
- Repository: https://github.com/JuliaInterop/ObjectiveC.jl
- Created by: @maleadt
- Version: v4.0.0
- Commit: 806087a00c5a482e7e80affd5b151bd8ee67c326
- Reviewed by: @maleadt
- Reference: JuliaInterop/ObjectiveC.jl@806087a#commitcomment-185003030
- Description: Objective-C embedded in Julia
- Release notes:
UUID: e86c9b32-1129-44ac-8ea0-90d5bb39ded9 Repo: https://github.com/JuliaInterop/ObjectiveC.jl.git Tree: 5c6ea80558b987952ecdb2f0ae35497459c0b611 Registrator tree SHA: 50f504d641745716a5b3eabaf681d3a4937d2ae3
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May 12, 2026
…#63) Today, `@objcwrapper Foo <: Bar` emits an abstract `Foo` plus a concrete `FooInstance`. Anything stored as a `Foo` (containers, struct fields, inferred return types) carries an abstract type, which boxes in `Vector{Foo}`, breaks inference through property chains, and triggers dynamic dispatch in profiles. With this change, each `@objcwrapper Foo <: Bar` now emits *two* parallel definitions: ```julia struct Foo <: Object # concrete leaf (storage) ptr::id{Foo} end abstract type FooKind <: BarKind end # parallel lattice (dispatch) classkind(::Type{Foo}) = FooKind ``` Crucially, the inheritance stays flat: every wrapper is `<: Object` directly so that `Vector{NSString}` is bits-packed and inference sees fixed types through property access. This of course breaks dispatch on "non-leaf" classes, for which we introduce a parallel Kind lattice used by `@objcmethod` methods: ```julia @objcmethod foo(obj::KindOf{Bar}) = ... ``` The macro `KindOf{T}` lowers to trait dispatch on `Type{<:classkind(T)}` plus a method that forwards from untyped `Object` inputs. Multiple sites on the same function compose naturally -- Julia's dispatch picks the most specific Kind at the call site -- and downstream wrappers automatically participate by virtue of `SubKind <: ParentKind`. When the static type is known at the call site (the common case), the entry-then-body chain folds at compile time, so the trait dispatch is often zero-cost. Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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