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Automatically transform String args to CString

1

In classes annotated with `CObj`, `CxxObj`, or `ObjC`, we should optionally transform `String` args passed to external functions into a `CString`, using a local zone. I.e. ```scala @CObj class Foo...

jokade

As a best practice, methods returning a wrapped C object should always take an implicit wrapper, i.e. ```scala def getFoo()(implicit w: CObjectWrapper[Foo]): Foo = extern ``` instead of ```scala def...

jokade

ObjC: generate msgSend() signatures on the fly

1

Required for iOS support, since the arm64 ABI doesn't work with vararg calls.

jokade

```scala @CObj class Foo private() ``` should produce ```scala class Foo (override val __ref: Ref[Byte]) { private def this() = this(Foo.__ext.foo_new()) } ```

jokade

scala-native/scala-native#1136

jokade

jokade

This currently fails: ```Scala @ObjC trait Foo { def foo(): Unit = extern } @ObjC class Bar extends Foo val bar: Bar = ... bar.foo() ```

jokade

```scala @retain case class Foo(id: NSInteger, date: NSDate, notes: String) ``` should transpile to ```scala case class Foo(id: NSInteger, date: NSDate, notes: String) extends Releasable { date.retain() def release(): Unit...

jokade

CObj: extern functions can't return abstract classes.

3

When an extern function have as return type an abstract type, the macro tries to instantiate it, resulting in a compile error. Example with `GtkBuilder`: ```scala @CObj class GtkBuilder {...

lolgab

Mixing abstract CObj classes in a hierarchy with concrete CObj classes exhibits strange behavior: ```scala @CObj class GObject @CObj abstract GtkWidget extends GObject @CObj class GtkWindow extends GtkWidget ``` aince...

jokade