forked from Mirror/wren
48bdbc7745
Most of the pieces are there: - You can declare a foreign class. - It will call your C function to provide an allocator function. - Whenever a foreign object is created, it calls the allocator. - Foreign methods can access the foreign bytes of an object. - Most of the runtime checking is in place for things like subclassing foreign classes. There is still some loose ends to tie up: - Finalizers are not called. - Some of the error-handling could be better. - The GC doesn't track how much memory a marked foreign object uses.
49 lines
1.0 KiB
Plaintext
49 lines
1.0 KiB
Plaintext
// Class with a default constructor.
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foreign class Counter {
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foreign increment(amount)
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foreign value
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}
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var counter = Counter.new()
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IO.print(counter.value) // expect: 0
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counter.increment(3.1)
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IO.print(counter.value) // expect: 3.1
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counter.increment(1.2)
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IO.print(counter.value) // expect: 4.3
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// Foreign classes can inherit a class as long as it has no fields.
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class PointBase {
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inherited() {
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IO.print("inherited method")
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}
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}
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// Class with non-default constructor.
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foreign class Point is PointBase {
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construct new() {
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IO.print("default")
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}
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construct new(x, y, z) {
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IO.print(x, ", ", y, ", ", z)
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}
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foreign translate(x, y, z)
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foreign toString
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}
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var p = Point.new(1, 2, 3) // expect: 1, 2, 3
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IO.print(p) // expect: (1, 2, 3)
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p.translate(3, 4, 5)
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IO.print(p) // expect: (4, 6, 8)
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p = Point.new() // expect: default
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IO.print(p) // expect: (0, 0, 0)
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p.inherited() // expect: inherited method
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var error = Fiber.new {
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class Subclass is Point {}
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}.try()
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IO.print(error) // expect: Class 'Subclass' cannot inherit from foreign class 'Point'.
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