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Bob Nystrom 48bdbc7745 First pass at implementing foreign classes.

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.

2015-08-15 12:07:53 -07:00

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 #include "wren.h"
 WrenForeignMethodFn foreignClassBindMethod(const char* signature);
 void foreignClassBindClass(
     const char* className, WrenForeignClassMethods* methods);