public static RubyClass createPointerClass(Ruby runtime, RubyModule module) { RubyClass pointerClass = module.defineClassUnder( "Pointer", module.getClass(AbstractMemory.ABSTRACT_MEMORY_RUBY_CLASS), RubyInstanceConfig.REIFY_RUBY_CLASSES ? new ReifyingAllocator(Pointer.class) : PointerAllocator.INSTANCE); pointerClass.defineAnnotatedMethods(Pointer.class); pointerClass.defineAnnotatedConstants(Pointer.class); pointerClass.setReifiedClass(Pointer.class); pointerClass.kindOf = new RubyModule.KindOf() { @Override public boolean isKindOf(IRubyObject obj, RubyModule type) { return obj instanceof Pointer && super.isKindOf(obj, type); } }; module.defineClassUnder( "NullPointerError", runtime.getRuntimeError(), runtime.getRuntimeError().getAllocator()); // Add Pointer::NULL as a constant Pointer nullPointer = new Pointer(runtime, pointerClass, new NullMemoryIO(runtime)); pointerClass.setConstant("NULL", nullPointer); runtime .getNilClass() .addMethod("to_ptr", new NilToPointerMethod(runtime.getNilClass(), nullPointer)); return pointerClass; }