This is xnu-11215.1.10. See this file in:
#ifndef TESTS_INTRUSIVE_SHARED_PTR_ABI_HELPER_H
#define TESTS_INTRUSIVE_SHARED_PTR_ABI_HELPER_H
#include <libkern/c++/intrusive_shared_ptr.h>
#include <darwintest.h>
#include "test_policy.h"
struct T { int i; };
#if defined USE_SHARED_PTR
template <typename T>
using SharedPtr = libkern::intrusive_shared_ptr<T, test_policy>;
#else
template <typename T>
using SharedPtr = T *;
#endif
extern SharedPtr<T> return_shared_as_raw(T*);
extern SharedPtr<T> return_raw_as_shared(T*);
#endif // !TESTS_INTRUSIVE_SHARED_PTR_ABI_HELPER_H