--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Analysis/os_smart_ptr.h	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,88 @@
+#ifndef _OS_SMART_POINTER_H
+#define _OS_SMART_POINTER_H
+
+#include "os_object_base.h"
+
+namespace os {
+
+template<class T>
+struct smart_ptr {
+  smart_ptr() : pointer(nullptr) {}
+
+  explicit smart_ptr(T *&p) : pointer(p) {
+    if (pointer) {
+      _retain(pointer);
+    }
+  }
+
+  smart_ptr(smart_ptr const &rhs) : pointer(rhs.pointer) {
+    if (pointer) {
+      _retain(pointer);
+    }
+  }
+
+  smart_ptr & operator=(T *&rhs) {
+    smart_ptr(rhs).swap(*this);
+    return *this;
+  }
+
+  smart_ptr & operator=(smart_ptr &rhs) {
+    smart_ptr(rhs).swap(*this);
+    return *this;
+  }
+
+  ~smart_ptr() {
+    if (pointer) {
+      _release(pointer);
+    }
+  }
+
+  void reset() {
+    smart_ptr().swap(*this);
+  }
+
+  T *get() const {
+    return pointer;
+  }
+
+  T ** get_for_out_param() {
+    reset();
+    return &pointer;
+  }
+
+  T * operator->() const {
+    return pointer;
+  }
+
+  explicit
+  operator bool() const {
+    return pointer != nullptr;
+  }
+
+  inline void
+  swap(smart_ptr &p) {
+    T *temp = pointer;
+    pointer = p.pointer;
+    p.pointer = temp;
+  }
+
+  static inline void
+  _retain(T *obj) {
+    obj->retain();
+  }
+
+  static inline void
+  _release(T *obj) {
+    obj->release();
+  }
+
+  static inline T *
+  _alloc() {
+    return new T;
+  }
+
+  T *pointer;
+};
+} // namespace os
+
+#endif /* _OS_SMART_POINTER_H */