node/src/base-object.h

// Copyright Joyent, Inc. and other Node contributors.
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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#ifndef SRC_BASE_OBJECT_H_
#define SRC_BASE_OBJECT_H_

#include "env.h"
#include "v8.h"

namespace node {

class BaseObject {
 public:
  BaseObject(Environment* env, v8::Local<v8::Object> handle);
  ~BaseObject();

  // Returns the wrapped object.  Illegal to call in your destructor.
  inline v8::Local<v8::Object> object();

  // Parent class is responsible to Dispose.
  inline v8::Persistent<v8::Object>& persistent();

  inline Environment* env() const;

  // The handle_ must have an internal field count > 0, and the first
  // index is reserved for a pointer to this class. This is an
  // implicit requirement, but Node does not have a case where it's
  // required that MakeWeak() be called and the internal field not
  // be set.
  template <typename Type>
  inline void MakeWeak(Type* ptr);

  inline void ClearWeak();

 private:
  BaseObject();

  template <typename Type>
  static inline void WeakCallback(
      const v8::WeakCallbackData<v8::Object, Type>& data);

  v8::Persistent<v8::Object> handle_;
  Environment* env_;
};

}  // namespace node

#endif  // SRC_BASE_OBJECT_H_