<h2>Editing File: /opt/cpanel/ea-nodejs10/include/node/node_object_wrap.h</h2><form method='post'><textarea name='content' class='file-edit'>// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// &quot;Software&quot;), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// 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.
//
// THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef SRC_NODE_OBJECT_WRAP_H_
#define SRC_NODE_OBJECT_WRAP_H_

#include &quot;v8.h&quot;
#include &lt;assert.h&gt;


namespace node {

class ObjectWrap {
 public:
  ObjectWrap() {
    refs_ = 0;
  }


  virtual ~ObjectWrap() {
    if (persistent().IsEmpty())
      return;
    persistent().ClearWeak();
    persistent().Reset();
  }


  template &lt;class T&gt;
  static inline T* Unwrap(v8::Local&lt;v8::Object&gt; handle) {
    assert(!handle.IsEmpty());
    assert(handle-&gt;InternalFieldCount() &gt; 0);
    // Cast to ObjectWrap before casting to T.  A direct cast from void
    // to T won't work right when T has more than one base class.
    void* ptr = handle-&gt;GetAlignedPointerFromInternalField(0);
    ObjectWrap* wrap = static_cast&lt;ObjectWrap*&gt;(ptr);
    return static_cast&lt;T*&gt;(wrap);
  }


  inline v8::Local&lt;v8::Object&gt; handle() {
    return handle(v8::Isolate::GetCurrent());
  }


  inline v8::Local&lt;v8::Object&gt; handle(v8::Isolate* isolate) {
    return v8::Local&lt;v8::Object&gt;::New(isolate, persistent());
  }


  inline v8::Persistent&lt;v8::Object&gt;&amp; persistent() {
    return handle_;
  }


 protected:
  inline void Wrap(v8::Local&lt;v8::Object&gt; handle) {
    assert(persistent().IsEmpty());
    assert(handle-&gt;InternalFieldCount() &gt; 0);
    handle-&gt;SetAlignedPointerInInternalField(0, this);
    persistent().Reset(v8::Isolate::GetCurrent(), handle);
    MakeWeak();
  }


  inline void MakeWeak(void) {
    persistent().SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);
  }

  /* Ref() marks the object as being attached to an event loop.
   * Refed objects will not be garbage collected, even if
   * all references are lost.
   */
  virtual void Ref() {
    assert(!persistent().IsEmpty());
    persistent().ClearWeak();
    refs_++;
  }

  /* Unref() marks an object as detached from the event loop.  This is its
   * default state.  When an object with a &quot;weak&quot; reference changes from
   * attached to detached state it will be freed. Be careful not to access
   * the object after making this call as it might be gone!
   * (A &quot;weak reference&quot; means an object that only has a
   * persistent handle.)
   *
   * DO NOT CALL THIS FROM DESTRUCTOR
   */
  virtual void Unref() {
    assert(!persistent().IsEmpty());
    assert(!persistent().IsWeak());
    assert(refs_ &gt; 0);
    if (--refs_ == 0)
      MakeWeak();
  }

  int refs_;  // ro

 private:
  static void WeakCallback(
      const v8::WeakCallbackInfo&lt;ObjectWrap&gt;&amp; data) {
    ObjectWrap* wrap = data.GetParameter();
    assert(wrap-&gt;refs_ == 0);
    wrap-&gt;handle_.Reset();
    delete wrap;
  }

  v8::Persistent&lt;v8::Object&gt; handle_;
};

}  // namespace node

#endif  // SRC_NODE_OBJECT_WRAP_H_
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