[Agora] get an Agora_ Example usage of refptr object

• Get the reference count object

agora_refptr Is a template class based on reference count

• Similar to the common auto_ptr usage .

• Built in an object pointer

 protected:
  T* ptr_;

• agora_refptr Tectonically Yes ptr_ do add ref
• get Return the object directly
• agora_refptr Destruct and go reset fall ptr_

  void reset() { 
    
    if (ptr_) { 
    
      ptr_-></