c++ - What does *(void **) mean? -

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मैंने कार्यक्रम में एक वाक्य देखा 

  शून्य * tmp = ... tmp = * (शून्य **) ptr2;   
 इस वाक्य का क्या मतलब है?   
 
 
  टीएमपी = * (शून्य **) ptr2;   
 चलो इसे एक समय में एक कदम उठाते हैं।  
  शून्य *   
 यह संकेतक से शून्य है   शून्य   
 यह सूचक-से-पॉइंटर-टू-वायड है।  
  (शून्य * *) ptr2;   
 जो भी  ptr2  है, उसे पॉइंटर-टू-पॉइंटर-टू-वाइड में डालें।  
  * (शून्य * *) ptr2;   
 पॉइंटर-टू-पॉइंटर-टू-वायड को दो-संदर्भ दें, पॉइंटर-टू-वायड प्रदान करें।  
  tmp = * (शून्य * *) ptr2;   
  tmp  से पॉइंटर-टू-वायड असाइन करें।

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