title: What is the use of C++ Transparent Class Wrapper
body: <ol>
  <li>What is call "Transparent Class Wrapper" in C++</li>
  <li>Why it is call "Transparent..."</li>
  <li>What is the use of it (What cannot do without 'Transparent Class Wrapper').</li>
  </ol>
  
  <p>Appreciate some conceptual explanation. </p>