title: How to build this c++ typelist into a variant?
body: <p>Here,</p>
  
  <p><a href="https://stackoverflow.com/questions/2150618/how-do-i-fix-this-c-typelist-template-compile-error">how do I fix this c++ typelist template compile error?</a></p>
  
  <p>we built a typelist, using the code from modern c++ design.</p>
  
  <p>Question is now -- how do I take this and built it into a variant class?</p>