title: Error: use of non-static data member
body: <p><a href="https://i.stack.imgur.com/cb0jQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cb0jQ.png" alt="enter image description here"></a></p>
  
  <p>This is the code in my class.h file that is causing me the problem. For some reason my functor can't access the master vector by giving me 10 counts of this error (1 for each use of master in the functor): </p>
  
  <p><a href="https://i.stack.imgur.com/gK0tY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gK0tY.png" alt="enter image description here"></a></p>
  
  <p>Any help would be wonderful, I have no idea how to fix this.</p>