vlt.matlab.isclassfile

  ISCLASSFILE - Is a Matlab .m file a class definition?

  B = ISCLASSFILE(FILENAME)

  Returns 1 if FILENAME is a Matlab class definition file.
  Returns 0 otherwise.

  Uses an undocumented Matlab function MTREE. MTREE's behavior may change
  in future releases.

  Derived from comments in this nice blog note:
   https://blogs.mathworks.com/loren/2013/08/26/what-kind-of-matlab-file-is-this/

  Note: EXIST(FILENAME,'CLASS') did not work for my custom objects

  See also: vlt.matlab.isfunctionfile

  Example: 
    wfilename = which('table')
    b = vlt.matlab.isclassfile(wfilename)