The BOOST_PP_TUPLE_POP_FRONT macro
      pops an element from the beginning of a tuple.
    Usage
     BOOST_PP_TUPLE_POP_FRONT(
tuple) 
(v) 
    Arguments
    
      - tuple
-  The tuple to pop an element from.
Remarks
     This macro returns tuple after removing the first
      element.  If tuple has only a single element, it remains
      unchanged since a tuple must have at least one element.
     This macro uses BOOST_PP_REPEAT internally.  Therefore,
      to use the z parameter passed from other macros that use BOOST_PP_REPEAT,
      see BOOST_PP_TUPLE_POP_FRONT_Z 
    See Also
    
    Requirements
    
    Sample Code
    
    
     © Copyright Edward Diener 2013