The BOOST_PP_TUPLE_REMOVE_D macro
      removes an element from a tuple.  It reenters BOOST_PP_WHILE
      with maximum efficiency. 
    Usage
     BOOST_PP_TUPLE_REMOVE_D(
d, 
tuple,
      
i) 
(v) 
    Arguments
    
      - d
-  The next available BOOST_PP_WHILE iteration. 
- tuple
-  The tuple from which an element is to be removed. 
- i
-  The zero-based position in tuple of the element to be
        removed.  Valid values range from 0 to BOOST_PP_TUPLE_SIZE(tuple)
        - 1. If tuple has only a single element, it remains
        unchanged since a tuple must have at least one element.
See Also
    
    Requirements
    
    
     © Copyright Edward Diener 2013