text: 
  // Copyright Aleksey Gurtovoy 2000-2004
  //
  // Distributed under the Boost Software License, Version 1.0. 
  // (See accompanying file LICENSE_1_0.txt or copy at 
  // http://www.boost.org/LICENSE_1_0.txt)
  //
  
  // *Preprocessed* version of the main "set.hpp" header
  // -- DO NOT modify by hand!
  
  namespace boost { namespace mpl {
  
  template<
        typename T0 = na, typename T1 = na, typename T2 = na, typename T3 = na
      , typename T4 = na, typename T5 = na, typename T6 = na, typename T7 = na
      , typename T8 = na, typename T9 = na, typename T10 = na, typename T11 = na
      , typename T12 = na, typename T13 = na, typename T14 = na
      , typename T15 = na, typename T16 = na, typename T17 = na
      , typename T18 = na, typename T19 = na
      >
  struct set;
  
  template<
       
      >
  struct set<
            na, na, na, na, na, na, na, na, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set0<  >
  {
      typedef set0<  >::type type;
  };
  
  template<
        typename T0
      >
  struct set<
            T0, na, na, na, na, na, na, na, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set1<T0>
  {
      typedef typename set1<T0>::type type;
  };
  
  template<
        typename T0, typename T1
      >
  struct set<
            T0, T1, na, na, na, na, na, na, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set2< T0,T1 >
  {
      typedef typename set2< T0,T1 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2
      >
  struct set<
            T0, T1, T2, na, na, na, na, na, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set3< T0,T1,T2 >
  {
      typedef typename set3< T0,T1,T2 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3
      >
  struct set<
            T0, T1, T2, T3, na, na, na, na, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set4< T0,T1,T2,T3 >
  {
      typedef typename set4< T0,T1,T2,T3 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      >
  struct set<
            T0, T1, T2, T3, T4, na, na, na, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set5< T0,T1,T2,T3,T4 >
  {
      typedef typename set5< T0,T1,T2,T3,T4 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5
      >
  struct set<
            T0, T1, T2, T3, T4, T5, na, na, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set6< T0,T1,T2,T3,T4,T5 >
  {
      typedef typename set6< T0,T1,T2,T3,T4,T5 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, na, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set7< T0,T1,T2,T3,T4,T5,T6 >
  {
      typedef typename set7< T0,T1,T2,T3,T4,T5,T6 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, na, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set8< T0,T1,T2,T3,T4,T5,T6,T7 >
  {
      typedef typename set8< T0,T1,T2,T3,T4,T5,T6,T7 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, na, na, na, na, na, na, na, na
          , na, na, na
          >
      : set9< T0,T1,T2,T3,T4,T5,T6,T7,T8 >
  {
      typedef typename set9< T0,T1,T2,T3,T4,T5,T6,T7,T8 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, na, na, na, na, na, na, na
          , na, na, na
          >
      : set10< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9 >
  {
      typedef typename set10< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, na, na, na, na, na, na
          , na, na, na
          >
      : set11< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10 >
  {
      typedef typename set11< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, na, na, na, na
          , na, na, na, na
          >
      : set12< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11 >
  {
      typedef typename set12< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11, typename T12
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, na, na, na
          , na, na, na, na
          >
      : set13< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12 >
  {
      typedef typename set13< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11, typename T12, typename T13
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, na, na
          , na, na, na, na
          >
      : set14< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13 >
  {
      typedef typename set14< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11, typename T12, typename T13, typename T14
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, na
          , na, na, na, na
          >
      : set15<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          >
  {
      typedef typename set15< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11, typename T12, typename T13, typename T14
      , typename T15
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15, na, na, na, na
          >
      : set16<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15
          >
  {
      typedef typename set16< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14,T15 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11, typename T12, typename T13, typename T14
      , typename T15, typename T16
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15, T16, na, na, na
          >
      : set17<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15, T16
          >
  {
      typedef typename set17< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14,T15,T16 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11, typename T12, typename T13, typename T14
      , typename T15, typename T16, typename T17
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15, T16, T17, na, na
          >
      : set18<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15, T16, T17
          >
  {
      typedef typename set18< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14,T15,T16,T17 >::type type;
  };
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11, typename T12, typename T13, typename T14
      , typename T15, typename T16, typename T17, typename T18
      >
  struct set<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15, T16, T17, T18, na
          >
      : set19<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15, T16, T17, T18
          >
  {
      typedef typename set19< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14,T15,T16,T17,T18 >::type type;
  };
  
  /// primary template (not a specialization!)
  
  template<
        typename T0, typename T1, typename T2, typename T3, typename T4
      , typename T5, typename T6, typename T7, typename T8, typename T9
      , typename T10, typename T11, typename T12, typename T13, typename T14
      , typename T15, typename T16, typename T17, typename T18, typename T19
      >
  struct set
      : set20<
            T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
          , T15, T16, T17, T18, T19
          >
  {
      typedef typename set20< T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12,T13,T14,T15,T16,T17,T18,T19 >::type type;
  };
  
  }}
  
  