boost/boost/mpl/placeholders.hpp

   1
   2 #if !defined(BOOST_PP_IS_ITERATING)
   3
   4 ///// header body
   5
   6 #ifndef BOOST_MPL_PLACEHOLDERS_HPP_INCLUDED
   7 #define BOOST_MPL_PLACEHOLDERS_HPP_INCLUDED
   8
   9 // + file: boost/mpl/placeholders.hpp
  10 // + last modified: 25/feb/03
  11
  12 // Copyright (c) 2001-03
  13 // Peter Dimov, Aleksey Gurtovoy
  14 //
  15 // Permission to use, copy, modify, distribute and sell this software
  16 // and its documentation for any purpose is hereby granted without fee,
  17 // provided that the above copyright notice appears in all copies and
  18 // that both the copyright notice and this permission notice appear in
  19 // supporting documentation. No representations are made about the
  20 // suitability of this software for any purpose. It is provided "as is"
  21 // without express or implied warranty.
  22 //
  23 // See http://www.boost.org/libs/mpl for documentation.
  24
  25 #if !defined(BOOST_MPL_PREPROCESSING_MODE)
  26 #   include "boost/mpl/arg.hpp"
  27 #endif
  28
  29 #include "boost/mpl/aux_/config/use_preprocessed.hpp"
  30
  31 #if !defined(BOOST_MPL_NO_PREPROCESSED_HEADERS) \
  32  && !defined(BOOST_MPL_PREPROCESSING_MODE)
  33
  34 #   define BOOST_MPL_PREPROCESSED_HEADER placeholders.hpp
  35 #   include "boost/mpl/aux_/include_preprocessed.hpp"
  36
  37 #else
  38
  39 #   include "boost/mpl/aux_/config/nttp.hpp"
  40 #   include "boost/mpl/limits/arity.hpp"
  41 #   include "boost/preprocessor/iterate.hpp"
  42 #   include "boost/preprocessor/cat.hpp"
  43
  44 namespace boost {
  45 namespace mpl {
  46
  47 // watch out for GNU gettext users, who #define _(x)
  48 #if !defined(_) || defined(BOOST_MPL_NO_UNNAMED_PLACEHOLDER_SUPPORT)
  49 typedef arg<-1> _;
  50
  51 namespace placeholders {
  52 using boost::mpl::_;
  53 }
  54 #endif
  55
  56 //: agurt, 17/mar/02: one more placeholder for the last 'apply#'
  57 //: specialization
  58 #define BOOST_PP_ITERATION_PARAMS_1 \
  59     (3,(1, BOOST_MPL_METAFUNCTION_MAX_ARITY + 1, "boost/mpl/placeholders.hpp"))
  60 #include BOOST_PP_ITERATE()
  61
  62 } // namespace mpl
  63 } // namespace boost
  64
  65 #endif // BOOST_MPL_USE_PREPROCESSED_HEADERS
  66 #endif // BOOST_MPL_PLACEHOLDERS_HPP_INCLUDED
  67
  68 ///// iteration
  69
  70 #else
  71 #define i BOOST_PP_FRAME_ITERATION(1)
  72
  73 typedef arg<i> BOOST_PP_CAT(_,i);
  74
  75 namespace placeholders {
  76 using boost::mpl::BOOST_PP_CAT(_,i);
  77 }
  78
  79 #undef i
  80 #endif // BOOST_PP_IS_ITERATING